All online calculators

• Life

  • Calendar

    • 365 days calendar date to Gregorian date The calculator converts a date in 365 days calendar (Armenian, Ancient Egyptian) to a date in Gregorian calendar

      Ahargana day count to the Gregorian date The calculator converts heap of day since the Kali Yuga beginning day to the Gregorian date

      Armenian calendar This calculator converts a date to an Armenian calendar date and vice versa.

      Coptic calendar These calculators convert dates between Gregorian and Coptic calendar systems.

      Days between dates. The historical version. Calculates number of days between two dates taking in account the date of transition to Gregorian calendar.

      Ethiopian calendar The calculator converts an Ethiopian date to Gregorian date and vice versa.

      Fixed date to Gregorian date The calculator evaluates the Gregorian date from the fixed date (integer number passed from the beginning of 1.01.01.

      Gregorian date to Hindu mean lunisolar calendar The calculator shows the Hindu mean lunisolar calendar date for an input Gregorian date

      Gregorian date to Hindu mean solar calendar The calculator shows the Hindu mean solar calendar date for an input Gregorian date

      Gregorian date to Julian date The calculator converts a Gregorian date to a Julian date

      Gregorian date to the Ahargana day count The calculator gives number of days since the Kali Yuga beginning.

      Gregorian to fixed date Auxiliary calculator for other date conversion calculators. By Calendrical calculations of Dershowitz and Reingold.

      Hindu mean lunisolar calendar to Gregorian date The calculator converts the Hindu mean lunisolar calendar date to the Gregorian date.

      Hindu mean solar calendar to Gregorian date The calculator converts the Hindu mean solar calendar date to the Gregorian date.

      ISO calendar The calculator converts ISO date to Gregorian date and vice versa.

      Indian calendars The calculators for Hindu date conversions

      Orthodox Easter date calculator Using a modification of the Gauss algorithm to calculate Orthodox Easter date

      Roman calendar The calculators convert dates between Ancient Roman Calendar and Gregorian calendars

      Week days calculator The calculator counts the number of week days between two selected dates.

  • Date and Time

    • Activity Time Summarizer This calculator is designed to summarize and total time for different activities entered into a table.

      Age Calculator This online calculator determines the amount of time that has elapsed between a specific date and the current moment.

      Ancient Egyptian Calendar The calculator converts an Ancient Egyptian date to Gregorian date and vice versa.

      Azimuth and solar elevation angle Calculation of azimuth and solar elevation angle by given the coordinates and time of observation. It's possible to input coordinates manually or by selecting from the directory of cities.

      City Timezone Converter This calculator allows you to quickly and easily find out the current time in any city in the world and the time difference between two cities.

      Clean & Sober Time Tracker The Sobriety Clock calculator is a powerful tool designed to track and display your journey of sobriety with remarkable precision.

      Convert days to years, months, and days This calculator converts a number of days to a number of years, months, and days in the month.

      Date Interval Calculator The calculator allows the user to add or subtract a specified time interval in days, hours, minutes, and seconds to a specified date and return two dates: the date plus the interval and the date minus the interval.

      Date and number of working days (for Russia) Calculator calculates the date of the initial date and the number of working days. Taking into account weekends, holidays and weekend shifts at work days, according to the published decrees of the government of the Russian Federation. Created by user's request.

      Date by the Julian Day Number Displays Gregorian calendar date corresponding to Julian Day Number

      Date calculator Date plus or minus date parts (years, months, days, weeks, hours, minutes, seconds), time zone conversion.

      Date plus days This online calculator adds or subtracts a given number of days to or from a given date.

      Date to timestamp converter This calculator converts the date to epoch timestamp in milliseconds, that is, milliseconds since standard epoch of 1/1/1970, as used, for example, in JavaScript.

      Date weeks out or before This online calculator adds or subtracts given number of weeks to or from a given date.

      Day of the week for a given date This online calculator shows the day of the week for a given date

      Daylight saving time The calculator determines the nearest DST transition dates for a given date. It also displays the time transition history for a given time zone.

      Days count in several date spans The calculator gives total number of days in date span list. Each date span is defined by start date and end date. The calculator can exclude multiple date date span intersections.

      Dynamical Time difference The calculator plots TD time difference approximation for given time period

      Equation of time The calculator plots the equation of time - the difference between apparent solar time and the mean solar time. It also draws the two components: the orbit eccentricity effect and the obliquity effect.

      Gregorian calendar. Julian calendar. The calendar eras. The calculator converts Julian calendar date to Gregorian calendar date taking in account the calendar era.

      Gregorian date to 365 days calendar The calculator converts Gregorian date to the 365 day calendar date. The calendar has 12 months with 30 days each and 1 month with 5 days.

      Hebrew calendar The calculator converts dates from Hebrew calendar to Gregorian and vice versa.

      How many days are there between two dates? This day calculator counts the number of days between two dates. It does not include the last day, so, there is 1 day between today and tomorrow, not 2.

      How many hours between two days This calculator helps you calculate how many hours between two days, for example, between Monday 8 a.m and Wednesday, 6 p.m.

      How many months are there between two dates? This online calculator calculates how many months are there between two dates.

      How many weeks are between two dates? This week calculator determines the number of weeks between the first date and second date.

      How many workdays between two dates? The calculator evaluates number of working days and holidays for a period of time. The calculator based on the U.S. federal holidays table recognised in most states.

      How much time between two dates? This calculator determines how much time, in days, hours, minutes and seconds, elapsed between the first date and the second date

      Issue number generator Issue Number Generator for unnumbered magazines & comics & newspapers. If magazine did not print issue numbers, only dates, it can number them all, f.e. all Sundays starting with specified date up to specified date

      Jarvis march This online calculator computes the convex hull of a given set of points using Jarvis march algorithm, aka Gift wrapping algorithm

      Julian and Gregorian calendars Julian and Gregorian calendars date conversion

      Julian days calculation Calculation of the Julian day for a given date, plus some information.

      Length of service calculation Length of service calculation for several periods of work

      Mayan calendar, 2012, the end of the world. About 2012, the end of the world and Maya

      Monthly issue number generator Issue Number Generator for unnumbered magazines & comics & newspapers. If magazine did not print issue numbers, only months, it can number them all, f.e. all months starting with specified date up to specified date

      Moonphases Moon's age and phase calculation

      Number of Days in a Year Calculator Determine the number of days in a given year, taking into account leap years.

      Old Russian (Byzantine) system of chronology Old Russian calendar - Years are counted since the creation of the world

      Release Date Countdown gadget This calculator allows you to configure the release date or event you want to track and use it as countdown gadget via new "Sharing" functionality

      Russian Working Days Calculator The Working Days Calculator calculates the number of working days between two entered dates, excluding weekends and holidays in accordance with the published decrees of the government of the Russian Federation.

      Russian non-working days The calculator displays official day offs for the current year and the weekends adjacent to them. The calculator takes into account weekends shifts according to Russian Federation Government Decrees.

      Sun position at a given date. Azimuth and elevation table. Calculation of azimuth and elevation of the sun above the horizon for a given position and time. Table with one hour increments.

      Sunrise and sunset calculator Sunrise/Sunset calculation for given latitude and longitude or for given city. Source: Almanac for Computers, 1990 published by Nautical Almanac Office United States Naval ObservatoryWashington, DC 20392

      The Muslim calendar. The Gregorian calendar conversion The Muslim calendar. The Gregorian calendar conversion

      Time Converter This calculator allows users to enter time in various units such as days, hours, minutes and seconds in any combination and then normalizes the value into days, hours, minutes and seconds. The calculator also displays the entered time in other units such as hours plus minutes plus seconds, minutes plus seconds, and seconds only.

      Time Interval Calculator This calculator allows you to easily add and manage time intervals in a table, using the hours:minutes:seconds format. Whether you're tracking work hours, recording running times, or measuring any other type of elapsed time, this calculator can help.

      Time Span Calculator This online calculator computes how much time is passed between two time points, specified in hours and minutes. But, unlike others, it computes several values - including time span over midnight.

      Time between two dates with time zone To calculate number of days, hours, minutes and seconds between two dates with time zones.

      Time difference The calculator gives a time difference in hours or minutes between two selected time zones for the current date and time.

      Time interval between two dates Calculate time interval between two dates

      Time percentage The calculator converts time to percent and vice versa.

      Time scales This calculator represents time in different time scales.

      Time to Earn Calculator: Calculate Work Hours for Desired Income This online calculator helps estimate the duration required to earn a specific amount based on your hourly rate.

      Time. Total sum Calculator sums up input time intervals

      Timeline Midnight Converter This calculator accepts the length of a period, as well as the length of the whole timeline. It then converts the length of the period into minutes to midnight, related to the whole timeline as if it took place over the course of a single day.

      Timer This online calculator calculates how much time has passed since specified date and time down to the second.

      Timesheet report This online calculator allows you to add work start time / end time records, parses them and calculates the total time

      Tips and tricks #14: How to use a masked input This article describes how to use a masked input in your calculators

      Total time calculator This calculator is useful for fast time addition, you just enter time entries in hh mm ss format and the calculator gives you the sum of there time entries

      Travel Duration This online calculator computes travel duration given departure time and city and arrival time and city using time zones information

      Week Number Calculator Calculate the week number of a given date using the Week Number Calculator. This versatile tool offers four different methods of calculation to determine the week number based on your preferences.

      Weeks to Months Calculator This online calculator converts a given number of weeks to months using an average estimate based on 30.416 days per month.

      Weeks to months This online calculator converts given number of weeks to approximate number of months and days in the month

      World Time Calculator This calculator allows you to see the current time in various cities and locations around the world, or to convert a specific date and time for your own location into the corresponding time in other cities. It takes into account the time zone differences between locations and factors in daylight saving time where applicable.

      World Time Converter The calculator displays the current time on your PC, as well as the corresponding UTC time based on the time zone on your PC. Additionally, the user can choose any city and the calculator will display the current time in that city.

  • Health

    • Body Proportions Calculator This calculator calculates the grace index of a person's figure based on their chest, waist, hip, and thigh measurements.

      Body fat calculator - YMCA formula This calculator uses weight and waist measurements to calculate body fat percentage with YMCA formula.

      Body proportionality Calculates the body proportionality by several body parameters

      Brunhard's formula ideal weight calculator Another ideal weight formula from the Internet - Brunhard's formula. It requires the knowledge of chest circumference. According to the formula, ideal weight equals height multiplied by chest circumference and divided by 240.

      Coronavirus disease epidemic in different countries The calculator compares the coronavirus disease 2019 pandemic development in different countries aligned by number of days since the epidemic beginning in the particular country.

      Daily Calorie Rate Calculator of the daily calorie rate, taking into account the level of physical activity.

      Determination of the baby's sex It's unscientific, but it surprisingly works.

      Ideal Weight Calculator The Body Mass Index (BMI) calculator is used to calculate the ideal weight of an individual based on their height and weight.

      Ideal weight calculator using Paul Broca formula Ideal weight calculator using Paul Broca formula

      Lorenc Ideal Weight Calculator The calculator on the page is designed to estimate an individual's ideal weight based on their height. It uses the Lorenc formula, which is a widely used equation to calculate the estimated healthy weight range for a person based on their height.

      McDonald's meal nutrition facts Nutrition facts of McDonald's meals according to http://www.mcdonaldsmenu.info

      Nagler's Ideal Weight Calculator Nagler's formula is a method used to calculate an individual's ideal body weight based on their height, age, and gender.

      Pregnancy Due Date Predictor The pregnancy due date calculator is a helpful tool for expectant mothers who want to know when their baby is due to arrive.

      Proportional Body Calculator: McCallum's Formula Discover the concept of body proportionality with McCallum's Formula.

      Strength of alcoholic cocktail Calculates volume fraction of alcohol in a beverage made of 3 other beverages.

      The basal metabolic rate This calculator computes BMR calories

      The number of packs steroid you need for cycle The number of packs steroid you need for cycle

      Weathering of alcohol concentration in the blood Calculates the time needed for weathering of alcohol in the blood to a normal level

  • Others

    Adjusting picture/pixel sizes proportionally This online calculator adjusts the second dimension of a picture/video, given the new first dimension, keeping the original proportions

    Bill Splitter - Simplify Group Expenses with Ease Splitting bills in group settings—like dinners with friends, family gatherings, or team outings—can be tricky. Our intuitive Bill Splitter calculator eliminates the guesswork! Divide expenses equally, by percentages, fixed amounts, or custom shares, while accounting for individual extras (e.g., personal drinks). Perfect for restaurants, trips, or shared events, this tool ensures fairness in seconds. Enter your details below and let the calculator handle the math!

    Country Language Lookup The online calculator lists the languages spoken in a given country.

    Country code Returns country or territory name by ISO code

    Currency Explorer This online calculator is a currency reference tool that provides information on the currency used in a selected country as well as obsolete currencies. It displays the name, symbol, short symbol, and effective date of the currency for the selected country.

    Dart Score Calculator: Master 501, 301 & 301 Double-In Games Track your dart matches with precision using our Dart Score Calculator! Perfect for two-player games of 501, standard 301, or competitive 301 Double-In. Click the virtual dartboard to log throws (including special "BULL" and "BE" zones), use "MISS" for failed attempts, and "UNDO" to correct errors. Real-time scoring shows remaining points and suggests professional checkout paths.

    Distance Cost Calculator This calculator calculates the cost of travel by multiplying the distance traveled in kilometers (or miles) by the rate per kilometer (or mile).

    Gaming Raid Time Converter: Simplify Global Event Scheduling Coordinating in-game activities across different time zones presents a common challenge for international gaming teams. This tool converts server-based event schedules into localized times for each team member. Specify your game server's time zone and event time, add your team members' locations, and the converter automatically displays the equivalent local times for everyone.

    Glue Solution Calculator The Glue Solution Calculator is a handy tool that helps you calculate the exact amount of dry glue and water needed to make the glue solution of the desired strength.

    Hack Hack the three-digit code

    ICAO MRZ Check Digit This calculator calculates the check digit from the other digits/alphabetic characters in the entered series. The calculation is done according to the algorithm used by ICAO for machine readable travel documents. The description of the algorithm can be found below the calculator.

    In which country can I pay with my currency? Displays list of countries in which you can pay by the selected currency.

    Ingredients - Proportional Quantities Calculator The Ingredients - Proportional Quantities Calculator is a helpful tool for recalculating ingredient quantities based on given proportions. Whether you need to adjust ingredient quantities due to a change in one component or you want to utilize all remaining ingredients, this calculator simplifies the process.

    Kart Racing Heat Generator The kart racing heat grid generator is a tool designed to ensure that each racer tries each starting position/kart in random order during a kart racing event.

    Language Speakers by Country Calculator The Language Speakers by Country Calculator allows the user to select a language from a list and displays a table of countries where the selected language is spoken along with the number of speakers and the fraction of the total population.

    Latin Quote Generator This calculator provides a fun and educational tool for people to learn and explore famous Latin quotes.

    Map of France regions Simple image map of France regions to illustrate usage of SVG image maps

    Partial Skein Yarn Yardage Estimator If you knit or crochet, you’ve likely encountered leftover partial skeins of yarn. Knowing how much yarn remains helps plan future projects, but requires a bit of math. This tool estimates yardage quickly: weigh your partial skein, input the numbers below, and get an instant result. Note that this is an approximation; factors affecting accuracy are explained in the details below.

    Puppy Weight Calculator for Medium, Large and Very Large Breeds The calculator takes the age of a puppy in months and its breed, either medium, large, or very large, and calculates the recommended weight in kilograms and as a percentage of the adult dog's weight.

    Shoe size comparison This calculator converts european shoe size to its english and US counterparts.

    Time to money converter This online calculator estimates how much your time is worth given your hourly rate

    Tips and tricks #13: Bitmaps and Pixel manipulation This article describes how to write calculators for an image manipulation

    USA Full Retirement Date Calculator Based on your birthday, this online calculator calculates your full retirement date, the first month you will be eligible for full Social Security retirement benefits, and the month you can apply for them.

• Professional

  • Computers

    • Ancient PixelArt: CompuServe RLE file viewer This online calculator can parse and display images from CompuServe graphics files in RLE format

      Audio Tone Generator Calculator A waveform and frequency tone generator calculator with adjustable parameters such as frequency, amplitude, waveform type, and file format output.

      Audio file waveform The calculator displays the waveform of the input audio file fragment.

      Automated Vigenère cipher decoder This online calculator provides aid in finding Vigenère cipher key if you can guess part of the encrypted text. It just automates some routine calculations, which you would perform manually otherwise.

      Base 64 encoding and decoding The calculators encode string to base64 string and decode back to original string. Special characters (+/) , generally produced by base64 algorithm, can be replaced by the data provided in additional parameter.

      Binary file You may use this calculator to create binary file by editing its content in hexadecimal, decimal or binary form.

      Bit length The calculator counts number of bits required to represent a number in the binary form. It also displays an input number in binary, octal, decimal, and hex forms.

      CSV to JSON Mapping Tool The calculator converts CSV table to JSON array of objects using a given map of CSV columns to object property names, and allows the user to paste CSV contents, tweak field separators, and replace empty strings with nulls in the JSON.

      Caesar cipher Calculator encrypts entered text by using Caesar cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

      Check Digit Mod 11 (ISBN-10 check digit) This online calculator generates and validates check digit with mod11 algorithm, used by ISBN-10

      Conditional entropy This online calculator calculates entropy of Y random variable conditioned on X random variable and X random variable conditioned on Y random variable given a joint distribution table (X, Y) ~ p

      Conversion of fractional numbers between numeral systems This online calculator helps to convert fractional number in one numeral system to fractional number in other numeral system.

      Count the number of words The calculator counts word number in a given text. It can be used for rough calculation of translation cost. Can be used for word number calculation in software resources.

      Decision tree builder This online calculator builds a decision tree from a training set using the Information Gain metric

      Email Finder The Email Finder calculator allows users to search for and extract email addresses from a block of text using a regular expression.

      GET Request String Parser The GET Request String Parser is a handy tool for breaking down HTTP GET request strings into parameter-value pairs and decoding URL-encoded sequences if necessary. By using this parser, you can easily extract and analyze the individual components of a GET request.

      Gray code converters These online calculators convert to and from the binary reflected in the Gray code and can produce a table for an n-bit Gray code

      H264 Maximum References Frames H264 Maximum References Frames

      HTML table to JSON array Th calculator converts the html table code to JSON array with optional data transpose and compression. It also visualizes numeric data on chart.

      Hartley Information Calculator The Hartley Information Calculator determines the amount of information contained in a message with length n using Hartley's formula.

      Huffman coding This online calculator generates Huffman coding based on a set of symbols and their probabilities. A brief description of Huffman coding is below the calculator.

      IP Address and Subnet Mask Calculator (IPv4) This online calculator determines subnet parameters for the given IP address and subnet mask

      Information gain calculator This online calculator calculates information gain, the change in information entropy from a prior state to a state that takes some information as given

      Integer to Other Numeral System Converter The "Integer to Numeral System Converter" calculator allows the user to convert an integer from decimal numeral system to any other positional numeral system.

      Joint Entropy This online calculator calculates joint entropy of two discrete random variables given a joint distribution table (X, Y) ~ p

      Keyboard layout and password Converts the word, typed in Russian letters into a set of symbols corresponding to these letters in English keyboard layout which is often used to create a Russian-speaking user passwords.

      LL1 grammar analysis. Yet another top-down parser generator. The calculator checks LL1 grammar correctness, parses a text using the grammar, shows FIRST, FOLLOW and FIRST PLUS sets, parsing tree and gives PLANETCALC parsing code.

      LZW This calculator compresses/decompresses a string using Lempel-Ziv-Welch (LZW) algorithm.

      Line Reverser The reverse line calculator is a simple tool that takes a block of text as input, breaks it into individual lines, and then reverses the order of the lines. This can be useful in a variety of situations where you need to quickly reverse the order of lines in a document or piece of code, such as when working with logs, scripts, or data files.

      Lines filter by number This online calculator filters lines of text by removing designated lines or, you can say, leaving only designated lines

      List Filter Calculator The list filter calculator allows users to apply multiple filters to an initial list of strings.

      List Join This online calculator can join two csv lists by key column the same way JOIN works in SQL (inner join, left outer join, right outer join)

      Log Summarizer This online calculator can be used to summarize lines of text, using regular expressions to extract a unique value from each line, such as a date or session ID.

      Numbered list maker This online calculator numbers lines of text

      Numeral System Converter The numeral system converter calculator converts numbers from one numeral system to another given the source number and the source numeral system base and target numeral system base. The calculator can handle numeral systems with bases ranging from 2 to 36.

      Palette generator This calculator generates palette of colors from starting color to ending color, using maximum diversity, "rainbow" style.

      Playfair cipher This online calculator encrypts and decrypts a message given Playfair cipher keyword. Non-alphabetic symbols (digits, whitespaces, etc.) are ignored.

      RAID arrays сalculator This calculators shows the possible variants of RAID arrays, based on the number of drives available.

      RGB-HSV Color Converter The RGB-HSV Color Converter allows the user to convert RGB color values to HSV color values and vice versa.

      Regular expression splitter is a tool that allows you to split a list of strings based on a regular expression pattern.

      Regular expression tester This online calculator allows user to experiment with regular expressions.

      Relative luminance and contrast ratio Two calculators evaluate the relative luminance and contrast ratio for given colors.

      Remove duplicates The calculator removes duplicates from an element list.

      Repeated Word Heatmap This calculator can help avoid unwanted word repetition in prose. It counts the number of occurrences of each word in the document, both globally, and within the "sliding window" distance before and after each word. It highlights the words which are used frequently near each other.

      Repeated Word Heatmap This calculator can help avoid unwanted word repetition in prose. It counts the number of occurrences of each word in the document, both globally, and within the "sliding window" distance before and after each word. It highlights the words which are used frequently near each other.

      Shannon Coding Calculator Generate Shannon coding for a set of symbols based on their probabilities.

      Shannon Entropy This online calculator computes Shannon entropy for a given event probability table and for a given message.

      Shannon-Fano coding calculator This online calculator generates Shannon-Fano coding based on a set of symbols and their probabilities

      Specific Conditional Entropy This online calculator calculates entropy of Y random variable conditioned on specific value of X random variable and X random variable conditioned on specific value of Y random variable given a joint distribution table (X, Y) ~ p

      String to list converter This online calculator splits string by regular expression and outputs the list of matches (or first matched group)

      Substitution cipher tool A tool to encrypt/decrypt messages with a simple substitution cipher given as the key. It is also useful for manual cryptanalysis of a substitution cipher - when you have a message written in the English alphabet partially decrypted with an automatic tool and want to tweak the key.

      Symbol Generator The random symbol generator is a simple tool that allows users to generate a specified number of symbols randomly selected from a given set of symbols. Users can choose the number of paragraphs and the number of symbols per paragraph to be generated.

      Text Filter with Regex This online calculator splits lines of text using a regular expression.

      Text Formatter The calculator is designed to reformat lines of text according to user specifications.

      Text compression using Huffman coding This online calculator compresses entered text using Huffman coding. It also displays built Huffman codes for the reference.

      Text file encoding You can use this calculators to encode a text with an encoding.

      The Discrete Fourier Transform Sandbox This calculator visualizes Discrete Fourier Transform, performed on sample data using Fast Fourier Transformation. By changing sample data you can play with different signals and examine their DFT counterparts (real, imaginary, magnitude and phase graphs)

      The Phone Number Extractor The phone number extractor calculator is a useful tool that extracts phone numbers from a large block of text.

      The Symbol Frequency Table Calculator The Symbol Frequency Table Calculator is a tool that takes in a text message and produces a table of the frequencies of each symbol (i.e., character) that appears in the message. The calculator can be customized to ignore spaces and/or case, allowing for a more accurate analysis of the message's symbol frequencies.

      URL Domain Name Frequency Calculator The calculator takes a list of URLs as input and extracts the domain name part from each URL. It then counts the number of occurrences for each unique domain name and displays the results in descending order.

      URL Unescape Calculator The calculator for URL decoding, also known as unescaping, takes a URL-encoded string and converts it back to its original form.

      Unicode scripts and blocks The calculators for counting number of characters per different Unicode blocks and Unicode scripts for a given text.

      Unique words count This calculator counts the number of unique words in a text (total number of words minus all word repetitions). It also counts a number of repeated words. It also can remove all the repetitions from the text.

      VARIANT DATE to datetime string This online calculator converts VARIANT DATE (double) value to datetime string.

      Vigenère cipher Calculator encrypts entered text by using Vigenère cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

  • Engineering

    • Albendazole 10% (veterinary). Calculation of the dose Albendazole is used to treat infections caused by worms.

      Air Flow Calibration This calculator is used to set the air flow rate through a grain bin equipped with an aeration fan. It assumes that the air flow can be controlled with baffles, spill gates or variable fan speed. It requires an air flow meter or anemometer. This calculator determines the air speed needed at the top collar of bin in order to achieve the desired air flow rate (CFM/bu Cubic Feet per Minute per bushel).

      Baffle Plate Gap Calculator Use this to determine the baffle plate gap in a tank based on your throat size. Measure bell end depth using something the same width as your baffle plate or enter a zero if there is no belled end.The drawing is looking from the top down.

      Barlow formula Barlow´s Formula is used to calculate the pipe pressure considering its diameter, wall thickness, and hoop stress (in the pipe material).

      Butterfly Damper Calculator Use this calculator to determine opening area of the damper.

      Calculating the parts given the ratio and total amount This online calculator finds part or whole measures of quantities using ratios

      Calculation of weight by volume Calculating the weight by the volume of material with matter density reference book

      Circular Intake/Exhaust Calculator Used to calculate opening area when a circular cover is pivoted over a circular opening.

      Coillator 3

      Cylinder Segment Volume Calculator: Find the Volume of a Cylindrical Segment This online calculator calculates the volume of a cylinder segment based on its dimensions and segment angle.

      Equilibrium moisture content The calculator gives the wood equilibrium moisture content by given temperature and relative humidity.

      Film calculator Calculation of the film segment duration in frames, hours, minutes, seconds.

      Flagstone Paving Calculator This online calculator estimates number of flagstones needed for paving

      Flow Rate and Pressure Drop of Gas Through a Pipeline Calculation of Flow rate of gas through a pipeline.

      Grain Drying with Natural Air Calculator to determine conditions for drying grain.

      Heat Index Calculator This calculator calculates the heat index or apparent temperature.

      Humindex This calculator calculates Humindex, index used by Canadian meteorologists to describe how hot the weather feels to the average person, by combining the effect of heat and humidity.

      Internal forces diagrams for the two-support beam The calculator draws the shear force and bending moment diagrams for a simply supported beam under various loads.

      Laminate flooring. The calculation of the number of planks The calculation of the number of planks requiered

      Liquid level in the tilted cylinder Сalculates the level of the liquid in a tilted cylindrical tank with the tank parameters and the liquid volume.

      Oval Tank Volume Calculator Find the volume of oval tanks in cubic inches and gallons.

      Pipe Wall Thickness Pipe wall thickness calculation using Barlow´s formula

      Power to the People Power units converter.

      Prueba2

      Relations between Mass, Length, Width, and Area Density of Fabric The Relations between Mass, Length, Width, and Area Density Calculator allows you to calculate various properties of fabric based on the given parameters. The available calculations include determining the mass, length, width, or area density of the fabric.

      Shipment weight Calculating the weight by the volume of shipment. Created by user's request.

      Square Door Tank Volume Use this calculator to determine tank volume if you've modified the tank for square doors.

      Square Stack Calculator Due to friction loss when using a rectangular stack, this will calculate the equivalent size of a round stack with the same airflow.

      Tank Volume Calculators Use one of these to determine your tank's volume.

      The amount of material for the mesh It's required to produce a mesh with predetermined length and width, roughly square meshes from tape with predetermined width. It is necessary to calculate the total length of the tape.

      Throat Calculator for Cylindrical Tanks Use this calculator to lay out the throat opening on a cylindrical tank, using the throat area from the Pit Calc.

      Throat Calculator for Overlapping Cylindrical Tanks Use this calculator to determine the throat cut-out when using two cylindrical tanks of the same or different diameter. The cut-out width will always be the same for both tanks. Enter the tank's diameter and the throat area from the Pit Calculator.

      Throat Calculators The Throat is the opening between the firebox and cook chamber. Enter the area given by the PitCalc and choose a shape that works best for your build.

      Tilted cylindrical tank volume Calculates volume of cylindrical tank tilted at an angle. To perform calculation you must provide the tank size, angle and liquid level.

      Trapezoid - Shaped Throat Opening Use this calculator to lay out a trapezoidal shaped throat cut-out. Enter the throat area from the PitCalc, your tank's diameter and dam height.

      Volume-to-Weight Converter This online calculator calculates the weight of a substance based on its volume and density.

      Wallpaper calculator Amount of cubic meters and amount of rolls of wallpaper as you enter the size of walls and the size of rolls

      Walls volume This construction calculator calculates volume of four walls of a rectangular building by building length, width, height and thickness of a walls

      Weight-to-Volume Calculator This calculator takes the weight of the substance in kilograms and allows you to choose the substance from a handbook of densities. It then calculates the volume of the substance and displays it in liters and cubic meters. Additionally, it shows the radius of the sphere in meters and the side of the cube in meters that the substance would form if it were compressed into those shapes.

  • Finance

    • Accrual-Based Compound Interest Calculator Get a Detailed View of Your Compound Interest with Our Accrual-Based Calculator

      Annuity Calculator This online calculator computes the annuity payment parameters, including the accreted amount and discounted value of rent.

      Bank card number validation The calculator checks a bank card number using Luhn algorithm, it also determines the card issuer according to Issuers handbook.

      Calculation of payments on corporate property tax Calculation of the tax amount and the amount of advance tax payments in accordance with Chapter 30 of the Russian Federation Tax Code

      Commission calculator This online calculator finds the commission from the sale price and the commission rate, the sale price from the commission and the commission rate, and the commission rate from the sale price and the commission

      Compound interest This calculator computes compound interest

      Compound interest at a certain number of days

      Compound interest with an equal monthly investment The calculation of the accumulated amount with the monthly investiment

      Cost per unit of volume This online calculator calculates cost per unit of volume (cubic unit) given length, width and height of a strip

      Discount calculator This online calculator finds the discount from the sale price and the usual price, the sale price from the discount and the usual price and the usual price from the sale price and the discount

      Effective Interest Rate Calculator This calculator calculates the effective interest rate for a given nominal interest rate and compounding frequency.

      Effective interest rate

      Family budget planner The calculator helps to plan personal finances.

      How much does cash weigh? The cache calculator gives the volume and weight of the cache in a currency.

      Inflation in Russia Calculator of Russian inflation since 1991 to the present time. Based on the data of the Federal State Statistics Service of the Russian Federation. The data updated weekly.

      Interest on the deposit and inflation

      Labor retirement pension amount (for Russia) Calculates labor retirement pension amount in accordance with the law.

      Loan payment example

      Mortgage calculator

      Mortgage loan early repayment date Calculates the repayment period of the mortgage loan with differentiated payments (Sberbank), depending on the size of the payment.

      Percentage This online calculator gives the percentage of the value. It also calculates the percentage of the sum (e.g. the income tax of the net salary) and the percentage of the difference (e.g. VAT of the gross amount).

      Price Comparison Per Square Meter Calculator This calculator helps to compare prices of different products of the same type by calculating their cost per square meter.

      Price based on running meter This online calculator calculates the price of certain area based on price of running or linear meter

      Progressive tax Calculates progressive tax according to tax rate table.

      Real interest rate using Fisher equation This online calculator calculates real interest rate from nominal interest rate with adjustment for inflation using Fisher equation

      Russian Central Bank Exchange Rate Converter The Russian Central Bank Exchange Rates Calculator is an online tool that allows users to convert between Russian rubles and other currencies. The calculator uses the official exchange rates of the Russian Central Bank to provide accurate and up-to-date currency conversion information.

      Simple Interest Calculates simple interest

      Simple Interest Daily Rate This calculator calculates the accreted amount given a number of days and simple interest rate. It uses three methods of calculations which differ from each other if the number of days is less than a year.

      Tax deductions from personal income tax This online calculator estimates tax deductions from personal income tax according the the laws of the Russian Federation.

      Tax-Adjusted Deal Profitability Calculator The deal profitability analysis calculator takes in the transaction details of a purchase and sale of a product, including the VAT amount paid on the purchase. Using this information, the calculator determines the income tax and VAT tax paid on the transaction, and calculates the profit amount after taxes are taken into consideration.

      The Central Bank of Russia exchange rate difference

      The calculation of amortization for tax purposes The methods and procedures for calculating amortization for tax purposes in accordance with Article 259 of the Tax Code, taking into account the changes to the federal law of 27 July 2006 N 144-FZ.

      USD to rubles and vice versa by the Central Bank of Russian Federation exchange rate This calculator converts an entered number to rubles or USD according to the Central Bank of Russia's current exchange rate, available as XML from the site of the Central Bank of the Russian Federation.

      Unused leave compensation at dismissal Calculates the payment of compensation for unused leave, envisaged by the labor legislation of the Russian Federation to the dismissal of an employee.

      When it becomes profitable to pay the tax as a sole proprietor in Russia? The calculator allows you to compare the taxes paid by an sole proprietor in the simplified taxation system and the individual.

  • Image processing

    • Box filters for image processing This online calculator allows you to process the image with the selected box filter, or use your own box filter.

      Color image to black and white image This online calculator converts color images to black and white images. Two options are possible: luminosity threshold or Floyd–Steinberg dithering.

      Color to Grayscale Conversion This online calculator converts color image to grayscale image using the luminosity method

      Digital images parameters comparison The calculator allows you to compare the parameters of different photographs saved in EXIF image data.

      Image Flip & Rotate This calculator allows you to perform simple image manipulation tasks online.

      Image color set The calculator counts the number of colors in an image, finds the dominant color, and creates a table of colors that make up the original image.

      Jpeg image meta-data The calculator displays meta-data stored in a jpeg file.

      Median filter This online calculator applies median filter to an image

      Morphological filters This online calculator can process the loaded image using one of the several morphological operators

      The Negative Image Calculator This online calculator creates captivating photo negatives by inverting the colors of your images.

      Watercolor Filter This online calculator applies a watercolor effect to an uploaded image by sequentially applying a median filter and a box filter sharpening.

  • Navigation

    • City objects observation The calculator helps to distinguish observed city objects.

      Compass Points The calculator gives name of compass point by direction angle in degrees.

      Compass point between two locations Given coordinates of two locations in decimal degrees, this calculator displays constant azimuth, distance and compass points for different compass roses.

      Compass, magnetic and true course calculator Calculates true, magnetic and compass direction (course, bearing) by a given direction, magnetic declination and deviation.

      Cost of one hour (or kilometer) Calculation of price per 1 kilometer by user request

      Course angle and the distance between the two points on loxodrome (rhumb line). Calculation of a distance on loxodrome (rhumb line) and course angle (azimuth) between two points with a given geographical coordinates.

      Course angles and distance between the two points on the orthodrome(great circle) Calculates the distance between two points of the Earth specified geodesic (geographical) coordinates along the shortest path - the great circle (orthodrome). Calculates the initial and final course angles and azimuth at intermediate points between the two given.

      Distance Calculator Calculate the distance between two geographic coordinates using the Haversine formula.

      Distance between two cities This online calculator measures the distance between two cities using latitude and longitude.

      Distance through the Earth This calculator calculates the distance from one point on the Earth to another point, going through the Earth, instead of going across the surface.

      Earth Distance Calculator The Earth Distance Calculator is a handy tool for measuring the distance between two points on the Earth's surface, as well as the distance between those two points if they were connected by a straight tunnel through the Earth's core.

      Earth Radius by Latitude (WGS 84) This online calculator calculates Earth radius at given latitude using WGS 84 reference ellipsoid

      Flag Semaphore Translator The calculator converts english phrase to the flag semaphore signal sequence, which can be used to communicate the phrase visually.

      Ford VIN decoder - Line information This calculator tries to extract car line information from supplied 5,6 and 7 positions of VIN number

      Fuel Consumption Calculator The Fuel Consumption Calculator takes in the distance traveled, tank capacity, average fuel consumption, and fuel price, and calculates the fuel consumption in liters or gallons, number of fuel tanks required, and cost of fuel.

      Fuel consumption Calculates fuel quantity consumed by car with given driving given distance.

      Points of the compass This online calculator outputs compass point given direction angle in degrees. Different compass roses (4, 8, 16, 32, 128-wind compass roses) are supported.

      Prospect distance from the ground and line of sight distance between two observers Calculates the prospect distance from height at observer and line of sight distance between two observers.

      Russia's regional registration plates This online calculator determines Russia's region from car plate.

      Tidal gate calculator (Rule of twelfths) This calculator calculates tidal gates using the rule of twelfths, estimating the height of the tide at any time, given only the time and height of high and low water.

  • Statistics

    • Analytical performance indicators Calculation of derived analytical indicators of time series

      Binomial distribution, probability density function, cumulative distribution function, mean and variance This calculator calculates probability density function, cumulative distribution function, mean and variance of a binomial distribution for given n and p

      Chande momentum oscillator indicator Description of Chande momentum oscillator indicator, drawing a graph on candles

      Cuba World Development Indicators 2016 - in memory of Fidel Castro This calculator provides access to 752 world development indicators for Cuba imported from World Bank data at 2016. In memory of Fidel Castro.

      Double exponential smoothing Description and example of the double exponential smoothing

      Events timeline This online calculator analyzes and summarizes sequence of events on a timeline. It calculates days passed between events, as well as statistical data, e.g. a mean time between events, a variance and a deviation

      Exponential Moving Average Exponential Moving Average calculation by candles

      Exponential smoothing Exponential smoothing theory

      Generator of random Russian first and last names and surnames with frequency of occurrence This online calculator generates a list of Russian surnames based on the frequency of occurrence of first and last names.

      Geometric Distribution. Probability density function, cumulative distribution function, mean and variance This calculator calculates geometric distribution pdf, cdf, mean and variance for given parameters

      Histogram Builder The Histogram Builder calculator allows users to input a set of numbers and generate a histogram, either by using the Sturgess, Scott or Freedman-Diaconis formula, or manually setting the number of groups.

      Histogram group number Sturges formula and other methods of determining the number of groups in histogram generation

      Hypergeometric Distribution. Probability density function, cumulative distribution function, mean and variance This calculator calculates hypergeometric distribution pdf, cdf, mean and variance for given parameters

      Indicators of variations Calculation of variation - the coefficient of variation, dispersion, mean square deviation, etc.

      Jaccard index The Jaccard index refers to binary similarity coefficients and is a commonly used measure for analyzing the species composition of communities or samples in biological studies. This similarity measure is the intersection of sets. The calculator is designed primarily for biologists, but is universal for estimating the intersection of sets and can be applied to other, non-biological problems.

      Log-normal distribution It calculates the probability density function (PDF) and cumulative distribution function (CDF) of long-normal distribution by a given mean and variance.

      Mann-Whitney test This online calculator performs the Mann–Whitney U test (also called the Mann–Whitney–Wilcoxon (MWW), Wilcoxon rank-sum test, or Wilcoxon–Mann–Whitney test).

      Negative Binomial Distribution. Probability density function, cumulative distribution function, mean and variance This calculator calculates negative binomial distribution pdf, cdf, mean and variance for given parameters

      Number to Probability This online calculator takes a list of events along with number of times the particular event occurred and calculates the probability (and log probability) of each event by dividing event count to the total number of events.

      Paired Sample t-Test This online calculator performs t-Test for the Significance of the Difference between the Means of Two Correlated Samples

      Palyi-Kownacki dominance index This calculator allows you to calculate species dominance using the two indicators most commonly considered in community analyses, species occurrence and abundance.

      Pearson correlation coefficient The Pearson correlation coefficient calculator is a tool that allows users to input sets of paired random variables and calculate the correlation between them.

      Poisson Distribution. Probability density function, cumulative distribution function, mean and variance This calculator calculates poisson distribution pdf, cdf, mean and variance for given parameters

      Scatter diagram This calculator constructs a scatter diagram (dot plot) that depicts the relashionship between two variables by putting each pair as point on the Cartesian plane. The values of variables are set as pairs of numbers separated by semicolons or tabs.

      Seasonal Indices for Quarterly Data This online calculator calculates seasonal indices based on quarterly data using the method of simple averages

      Seasonal fluctuations. Seasonal indices. Method of simple averages The study of periodic (seasonal) fluctuations. Calculation of average seasonal indices by the method of simple averages.

      Simple Moving Average Simple Moving Average calculation based on candles

      Spearman's Rank Correlation Calculator This online calculator calculates the Spearman's rank correlation coefficient, which is a measure of the degree of association between two ranked variables.

      Sсhorygin similarity coefficient for a series of samples This online calculator allows you to use a table of species distrubution in samples to calculate the Schorygin coefficient (or commonality coefficient of specific abundance) in pairs for each pair in a series of samples.

      Text fitness This online calculator computes text "fitness". That is, how similar the given text to other texts written in English language.

      Text fitness (version 2) This online calculator calculates measure known as fitness score, of how given text is similar to a typical English text. It uses frequencies of unigrams, bigrams and trigrams to calculate fitness score. The reference frequencies are calculated from Leipzig Corpora Collection and can be downloaded from http://practicalcryptography.com/cryptanalysis/text-characterisation/quadgrams/. The less value you get, the better.

      Text fitness (version 3) This online calculator calculates measure known as fitness score, of how given text is similar to a typical English text. It uses logarithms of probabilities with normalization to calculate fitness score. The reference frequencies are calculated from Leipzig Corpora Collection and can be downloaded from http://practicalcryptography.com/cryptanalysis/text-characterisation/quadgrams/. The less value you get, the better.

      Time Series Autocorrelation function (ACF) This online calculator computes autocorrelation function for given time series and plots correlogram

      Triple exponential smoothing Description and examples of triple exponential smoothing

      Two sample t-Test The calculator to perform t-Test for the Significance of the Difference between the Means of Two Independent Samples

      Weighted moving average Weighted moving average calculation by candles

      Z-score from P-value This online calculator calculates z score from p value

  • Telecommunications

    • Erlang Traffic Calculator The Erlang calculator computes the amount of telecommunications traffic, measured in Erlangs.

      Morse Code Converter: Translate and Decode Messages Our Morse Code Converter is a versatile tool designed to convert text to Morse code and vice versa.

      Morse-ify and Modify. The calculator transforms text into Morse code and then replaces dots and dashes with user-specified symbols. This can be a fun way to create unique messages that can be shared with friends and family. Users can choose any symbols they want to replace dots and dashes with, making the messages even more personalized.

      Number of agents in a call center The calculator works out number of call center agents using Erlang C formula for given call load and service level.

      PBX channel number calculation Calculates number of PBX telecommunications channels for given traffic load using Erlang B and Engset algorithms

      VOIP call bandwidth The calculator works out bandwidth required to handle given number of VOIP calls with given audio codec.

  • Units converters

    • Area Converter This online calculator is designed to convert between different units of area.

      Beaufort scale Conversion between wind speed measurement units including Beaufort numbers, km/h, m/s, mph, fps.

      Conversion between imperial and metric units of area These calculators convert imperial to metric and metric to imperial units of area

      Conversion of pounds into inches Conversion of old pounds artillery caliber into more modern inches and millimeters

      Cubic meters of wood This calculator calculates the volume in cubic meters from unit sizes and number of units and vice versa

      Degrees-minutes-seconds to decimal degrees conversion and vice versa. This online calculator converts the value of an angle given in the degrees-minutes-seconds to degrees, expressed in decimal fraction and back from decimal fraction to degrees-minutes-seconds.

      Digital image size in pixels and photo print size This article is about the relation between an image size in pixels and a photographic print size. First, it recommends the photographic print size for given digital image dimensions in pixels. Second, it finds the resulting pixels per inch value for a printed digital image with known linear and pixel dimensions.

      Display aspect ratio and dimensions This online calculator finds screen dimensions - height, width and area, given the diagonal value and aspect ratio.

      Exotic length units Converter from exotic length units to meters

      Expressing length through different units Calculator expresses a given length through the different units.

      Height in the old Russian system of measures This calculator computes height expressed in the old Russian measure system units: arshins and vershoks

      Imperial to Metric and Metric to Imperial measures of length converter The calculators below convert units of length from Metric to Imperial and from Imperial to Metric and display results as fractional values and as composite values.

      Inches to Pixels and Pixels to Inches Converter The Inches to Pixels and Pixels to Inches Converter is a simple online calculator that allows you to convert measurements between inches and pixels based on the provided resolution in pixels per inch.

      MPG to L/100 km Conversion Calculator This online calculator converts miles per gallon to liters per 100 kilometers

      Nautical Units Converter This calculator converts various nautical measurement units. It includes conversions for speed and distance units. For speed, it can convert knots to miles per hour, kilometers per hour, feet per second or meters per second. For distance, it can convert nautical miles to miles, kilometers, cables, leagues, meters or feet.

      Number of flagstones to units of area and vice versa These calculators convert entered number of flagstones to area size and vice versa - calculate number of flagstones needed to cover entered ara size. Metric and imperial units are supported

      Plane angles measurement systems

      Pounds to kilograms conversion and vice versa This online calculator can be used for conversion of kilograms to pounds, ounces and grains as they are used in USA or UK.

      Pressure units converter Calculator which converts units of pressure

      Russian Length Unit Converter The calculators presented in this article are capable of converting units of length between the old Russian system of measurement and the metric system.

      Speed Converter This is a simple conversion calculator for converting between meters per second and kilometers per hour.

      The Decimal to Binary, Hexadecimal, and Octal Converter The Decimal to Binary, Hexadecimal, and Octal Converter is a versatile calculator that allows you to effortlessly convert decimal numbers to binary, hexadecimal, and octal notations.

      Ton-kilometer. Conversion based on the cost of a kilometer Calculation of a cost of ton-kilometer

      Wooden Pack Volume Calculator This online calculator calculates the total volume and price of the pack from the dimensions and quantity of one unit, and price per cubic meter

  • Сryptography

    • PlanetCalc statistics Our first calculator will be focused on project statistics. Actually, it is not a calculator at all, in the sense that it does not calculate, but simply shows the statistics of our project in the form of tables and diagrams.

      A1Z26 cipher A1Z26 is very simple direct substitution cypher, where each alphabet letter is replaced by its number in the alphabet.

      A2Z52 encoder/decoder This online calculator allows users to encode and decode messages using the A2Z52 cipher.

      Accounting for promissory notes at a complex discount rate

      Alphabet The calculator displays all the letters of a given language.

      Amount of timber for the house This online calculator calculates the amount of timber needed to build a house not including a roof.

      Apartment sale tax Apartment sale tax

      Apartment sale tax in Russia Apartment sale tax in Russian federation according to 2017 legislation changes

      Atbash cipher This calculator allows you to encrypt and decrypt text with Atbash method

      Average wage сalculation (for Russia) The calculator calculates the average wage, according to the decree of the Russian Federation government dated December 24, 2007 "On specifics of calculation of average wages" in edition of Russian Federation Government Resolution dated November 11, 2009.

      BCD to Decimal Convertor Converts a BCD value into its decimal equivalent.Digits of the decimal number are identified by grouping four BCD digits/bits.For example: 0100 1001 => 49

      Batch conversion from one number system to another Batch conversion of a list of numbers from one positional number system with the specified base, to another with the specified base.

      Caesar cipher with numbers This online calculator applies Caesar cipher not only to the letters, but to the numbers as well. Numbers expands the alphabet and are included to the rotations. Other symbols except letters and numbers are not transformed.

      Calculadora Blogger Post Calculadora Blogger Post

      Calculate weights of the mixtures to get desired final mixture concentration This online calculator calculates the weights of the input mixtures of given concentrations needed to get the given weight and the given concentration of the final mixture

      Calculating the partial derivative by its definition This online calculator performs numerical differentiation of a function of several variables - the approximate calculation of all partial derivatives of a function at a given point - over all variables.

      Calculation of the derivative as a limit at a point This online calculator performs а numerical differentiation - the approximate calculation of the derivative of a function at a given point. It calculates the derivative as a value of the limit at a given point by successive approximations until the specified accuracy is reached.

      Calculation of volume, weight or quantity of construction bars This online calculator calculates the weight, cost, total length and other characteristics of construction bars.

      Carbon emission calculator This online calculator allows you to calculate carbon emissions from measurements obtained by the static chamber (closed-chamber) method.

      Commission in the Polygon network (Polygon Gas Station) 1 Gwei = 1e-9. Refreshes only after 5 minutes for gas and 15 minutes for course. Read more about Gas at https://docs.polygon.technology/docs/develop/tools/polygon-gas-station. Coin rates are from https://www.coingecko.com. More about EIP1559 at https://docs.polygon.technology/docs/develop/eip1559-transactions/how-to-send-eip1559-transactions.

      Compound interest deposit term calculator This online calculator calculates the term needed to obtain the specified accrued amount with compound interest.

      Compound interest including commissions on the loan amount This online calculator determines the actual rate of a loan, taking into account a comission and one-time charges

      Compound interest rate calculator This online calculator calculates the interest rate which is needed to get the given accrued amount in the given deposit term using compound interest

      Conversion of share to percentage of total This online calculator converts the number/size/volume/share of parts to a percentage of the total number/size/volume/share

      Convert RGB integer colours to hexadecimal color code for web The calculator converts a colour given in RGB integers into a hexadecimal string suitable, for example, for css.

      Count the number of separated values in the list This online calculator counts the number of values in the list, separated by provided separator.

      Cyrillic, mailto and URL-encoded symbols This online calculator can generate mailto links with Cyrillic characters.

      Física I Demystifier aaaaaaaaaaaaaaaaa

      Generator of an OpenOffice document (odt) based on a template document and data from another document This generator allows you to load an OpenOffice document with data, a document template, and generate a final document based on the data and the template. For example, a data document may contain a list of event attendees, a template document may contain an invitation card template, and the final document will contain invitation cards for all attendees from the list.

      Gravity Falls Author's symbol substitution cipher decoder This online calculator can decode messages written in the Author's symbol substitution cipher

      Gravity Falls Bill's symbol substitution cipher decoder This online calculator can decode messages written with Bill's symbol substitution cipher

      Handlebars Templates Sandbox for experimenting with the Handlebars templating engine. Allows you to set a text template, JSON object and display the result processed by the handlebars js library

      Herfindahl-Hirschman Index This online calculator calculates the Herfindahl-Hirschman Index (HHI), which is used to estimate the concentration of production in a product market.

      Index of Coincidence This online calculator calculates index of coincidence (IC, IOC) for the given text

      Ingresa las Medidas de tu Piscina y calcula los M3

      Inkscape SVG cleaner This online tool remove non-standard elements from SVG files created with the Inkscape program

      Involute of Circle ### Involute Calculation ###The following snippet calculates the \( x \) and \( y \) coordinates of an involute of a circle. Given a radius \( r \), an angle \( \theta \) in degrees, and an additional angle \( a \) in degrees, the code first converts these angles to radians and then computes the coordinates.\( x = r \times (\cos(\text{t+a}) + \text{t} \times \sin(\text{angle2})) \)\( y = r \times (\sin(\text{t+a}) - \text{t} \times \cos(\text{t+a})) \) The formula for calculating the x-coordinate is given by: x = r × (cos(t+a) + t × sin(t+a)) y = r × (sin(t+a) - t × cos(t+a))

      Isogram checker This online calculator can check if a word/phrase is an isogram.

      Jpeg file structure The calculator displays the dimensions of an input jpeg file as well as jiff markers stored in the file.

      Kasiski test This online calculator performs Kasiski examination of an entered text using trigrams in attempt to discover a key length

      Kinetic energy in classical and relativistic mechanics Kinetic energy of a point object in classical Newtonian mechanics and in relativistic mechanics.

      Land tax Calculates the land tax

      Largest common subsequence This online calculator is designed to find the largest common subsequence of two sequences given as strings.

      Least Significant Bit steganography The first online calculator on this page uses a Least Significant Bit steganographic method to hide a message in a digital image. The second online calculator reveals the message hidden by the first calculator.

      Linear intersection

      Malthusian equation This online calculator calculates the unknown parameter of the Malthusian equation from the known parameters.

      MyDates

      New customs duties on import of cars by individuals It calculates the amount of customs duties for the price, age and engine capacity of the car.

      ODT Data Extractor Utility calculator for debugging the logic of extracting data from an ODT document. It is assumed that the extracted data will be used to generate other documents according to the "handlebars" template.

      Old Russian money Converts old Russian monetary units into more common rubles and kopecks. Created by user's request.

      OpenOffice/LibreOffice document generator using Handlebars templates This online generator allows you to upload a document template as an OpenOffice Document File (odt) file, with Handlebars templates included, and generate a final document based on the data entered in JSON format.

      PATHFINDER cipher checker This online calculator decrypts digits encrypted by PATHFINDER type of cipher.

      Pangram checker This online calculator can check if a phrase is a pangram.

      Pigpen cipher decoder This online calculator can decode messages written in the pigpen cipher

      Proportionality of the figure 2 Calculation of the proportionality of the figure in terms of waist and height.

      Quick unit converter This online calculator allows you to enter multiple values across a space and set a factor (multiplier) to convert the entered values from one unit of measurement to another.

      Rail fence cipher This article contains two calculators, first can be used to encode message with the rail fence cipher, second can be used to crack message encoded with the rail fence cipher by brute force. Decoded simply outputs decoded message for different number of "rails".

      Random Race Heat Calculator

      Russian text typed in English letters Restores the Russian phrase, accidentally typed on the English keyboard layout.

      Simple interest - floating interest rate This online calculator calculates the accrued amount if bank uses the floating interest rate and the simple interest method

      Simple interest including commissions on the loan amount

      Simple interest rate calculator This online calculator calculates the interest rate which is needed to get the given accrued amount in the given deposit term using simple interest

      Standard Galactic Alphabet decoder This online calculator can decode message written with standard galactic alphabet symbols

      Substitution cipher decoder This online calculator tries to decode substitution cipher without knowing the key. It uses genetic algorithm over text fitness function to break the encoded text. Note that you may need to run it several times to find completely accurate solution. The calculator logic is explained below the calculator.

      Sudden Acute Radiation Syndrome to date sudden loss in humanity With any radiologic event whether it be alpha beta or gamma rays present there will be an approximate 10% decrease in the longevity in human life.

      System of nonlinear equations solver This online calculator attempts to find the numeric solution to a system of nonlinear equations using the method of coordinate descent

      Tab and Line Break Remover The calculator is a simple yet useful tool that helps users remove tab and/or newline symbols from text.

      Text file decoder Using this calculator you can decode and read a text file in some encoding.

      The Linda Index This online calculator calculates the Lynda index, which determines the degree of inequality between the leading enterprises in the market

      The Verhulst model This online calculator plots the Verhulst-Pearl equation, or logistic curve, using the given initial parameters.

      The next lucky ticket Enter the current ticket number - on the output we get the number of the next lucky ticket and how many tickets are left till it

      The pet's age in human years The calculator converts your pet's age into the corresponding human age as a number of years, months and days.

      Tips and tricks #10: Files, long calculation mode The article describes how to use input and output files in Planetcalc calculators

      Tips and tricks #1: How to set output value This article describes process of calculator creation and how to set output value.

      Tips and tricks #2: How to make calculator translatable into different languages This article describes the process of adding translation support to the calculator, so it can be translated into different languages.

      Tips and tricks #3: How to make calculator with custom errors This article describes the process of adding custom errors to the calculator

      Tips and tricks #4: How to make calculator with table output This article describes how to make calculator which outputs results in table format

      Tips and tricks #6: How to make calculator with virtual keyboard This article describes how to create calculator with virtual keyboard using SVG image

      Tips and tricks #7: How to make calculator with SVG image map This article describes how to create calculator with image map using SVG image

      Torricelli's law (fluid dynamics) This calculator allows you to calculate the velocity of an ideal fluid flowing from a small hole based on the height of the fluid above the hole, as well as the horizontal distance covered by the jet as a function of the height of the hole above ground level.

      UTF-8 encoded string The calculator converts an input string to a UTF-8 encoded binary/decimal/hexadecimal dump and vice versa.

      Vigenère cipher breaker This online calculator tries to decode Vigenère cipher without knowing the key. It uses the index of coincidence technique.

      Wage payment delay compensation It calculates the amount of monetary compensation, which the employer must pay the employee for the delay of wages or other payments, according to the Russian Federation Labour Code.

      Wordpress plugin With Planetcalc plugin for Wordpress you can easily insert any planetcalc calculator in your wordpress-based site or blog pages.

      foil_gain Calculates "foil gain" rule quality measure for rule-based classification. Used in sequential covering algorithm.

      piscina piscina

      Калкулатор на поени

      Новые элементы в списке

• Study

  • Astronomy

    • Dates of the beginning and end of polar night and polar day at a given latitude This online calculator calculates the start and end dates of polar night and polar day at a given latitude. The latitude of the observation site must be north of the north polar circle or south of the south polar circle.

      Declination and maximum altitude of the Sun above the horizon on a given date This online calculator calculates the declination of the Sun on a given date and the maximum altitude above the horizon on that day for a given latitude

      Shadow length Gives a vertical object shadow length for given coordinates and time. Also calculates shadow growth during whole day.

      Sunrise and sunset time This online calculator is intended for sunrise and sunset time calculation for given place and date. The calculator algorithm is obtained from the great book of Oliver Montenbruck and Thomas Pfleger "Astronomy on the Personal Computer".

      Zero Shadow Day This online calculator calculates the dates of zero shadow days at a given latitude. The latitude of the observation site must be south of the Tropic of Cancer and north of the Tropic of Capricorn.

  • Chemistry

    • ABV (Alcohol by volume) This online calculator estimates alcohol by volume (abv) based on original and final specific gravity values.

      Acid-base titration curves This online calculator builds theoretical titration curves for monoprotic acids and bases

      Alcohol amount in the aqueous alcohol solution Defines the mass and volume concentration of ethanol in the solution of two liquids with different levels of alcohol.

      Chemical equation balancer This online calculator balances equations of chemical reactions using algebraic method.

      Concentration of analyte with uncertainty analysis for replicate titrations This online calculator calculates the molarity of a solution from replicate titrations data. It also performs uncertainty analysis and displays result with the uncertainty.

      Convert grams to liters and liters to grams This online calculator converts grams to liters and liters to grams given a gas formula. It uses molar volume of a gas at STP (standard temperature and pressure)

      Convert grams to moles and moles to grams This grams to moles/moles to grams calculator converts between moles and grams using a formula of a substance.

      Convert moles to liters and liters to moles This online calculator converts moles to liters of gas and liters of gas to moles at STP (standard temperature and pressure).

      Density of oil Recalculation of the density of oil for different temperature and pressure values. Formulas are taken from Russia's GOST R 8.610-2004. "State system for ensuring the uniformity of measurements for the density of oil. The tables for recalculation" standard

      Dilution calculator and problems solver This online calculator can calculate the molar concentration (molarity) of a solute or volume of a solution before or after the dilution.

      Dilution of solutions This online calculator allows you to find one of four parameters: volume before dilution, molar concentration before dilution, volume after dilution, molar concentration after dilution - based on the other three. It is intended for solving problems on dilution of solutions.

      Fertilizing Calculates an additional amount of potassium chloride to achieve the standards when adding other potassium fertilizers.

      Finding the reactions for the chain of transformations This online calculator attempts to find reactions for an entered list of substances using its database of chemical reactions.

      Mixing solutions of different concentrations The concentration of a chemical in a solution can be reduced by mixing it with a less concentrated solution of the same substance. The calculator below allows you to determine the proportions in which two solutions need to be mixed to obtain the desired concentration.

      Molar Mass Calculator Calculate the molar mass of a substance given its chemical formula. The calculator also provides information on the individual elements in the formula.

      Molar mass of the substance Calculates the molar mass of the substance using atomic mass units from the periodic table

      Molar volume This calculator calculates the molar volume of an ideal gas at different conditions (temperature and pressure)

      Molarity calculator This online calculator can calculate the molar concentration of a solute in a solution, or mass of a solute in a solution with a specific molar concentration.

      Molarity to molality and vice versa This online calculator converts the molar concentration of a solution to molar concentration and vice versa if the density of the solution is known.

      Peptide calculator Peptide calculator

      Peptide dissolution calculator Peptides dissolution calculator

      Peptides dissolution calculator. Peptides dissolution calculator.

      Raoult's Second law and the freezing temperature. Calculation of boiling point and crystallization (freezing) of non-electrolyte solutions.

      The Chemical Reaction Search Calculator The Chemical Reaction Search Calculator is a powerful tool that allows users to search a database of over 500 non-organic chemistry reactions commonly found in student textbooks.

      pH of a solution calculator These online calculators calculate the pH of a solution. There are two calculators – one for either strong acid or strong base, and another for either weak acid or weak base.

  • Math

    • Algebra

      • Combinatorics

        • 2D Bin Packing Problem Solver This online calculator tries to solve an offline two-dimensional (2D) bin packing problem using Maximal Rectangles heuristic algorithm

          2D Strip Packing Problem Solution using Genetic Algorithm Efficiently Solve the 2D Offline Strip Packing Problem with Our Genetic Algorithm Calculator

          Bell triangle This online calculator constructs the Bell triangle for the given number of rows.

          Bin packing problem Calculator solves bin packing problem by different heuristic algorithms. Created at the request of the user.

          Bin packing problem 2 Calculator solves bin packing problem with different heuristic algorithms and gives you a best. Created at the user's request.

          Combination By Lexicographical Index This online calculator finds combination by index in lexicographically ordered set.

          Combinations generator This combinations calculator generates all possible combinations of m elements from the set of n elements.

          Combinatorial number system This online calculator represents given natural number as sequences of k-combinations, referred as the combinatorial number system of degree k (for some positive integer k), aka combinadics

          Combinatorics – combinations, arrangements and permutations This calculator calculates the number of combinations, arrangements and permutations for given n and m

          Combinatorics. Permutation generator from n to m without repetitions Combinatorics. Permutation generator from n to m without repetitions

          Combinatorics: Permutation Generator with Repetitions Generate permutations with repetitions from n to m elements using this calculator for combinatorial analysis.

          Factor Pairs Generator This calculator generates all pairs of factors for given integer.

          Generator of combinations that satisfy a condition For elements with weights this calculator can filter out all combinations where total weight is under the specified limit.

          Integer partition This online calculator generates all possible partitions of an entered positive integer.

          Jaccard / Tanimoto coefficient This online calculator measures the similarity of two sample sets using the Jaccard / Tanimoto coefficient

          Making up words out of the syllables Calculator sorts out all combinations of syllables to make words. English homework helper.

          Multiway Number Partitioning This online calculator searches for the solution of the multiway number partitioning optimization problem using the Complete Greedy Algorithm.

          Narayana Algorithm For Next Lexicographic Permutation This online calculator implements Narayana algorithm to generate the next permutation in lexicographic order

          Participant Placement Calculator The Participant Placement Calculator generates a list of routes for participants given the number of starting positions and participants.

          Permutations calculator This online calculator generates all permutations for the specified set of elements. Note that the total number of permutations is the factorial of the number of elements in the set - for a large number of elements, the calculation will take a significant amount of time.

          Restricted Growth Strings Generator This online calculator generates restricted growth strings for the given size

          Selection of distribution This calculator arranges a given set of numbers in an order in which all sums of some set of combinations fall within a given range.

          Set Combinations Calculator The calculator is a combination generator that creates all possible combinations of items from different sets, and lists them in a table with columns labeled by set names and rows representing each combination.

          Set partitions generator This online calculator generates all possible partitions of a given set.

          Stirling numbers of the second kind This online calculator outputs Stirling numbers of the second kind for the given n

          Student Seating Chart Generator Generate seating chart combinations based on students' seating preferences using a genetic algorithm.

          Team Combinations Generator This online calculator generates all combinations of teams for a given number of players and team size, so that everyone can play with and against everyone.

          Team combinations, with conditions such as team roles and limits This online calculator generates all possible combinations of creating a team using limiting conditions like team roles and limits

          Tips and tricks #11: Dynamic table columns This article describes how to work with dynamic columns in your calculator

      • Number theory

        • Continued fraction The calculator represents a fraction as continued fraction

          Egyptian Fraction to Rational Number Converter The Egyptian Fraction Calculator is a tool that converts an Egyptian fraction into a rational number.

          Egyptian fractions The calculator converts decimal number or simple fraction to Egyptian fraction.

          Fermat primality test The calculator tests an input number by a primality test based on Fermat's little theorem.

          Miller–Rabin primality test The calculator checks whether or not a number is prime by Miller-Rabin primality test

          Modular arithmetic This modulo calculator performs arithmetic operations modulo p over a given math expression.

          Modular exponentiation The calculator performs modular exponentiation of big numbers.

          Prime numbers. Sieve of Eratosthenes The calculator finds prime numbers using "Sieve of Eratosthenes" method.

          Relation between two numbers Different relations between two numbers. Created by user's requst

          Roman and Decimal Number Converter This calculator can convert numbers ranging from 1 to 3999 between Roman numerals and decimal numbers.

          Sexagesimal Sexagesimal number converters. The calculator converts sexagesimal number to rational or decimal and vice versa.

      • Polynomials

        • Distinct degree factorization The calculator finds distinct degree factors of a polynomial in finite field

          Greatest common divisor of several polynomials The calculator gets GCD of several univariate polynomials at a time.

          Lagrange polynomial calculator This online calculator builds Lagrange polynomial for a given set of points, shows a step-by-step solution and plots Lagrange polynomial as well as its basis polynomials on a chart. Also, it can interpolate additional points, if given

          Partial fraction decomposition The calculator decomposes a polynomial fraction to several fractions with a simpler denominator.

          Polynomial Greatest Common Divisor The calculator gives the greatest common divisor (GCD) of two input polynomials.

          Polynomial Taylor Shift The calculator evaluates Taylor shift of the given polynomial using Shaw and Traub algorithm.

          Polynomial addition /subtraction The calculator performs polynomial addition or subtraction

          Polynomial factorization The calculator finds all factors of a polynomial with rational coefficients

          Polynomial factorization in a finite field The calculator finds factors of a polynomial using Cantor-Zassenhaus algorithm

          Polynomial factorization modulo p The calculator finds polynomial factors modulo p using Elwyn Berlekamp algorithm

          Polynomial factors as formula This supplementary calculator is intended for representation input univariate polynomial factors as math formula.

          Polynomial fast exponentiation in finite field The calculator raises a polynomial to a power in finite field.

          Polynomial integral The calculator integrates a univariate polynomial and calculates an integration constant by a point.

          Polynomial math The calculator evaluates a polynomial expression. The expression contains polynomials and operations +,-,/,*, mod- division remainder, gcd - greatest common divisior, egcda, egcdb, lc, deg, pp, content, monic functions.

          Resultant The calculator gives the resultant of two univariate polynomials. It also displays the Silvester matrix.

          Square-free polynomial factorization in finite field The calculator finds all square factors of polynomial in finite field.

          Synthetic division Synthetic division is a simplified way of dividing a polynomial using only the coefficients of the terms in the polynomial. It is a shortcut method that avoids the need for long division or the use of the polynomial remainder theorem.

          The Newton Polynomial Interpolation This online calculator constructs Newton interpolating polynomial for given data points. The calculator also shows general form and simplified form, interpolates additional points, if entered, and plots a chart

          The discriminant This online calculator calculates the discriminant of the quadratic polynomial, as well as higher degree polynomials

      • linear algebra

        • Characteristic polynomial This online calculator calculates coefficients of characteristic polynomial of a square matrix using Faddeev–LeVerrier algorithm

          Cramer's Rule Linear Equations Solver This online calculator takes a system of linear equations and applies Cramer's rule to solve it, showing all intermediate steps in the process.

          Decomposition of a square matrix into symmetric and skew-symmetric matrices This online calculator decomposes a square matrix into the sum of a symmetric and a skew-symmetric matrix.

          Extended polynomial Greatest Common Divisor in finite field The calculator computes extended greatest common divisor of two polynomials in finite field

          Gaussian elimination in complex numbers Solve complex coefficient linear equation system.

          Linear recurrence with constant coefficients This online calculator calculates a given number of terms of a linear recurrence sequence (constant-recursive sequence) and also their sum in cumulative total.

          Matrix Determinant Calculator The calculator computes the determinant of a matrix.

          Matrix Inverter A matrix inverse calculator using Gauss-Jordan algorithm.

          Matrix Multiplication Calculator Perform matrix multiplication by entering the elements of two matrices. The calculator will compute the product matrix.

          Matrix Rank This online calculator determines the rank of a given matrix

          Matrix Transpose The transpose of a matrix is an operator which flips a matrix over its diagonal; that is, it switches the row and column indices of the matrix A by producing another matrix, often denoted by Aᵀ

          Matrix triangulation calculators Matrix triangulation using Gauss and Bareiss methods.

          Modular inverse of a matrix This calculator finds the modular inverse of a matrix using adjugate matrix and modular multiplicative inverse

          Reduced Row Echelon Form (RREF) of a matrix calculator This online calculator reduces a given matrix to a Reduced Row Echelon Form (rref) or row canonical form, and shows the process step-by-step

          Solution of nonhomogeneous system of linear equations using matrix inverse The solution of a nonhomogeneous system of linear equations using matrix inverse

      • Others

        3x3 Equation Solver This calculator is designed to solve systems of three linear equations.

        Area de la Sombra de un Objeto El área de la sombra se refiere a la de un objeto cuadrado o rectangular.

        Bisection method The bisection method in mathematics is a root-finding method that repeatedly bisects an interval and then selects a subinterval in which a root must lie for further processing. The method is also called the interval halving method.

        Completing the square This online calculator allows you to use completing the square technique to complete the square.

        Complex numbers The calculator displays complex number and its conjugate on the complex plane, evaluate complex number absolute value and principal value of the argument . It also demonstrates elementary operations on complex numbers.

        Complex polynomial value calculation The calculator evaluates polynomial value. The polynomial coefficients can be either real or complex.

        Determinant by Gaussian elimination Finding matrix determinant using Gaussian elimination in complex, rational or real numbers.

        Determinant of 3x3 matrices This calculator calculates the determinant of 3x3 matrices

        Eigenvalue calculator This online calculator computes the eigenvalues of a square matrix up to the fourth degree by solving the characteristic equation.

        Eigenvector calculator This online calculator computes the eigenvectors of a square matrix up to the 4th degree.

        Evaluating expressions This online calculator substitutes a specific value for each variable, and performs the operations, evaluating the given expression.

        FOIL Calculator This online calculator shows steps to multiply two binomials using the FOIL method (or the FOIL mnemonic)

        Factoring trinomials This is factoring trinomials calculator, in other words, the calculator which can factor trinomials given the three terms of the trinomial.

        False position method The false position method is a root-finding algorithm that uses a succession of roots of secant lines combined with the bisection method to approximate a root of a function f.

        First Degree Equation Solver This calculator solves the first degree equations with one variable - the kind that is given in elementary school.

        Geometric progression This calculator computes n-th term and sum of geometric progression

        Geometric progression. The common ratio and the first term Finding the common ratio and the first term the geometric progression for two adjacent terms.

        Hill cipher This calculator uses Hill cipher to encrypt/decrypt a block of text.

        Linear approximation This online calculator derives the formula for the linear approximation of a function near the given point, calculates approximated value and plots both the function and its approximation on the graph

        Modular Multiplicative Inverse Calculator This inverse modulo calculator calculates the modular multiplicative inverse of a given integer a modulo m.

        Modulo over rational numbers The calculator performs modulo division over rational dividend and rational divisor.

        Newton's method This online calculator implements Newton's method (also known as the Newton–Raphson method) for finding the roots (or zeroes) of a real-valued function.

        Polynomial Multiplication Calculator The polynomial multiplication calculator takes two univariate polynomials, each represented as a set of coefficients, and multiplies them together to generate the resulting polynomial.

        Polynomial division This calculator divides one polynomial by another polynomial.

        Polynomial power expansion The calculator expands n-th power of a given polynomial.

        Polynomial root isolation The calculators isolates real roots of the input univariate polynomial using Sturm and VAS-CF methods.

        Polynomial roots The calculator solves polynomial roots of any degree. For small degree polynomials analytic methods are applied, for 5-degree or higher the polynomial roots are estimated by numerical method.

        Quadratic Equation Solver The quadratic equation calculator accepts the coefficients a, b, and c of a quadratic equation in the standard form, and then calculates the roots of the equation, including complex roots. The formulas can be found below the calculator.

        Quartic equation solution This calculator produces quartic equation solution using resolvent cubic.

        Secant method The secant method is a root-finding algorithm that uses a succession of roots of secant lines to better approximate a root of a function f. A brief secant method description can be found below the calculator

        Squarefree polynomial factorization The calculator extracts square factors from the input polynomial.

        Standard form polynomial The calculator converts a multivariate polynomial to the standard form.

        Stirling's approximation of factorial Online calculator computes Stirling's approximation of factorial of given positive integer (up to 170!)

        The rational number as a fraction This online calculator writes the rational number as a fraction (the ratio of two integers), using the formula of infinite geometric sequence.

        Trial Division Integer Factorization Calculator This online calculator performs integer factorization using the trial division method to determine the prime factors of a given number

        Two Buckets Puzzle Calculator This online calculator finds a solution for a variation of two buckets puzzle where you need to fill a tank with certain volume.

        Two-Variable Linear Equation Solver This calculator solves a system of equations of first degree with two unknowns. You enters six coefficients, it finds the values of the unknowns and detects cases of no solution or infinite solutions.

        nth root algorithm This online calculator implements nth root algorithm to find the principal nth root of a positive real number.

    • Applied mathematics

    • Geometry

      • 3D Vector Dot Product Calculator This online calculator calculates the dot product of two 3D vectors

        3d coordinate systems Transforms 3d coordinate from / to Cartesian, Cylindrical and Spherical coordinate systems.

        Altitude of a triangle This online calculator computes the altitude length of a triangle, given the lengths of sides of a triangle.

        Angle between two vectors This online calculator finds the angle between two vectors

        Angle bisector of a triangle This online calculator computes the length of angle bisector given the lengths of triangle edges

        Angular size, linear size, and distance These calculators computes value of angular size or linear size or distance from the other two's

        Apparent length from angular size This online calculator converts angular size of distant object to its apparent length, or, in other words, the length of obstacle needed to block that distant object from view, if obstacle placed at some known distance before our eyes.

        Arc length calculator This universal online calculator can find arc length of circular segment by radius and angle, by chord and height and by radius and height.

        Area of a convex quadrilateral. Example of creating a calculator. This online calculator calculates area of a convex quadrilateral given diagonal values and value of angle between them. Article also describes the process of creating a calculator.

        Area of a quadrilateral This article lists several calculators to compute the area of a quadrilateral

        Area of a rectangle by coordinates This online calculator calculates area of a convex quadrilateral (rectangles too) given coordinates of four vertices (corners)

        Area of an irregular quadrangle with the given sides Calculates an area of an irregular quadrangle with the given sides

        Area of triangle by coordinates This calculator determines the area of a triangle using its vertex coordinates in the cartesian coordinate system.

        Area-to-Radius Calculator This online calculator calculates the radius of a circle from the given area of a circle.

        Ball Volume to Radius Calculator This calculator calculates the radius of a ball from its volume.

        Calculation of elevation from horizontal distance and inclination angle with allowance for measurement error This online calculator allows you to calculate the elevation from horizontal distance and inclination angle taking into account the mean square errors of measurements.

        Calculation of the edge cut margin to obtain an octagonal face This online calculator calculates the indentation of the beginning of the cut along the edge of a square in cross-section bar to obtain a regular octagon at the base (the end is a regular octagon).

        Center of mass of a triangle This online calculator finds the centroid, or barycenter (center of gravity) of a triangle by the coordinates of its vertices

        Circle formulas Circle formulas

        Circular sector Calculates area, arc length, perimeter, and center of mass of circular sector

        Circular segment Here you can find the set of calculators related to circular segment: segment area calculator, arc length calculator, chord length calculator, height and perimeter of circular segment by radius and angle calculator.

        Circumcircle of a triangle This online calculator determines the radius and area of the circumcircle of a triangle given the three sides

        Collinearity This online calculator finds if points are collinear given their coordinates

        Collinearity of vectors in 2d space This online calculator determines if 2d space vectors are collinear

        Cone

        Cone development Calculator of right circular cone / truncated right circular cone development

        Construction Volume Calculator The Construction Volume Calculator allows you to calculate the total volume of a construction project by specifying the volume of various prisms (or rectangular cuboids) and subtracting any volumes you wish to exclude.

        Counting pipes from the end face The approach to the calculation of the number of nested circles of smaller radius at a known length of the describing circle of a larger radius. Created by user request

        Cross Product Calculator The Cross Product Calculator computes the cross product of two vectors in three-dimensional space and provides a visual representation of the result in a Cartesian coordinate system.

        Cube Calculator: Volume, Surface Area, and Sphere Radii The calculator is designed to provide various measurements related to a cube based on its side length. It can calculate the volume, surface area, circumscribed sphere radius, inscribed sphere radius, and the radius of the sphere tangent to edges.

        Cutting a circle Two ways to cut a circle into equal parts : sector cuts and parallel cuts.

        Cylinder

        Cylindrical Tank Volume Calculator Use this calculator to determine your cylindrical tank volume in cubic inches and gallons even if one or both ends are rounded. Especially useful if you've cut the tank in length. If you've got a flat end just leave it blank or enter 0.

        Cylindrical tank volume Cylindrical tank volume

        Ellipsoid Calculates ellipsoid and spheroid volume and surface area.

        Equation of a circle calculator This circle equation calculator displays a standard form equation of a circle, a parametric form equation of a circle, and a general form equation of a circle given the center and radius of the circle. Formulas can be found below the calculator.

        Equation of a circle passing through 3 given points This online calculator finds a circle passing through three given points. It outputs the center and radius of a circle, circle equations and draws a circle on a graph. The method used to find a circle center and radius is described below the calculator.

        Equation of a line passing through two points in 3d This online calculator finds equation of a line in parametrical and symmetrical forms given coordinates of two points on the line

        Equation of a plane passing through three points This online calculator calculates the general form of the equation of a plane passing through three points

        Equations of the line of intersection of two planes This online calculator finds the equations of a straight line given by the intersection of two planes in space. The calculator displays the canonical and parametric equations of the line, as well as the coordinates of the point belonging to the line and the direction vector of the line.

        Equilateral triangle This online calculator calculates characteristics of the equilateral triangle: the length of the sides, the area, the perimeter, the radius of the circumscribed circle, the radius of the inscribed circle, the altitude (height) from single known value

        Find the distance and midpoint between two points This online calculator finds the distance and midpoint between two points in cartesian coordinates.

        Find the intersection of two circles This online calculator finds the intersection points of two circles given the center point and radius of each circle. It also plots them on the graph.

        Function Plotter The calculator plots entered functions on the single coordinate plane.

        General to Standard Form Circle Converter The calculator takes the equation of a circle in general form, with variables for x, y, and constants a, b, c, d and e, and converts it to the standard form equation for a circle with variables h, k, and r. It then calculates the center of the circle (h, k) and its radius r. If the equation cannot be converted to standard form, the calculator reports an error message.

        Heron's formula calculator This calculator calculates the area of a triangle using Heron's formula. This formula gives the area of a triangle from the lengths of all three sides. The formula can be found below the calculator.

        Hip roof calculator This calculator will help you estimate hip roof parameters, including rafters and roof area

        How many circles of radius r fit in a bigger circle of radius R This calculator estimates how many circles of radius r can be placed inside another circle of radius R.

        Inverse trigonometric functions This calculator determines values of inverse trigonometric functions (arcsine, arccosine, arctangent, arccotangent, arcsecant, arccosecant) and outputs it with different measurement units (degrees, radians, minutes, etc)

        Involute of an angle Involute of an angle calculator and finding an angle by the given involute.

        Is a point in a triangle? The calculator determines if an arbitrary point lies inside 2D triangle. The triangle is defined by 3 cartesian coordinate pairs.

        Isometric projection of a vector This online calculator draws isometric projection of a vector, giving its coordinates in 3D space.

        Level of liquid in the cylindrical tank, AKA Quarter-Tank Problem This online calculator finds the height above the bottom of a horizontal cylinder (such as a cylindrical gas tank) to which the it must be filled for it to be full at specified percentage (for example, one quarter full amounts)

        Magnitude of a Vector This online calculator calculates the magnitude of a vector

        Median of a triangle This online calculator computes the median of a triangle given triangle sides

        Pipe cold bending. Flexure depth with the main shaft. Calculates the section flexure depth with pipe bender or bending machine to obtain given parameters.

        Polygon area An online calculator calculates a polygon area, given lengths of polygon sides and diagonals, which split polygon to non-overlapping triangles.

        Pythagorean theorem calculator Our Pythagorean Theorem Calculator can be used to find the missing side length of a right triangle by inputting the lengths of two known sides.

        Quad Pyramid Surface Area Calculator This online calculator calculates the surface area of a quadrilateral pyramid using the lengths of its bases and one of the following parameters: length of the edge, angle of inclination of the faces, or height of the pyramid.

        Rectangle Area Calculator The calculator is a useful tool for calculating the total area of a set of rectangles.

        Rectangle intersection This online calculator displays result of intersection of two rectangles

        Rectangular Area Calculator The Rectangular Area Calculator computes the area of a rectangle based on two inputs: one side length and the length of the diagonal.

        Regular Circumcircle Polygon Area Calculator The calculator calculates the area of a regular polygon given the circumradius and number of sides and displays it along with the area of the circumcircle.

        Regular Polygon Incircle and Circumcircle Calculator This page presents two online calculators: the Incircle of a regular polygon calculator and the circumcircle of a regular polygon calculator.

        Regular polygon, number of sides and length of side from incircle and circumcircle radii This online calculator finds number of sides and length of side of regular polygon given the radii of incircle and circumcircle

        Side length of the regular polygon Calculates the side length of the regular polygon circumscribed or inscribed to a circle. Created by user's request

        Side of regular polygon from polygon area Calculates the side length of regular polygon given the area of the regular polygon and number of sides

        Sine Law Calculator This online calculator determines the lengths of triangle sides given one side and two angles using the law of sines.

        Sine wave calculator Construction of a sine wave with the user's parameters

        Sphere Calculator Calculate the Volume and Surface Area of a Sphere with our online calculator

        Sphere Volume and Radius Calculator This calculator is a two-in-one tool that can be used to find the volume of a sphere given its radius, or the radius of a sphere given its volume.

        Spherical cap and spherical segment This calculator computes volume and surface area of spherical cap and spherical segment

        Spherical sector Calculates surface area and volume of Spherical sector by radius and height

        Table of distances between points This online calculator builds a pairwise table of distances between points using the entered point coordinates.

        The Rectangle Area Calculator with Perimeter Condition The Rectangle Area Calculator with Perimeter Condition is a helpful tool designed for solving math problems that involve calculating the area of a rectangle under specific perimeter conditions.

        The area of a convex polygon from the coordinates of the vertices on the plane This online calculator calculates the area of a convex polygon from the coordinates of the vertices. A convex polygon is built from the vertices using the Jarvis March Algorithm (or Gift Wrapping Algorithm)

        The diagonals of a parallelogram Calculator computes the diagonals of a parallelogram and adjancent angles from side lengths and angle.

        The length of arc of an Earth's parallel at a given latitude This online calculator converts the arc length of an Earth's parallel at a given latitude from degrees to meters.

        Triangle Angle Calculator The Triangle Angle Calculator is a tool that calculates the angles of a triangle given the length of its sides.

        Triangle Area Calculator This calculator is designed to find the area of a triangle using different formulas, depending on the available information about the triangle.

        Triangle Incircle Calculator: Radius, Area, and Ratio The Triangle Incircle Calculator is a tool that allows you to determine the properties of the incircle of a triangle based on its side lengths. By entering the lengths of the three sides, this calculator calculates the radius and area of the incircle, which is the largest circle that can fit inside the triangle.

        Triangle Side Length Calculator using Law of Cosines The calculator calculates the length of the third side of a triangle using the law of cosines, given the length of two sides and the angle between them.

        Triangle values by coordinates of vertices This online calculator calculates a set of triangle values: length of sides, angles, perimeter, and area by coordinates of its vertices

        Trigonometric functions This online calculator computes the values of elementary trigonometric functions, such as sin, cos, tg, ctg, sec, cosec for an angle, which can be set in degrees, radians, or grads.

        Trilateration This online calculator solves the problem of trilateration - determining the coordinates of a point by the distance from that point to three other points with known coordinates.

        Two arguments arctangent The calculator gives an angle between positive axis x and the ray to the given point from point 0. The result corresponds to atan2 function, implemented in many computer languages and math libraries.

        Unfolding a 3D sphere to 2D shapes If you want to made a DIY sphere, you need to unfold the sphere to 2D shapes, or, more strictly speaking, approximate the sphere using petals, or "orange peels" (also called the lunes) on the plane. The calculator calculates basic parameters of such 2D peel and displays coordinates of points for drawing one peel on a plane.

        Vector Addition Calculator This online calculator performs vector addition and displays vectors and vector sum graphically.

        Volume of an elliptical paraboloid This online calculator calculates the volume of an elliptical paraboloid by the height and length of the semi-axes (or radius in the case of a paraboloid of revolution).

        Volume of liquid in a tilted tank with hemispherical heads Calculates volume of liquid in an inclined cylindrical tank with hemispherical ends.

    • mathematical analysis

      • Derivative of a function raised to the power of itself A function is raised to a degree of itself a given number of times and then the derivative is taken.

        The limit of the function at the given point This calculator calculates the limit of the function at a given point numerically. It calculates the limit of the function well as x approaches to the specified value. It's not suitable for calculating the limits when x goes to infinity.

        Volume of the hemisphere cut at an angle Volume of hemisphere asymmetrically cut by a flat plane under a given angle.

    • Others

      Angle in degrees to time units and vice versa This online calculator converts angle between degrees and time units (i.e. hours).

      Antilogarithm Antilogarithm calculator

      Arithmetic progression This online calculator computes the last nth term of arithmetic progression and the sum of the members

      Arithmetic sequence calculator and problems solver This online calculator solves common arithmetic sequences problems.

      Aztec Numerals: Decimal to Aztec Number Converter Translate decimal numbers into Aztec numbers using this calculator. The Aztec numeral system is based on 20 and uses specific symbols for each power of 20.

      Bayes’ theorem This online calculator calculates posterior probabilities according to Bayes’ theorem.

      Bernoulli trials table This online calculator calculates probability of k success outcomes in n Bernoulli trials with given success event probability for each k from zero to n.

      Binary Coded Decimal (BCD) This online calculator converts decimal number to binary code in BCD notation and vice versa

      Binary numbers calculator This calculator supports common mathematical operations over binary numbers: addition, subtraction, division, and multiplication.

      Bézout coefficients This online calculator computes Bézout's coefficients for two given integers, and represents them in the general form

      Centered Moving Average This online calculator calculates centered moving average, which is used instead of moving average then number of periods is even

      Column method for multiplying numbers Calculator shows results of the column method for multiplying numbers, can be used to check answers

      Complex Fraction Simplifier This online calculator evaluates arithmetic expressions with common or complex fractions.

      Converting degrees to radians and vice versa Converts degrees, minutes and seconds to radians and radians to degrees, minutes and seconds

      Coprime integers and pairwise coprime integers This calculator checks if the entered numbers are coprime and pairwise coprime

      Covariance calculator This online calculator computes covariance between two discrete random variables. It also shows the expected value (mean) of each random variable. You can find the formula used for the calculation of covariance below the calculator.

      Cryptarithmetic puzzle solver This calculator is a solver of cryptarithmetic puzzles. A cryptarithmetic puzzle is a number puzzle in which a group of arithmetical operations has some or all of its digits replaced by letters or symbols, and where the initial digits must be found. In such a puzzle, each letter represents a unique digit.

      Cubic equation Solution of cubic equation using Vieta's formulae. Created by user request

      Curve fitting using unconstrained and constrained linear least squares methods This online calculator builds a regression model to fit a curve using the linear least squares method. If additional constraints on the approximating function are entered, the calculator uses Lagrange multipliers to find the solutions.

      Cylindrical Tank Inner Volume Calculator This online calculator calculates the useful inner volume of a cylindrical tank based on its outer dimensions, length, and diameter and wall thickness.

      Derivative It finds one variable function derivative. Step by step differentiation solution is also provided.

      Division of factorials This online calculator solves factorial division problems when you have factorials in the numerator and denominator.

      Egyptian numbers The calculator displays a number in ancient Egypt hieroglyphs. Multiple numbers are recognised as Egyptian fraction.

      Equation of a line given two points This online calculator finds the equation of a line given two points on that line, in slope-intercept and parametric forms

      Estimated Mean of a Population This online calculator allows you to estimate mean of a population using given sample

      Euler method This online calculator implements Euler's method, which is a first order numerical method to solve first degree differential equations with a given initial value.

      Explicit Runge–Kutta methods This online calculator implements several explicit Runge-Kutta methods so you can compare how they solve first degree differential equation with a given initial value.

      Extended Euclidean algorithm This calculator implements Extended Euclidean algorithm, which computes, besides the greatest common divisor of integers a and b, the coefficients of Bézout's identity

      Factorial This online calculator calculates factorial of a positive integer. Practically unlimited positive integer. In fact, it is limited only by the time you are willing to wait until calculation completes. I was patient enough to wait for 100000!

      Fixed-point iteration method This online calculator computes fixed points of iterated functions using the fixed-point iteration method (method of successive approximations).

      Fraction Simplifier Calculator: Simplify Fractions to Lowest Terms The Fraction Simplifier Calculator employs the greatest common factor (GCF) to simplify any fraction you enter, reducing it to its simplest form.

      Fraction to Percent and Percent to Fraction Calculator This online calculator can calculate the percentage value for an entered fraction, or the fraction value for an entered percentage.

      Fraction-Decimal Converter The fraction-decimal calculator is a tool that allows users to convert fractions to decimals and vice versa. Users can enter the numerator and denominator of a fraction to determine its decimal value or enter a decimal to find its simplified fraction value. The calculator simplifies the fraction using the greatest common denominator (GCD) to ensure that the fraction is in its simplest form.

      Function approximation with regression analysis This online calculator uses several regression models for approximation of an unknown function given by a set of data points.

      Gamma function Calculation of the Gamma function using Lanczos approximation

      Gaps and missing numbers finder This online calculator helps you find gaps and missing numbers in an integer sequence.

      Gaussian elimination The calculator solves the systems of linear equations using the row reduction (Gaussian elimination) algorithm. The calculator produces step by step solution description.

      Gaussian elimination with fractions This online calculator solves systems of linear equations using row reduction (Gaussian elimination) while retaining fractions on all calculation stages. At the end, it returns the results in two forms - as a floating point numbers and as a fractions (with numerator and denominator)

      Geometric sequence calculator and problems solver This online calculator solves common geometric sequence problems.

      Golden Ratio Calculator The Golden Ratio Calculator is a tool that determines proportions according to the golden ratio. The user inputs a value and selects its type: long member, short member, or sum. The calculator then computes the other members of the golden ratio based on the input.

      Greatest Common Divisor and Least Common Multiple Calculator Calculate the greatest common divisor (GCD) and the least common multiple (LCM) of two integers.

      Greatest Common Factor Calculator for Three or More Numbers The Greatest Common Factor (GCF) calculator is a powerful tool for finding the greatest common factor of two or more numbers.

      Hyperbolic functions calculator Calculation of hyperbolic functions

      Inverse Hyperbolic Functions Calculation of inverse hyperbolic functions of given argument

      LCD Calculator for Fractions This online calculator find the Least Common Denominator for several fractions

      Lagged Scatterplot Calculator Visualize the Correlation in Time Series Data with Our Lagged Scatterplot Calculator

      Levenshtein Distance This online calculator measures the Levenshtein distance between two strings.

      Linear Diophantine Equations Solver This calculator solves linear diophantine equations (LDE). The LDE calculator is right below, and if you want to recall what linear diophantine equations are, you can find the theory after the calculator.

      Linear congruence calculator This online calculator solves linear congruences

      Liquid volume in a rectangular tank The calculator gives the liquid volume in a partially filled rectangular tank, pitched and turned by the given angles.

      Logarithm Calculator This online calculator calculates logarithms of a given number with respect to a specific base, as well as the natural logarithm (base e) and the decimal logarithm (base 10) of the number.

      Lottery Number Generator This calculator generates a specified number of random integers within a given range.

      Luhn algorithm This calculator calculates digit sequence checksum using Luhn algorithm (mod 10) and validation digit, the digit to be appended to the digit sequence to make whole sequence checksum equal to zero.

      Math Worksheet Generator Math Worksheet Generator is a simple yet powerful tool designed for elementary school students, parents, and teachers. With this calculator, you can easily create customized math worksheets for your students that will help them improve their math skills and knowledge.

      Math equation simplification Simplifies math equation with single variable (x). In eqation you may also use integer and fractional numerical constants arithmetic operations, trigonometric and hyperbolic functions.

      Math equation syntax Math equation samples.

      Math operations on degrees This online calculator supports simple mathematical operations, addition/subtraction/multiplication/division, on degrees

      Mathematical calculator Mathematical calculator is used for evaluation math expressions with arithmetic operations (+-/*^) and functions: sqrt - square root, exp - exponential function, lb - binary logarithm, lg - decimal logarithm, ln - natural logarithm, sin - sine, cos - cosine, tan - tangent, cot - cotangent, sec - secant, csc - cosecant, arcsin - arcsine, arccos - arccosine, arctan - arctangent, arccot - arccotangent, arcsec - arcsecant, arccosec - arccosecant and others

      Mathematical competition tasks Calculator solving some mathematical competition task

      Maya numerals The calculator converts positive integer number to Mayan number.

      Mean, variance and standard deviation of discrete random variable This online calculator calculates the mean, variance, and standard deviation of random variables entered in the form of a value-probability table.

      Midpoint method This online calculator implements a direct midpoint method AKA modified Euler method, which is a second-order numerical method to solve a first-degree differential equation with a given initial value.

      Mod calculator This online calculator performs modulo operation on integers and on doubles as well (because it just returns remainder of division)

      Moment of Inertia Calculates moments of inertia of different figures.

      Multivariable math calculation The calculator calculates the result of a formula with several variables.

      Noisy function generator This online calculator takes function, calculates its values for given range and then adds some random noise to distort original values.

      Normal distribution Plots the CDF and PDF graphs for normal distribution with given mean and variance.

      Normally distributed random numbers generator This online calculator uses the Box–Muller transform to generate a sequence of normally distributed random numbers from a source of uniformly distributed random numbers.

      Number approximation as a sum of unit fractions The calculator approximates a fractional number with a sum of unit fractions (a unit fraction numerator is one). The unit fraction denominator is a number which is less than the base times the base in integer non negative power.

      Numeral System Calculator This online calculator is designed to perform basic arithmetic operations such as addition, subtraction, multiplication, division, and power on numbers written in any numeral system. This means that users can input numbers in binary, octal, hexadecimal, or any other base between 2 and 36, and perform mathematical operations with ease.

      Numeric complements This online calculator calculates radix complement (referred to as r's complement) and diminished radix complement (referred to as (r-1)'s complement) for the given number and the given radix (base).

      Numerical integration To calculate definite integral by the rectangle method, trapezoid method, Simpson method or other Newton-Cotes quadrature methods.

      One's complement, and two's complement binary codes This online calculator displays one's complement and two's complement codes for the entered negative integer.

      One-Variable Function Value Calculator Calculate the values of a one-variable function by entering the function formula and a set of variable values.

      One-variable function graph This online calculator plots one-variable function graph given function formula and range of variable

      P-value This online calculator calculates p-value for one sided and two sided tests given the z-score

      Parallel and perpendicular lines on a plane This online calculator checks lines' slopes to see if they are parallel or perpendicular

      Probability of given number success events in several Bernoulli trials Gives the probability of k success outcomes in n Bernoulli trials with given success event probability.

      Proportion This online calculator finds unknown member of proportion. Created by user's request

      Quick Sum Calculator This online calculator sums up entered numbers. Any symbol what is not a digit, for example, a space, a comma, a semicolon, etc, serves as a separator. It is useful when you need to sum up several numbers but do not have speadsheet program at hand. Use the dot symbol as separator for the decimal part of the number if you need to.

      Race Heat Calculator This online calculator generates grid positions for specified number of heats and entrants of kart racing. It tries to make them as fair as it could by harnessing computer processing power to find best combinations.

      Random Matrix Generator The matrix generator calculator is a tool that allows the user to generate a random matrix with specific parameters. The user can specify the dimensions of the matrix, the range of values for the matrix elements, and the type of values, either integers or floating-point numbers. The matrix can then be downloaded as a CSV file, with the user able to choose the separator symbol used.

      Random Number Sequence Generator The calculator generates an ordered sequence of numbers from a given range. For example, the order in which the numbers are drawn in a lotto - numbers from 1 to 90 will be listed in random order, or a lottery like 5 out of 36.

      Roman Arithmetic Calculator Roman Arithmetic Calculator allows users to perform arithmetic operations on Roman numerals. It can be particularly useful for historians, classicists, or anyone interested in ancient history or mathematics.

      Root and power This calculator outputs desired root and power of entered number

      Runge–Kutta method This online calculator implements the Runge-Kutta method, a fourth-order numerical method to solve the first-degree differential equation with a given initial value.

      Scientific Notation Converter This calculator converts a number to the normalized scientific notation, also known as standard form.

      Second, third, and other derivatives Evaluates first, second third and other derivatives of a single argument function

      Sequence Range Finder The "Sequence Range Finder" calculator analyzes integer number sequences and prints all continuous ranges it detects.

      Solving limit problems using L'Hospital's Rule Solving 0/0 and ∞/∞ limit problems using L'Hospital's Rule.

      Spiral calculator This online calculator computes unknown archimedean spiral dimensions from known dimensions. The spiral dimensions include: outer diameter, inner diameter, separation distance (distance between arms, thickness), spiral length, number of turnings

      Student t-distribution Calculates cumulative distribution function value and probability density function value for Student t-distribution. Quantile calculator evaluates Student quantiles for given probability and specified number of degrees of freedom.

      Sum of Partial Sums of Arithmetic Sequence This online calculator calculates partial sums of an arithmetic sequence and displays the sum of partial sums.

      Sum of Partial Sums of Geometric Sequence This online calculator calculates partial sums of geometric sequence and displays sum of partial sums.

      Surface area of a cube

      Tank volume Calculator computes tank volume given its length, diameter and walls depth. Created by user's request.

      The General Solution of a System of Linear Equations using Gaussian elimination This online calculator solves a system of linear algebraic equations using the Gaussian elimination method. It produces the result whether you have a unique solution, an infinite number of solutions, or no solution. It also outputs the result in floating point and fraction format.

      The Greatest Common Divisor (GCD) and the Least Common Multiple (LCM) of several numbers This calculator finds the Greatest Common Divisor (GCD) and the Least Common Multiple (LCM) of two or more integers by performing prime factorization

      The Polar to Cartesian Coordinate Converter The Polar to Cartesian Coordinate Converter is an online tool that converts polar coordinates to Cartesian coordinates and vice versa.

      The difficulty of calculating school math examples This calculator gives an estimate of the difficulty of calculating math examples. It can be used for comparative estimation of the difficulty math problems.

      The greatest common divisor of two integers This calculator determines the greatest common divisor of two integers using Euclidean algorithm

      Time Series Decomposition This online calculator decomposes time series by extracting seasonality and trend from data

      Tips and tricks #12: Long (infinite) calculations This article describes how to perform long or infinite calculations while allowing user to stop them

      Tips and tricks #8: How to reuse existing calculator This article describes process of reusing another calculator's logic (algorithm) in your calculator.

      Tips and tricks #9: Big numbers How to use big number input and PCR library.

      Torus Calculator Calculate the surface area and volume of a torus based on its radius and tube radius.

      Urn probability simulator This calculator simulates the urn (or box with colored balls) often used for probability problems, and can calculate probabilities of different events.

      Volume of geometric shapes Calculates volume of geometric shapes: cube, prism, pyramid, frustum, cone, cylinder, sphere, ellipsoid.

      Z-score / Standard score This online calculator computes the standard score of a raw score from the given mean of the population and the standard deviation of the population.

      Сomputer algebra Derives a formula from input formulas and input data to calculate remained parameters

  • Physics

    • Acceleration of gravity Acceleration of gravity calculation on the surface of a planet. It's possible to calculate the acceleration above the surface by setting the sea level. But it won't be possible under the surface - this is a wrong formula.

      Altitude Boiling Point Calculator This online calculator calculates the boiling temperature of water based on the atmospheric pressure in millimeters of mercury or the altitude above the sea level.

      Altitude Pressure Calculator Calculate the pressure at a given altitude using the barometric formula. Adjust the sea level pressure, temperature, and altitude to obtain the altitude pressure value.

      Altitude difference by barometric formula This calculator calculates the height or altitude difference between two points using barometric formula or barometric leveling method.

      Angular velocity and linear velocity This online calculator converts angular velocity to linear velocity for given radius

      Apparent temperature This online calculator computes the apparent temperature, taking into consideration wind speed and relative air humidity. It uses the Australian Bureau of Meteorology formula

      Average Compressibility Factor, (dimensionless) Is the average compressibility factor of the gas flowing through the pipeline

      Average Pressure, psia This is the average pressure in the pipe

      Average Temperature, °R Average temperature in the pipeline

      Balloon lifting force Online calculator for solving problems related to balloon lifting force. It allows you to find the mass of the balloon shell, or the mass of the payload, or the required hot air temperature, or the volume of the balloon, from other known values.

      Battery discharge time depending upon load This article contains online calculators that can work out the discharge times for a specified discharge current using battery capacity, the capacity rating (i.e. 20-hour rating, 100-hour rating etc) and Peukert's exponent.

      Buoyant Force Calculator - Weight of Displaced Liquid This online tool allows you to calculate the buoyant force and weight of the liquid displaced by a submerged object in water.

      CaCl2 ppm to chlorides WPS ppm converter This online calculator converts given CaCl2 ppm concentration into chlorides water phase salinity ppm concentration

      Calculation of fluid flow rate as it flows out of the orifice at constant head. This online calculator calculates the flow rate of a liquid as it flows through a small opening in a thin wall at a constant liquid level (head) in the tank.

      Capacitor in Direct Current Circuit These online calculators computes various parameters for charging and discharging the capacitor with the resistor

      Celsius to Fahrenheit calculator explained

      Centripetal Force Solver The Centripetal Force Calculator is a tool for students, designed to help calculate the unknown parameters in the centripetal force formula.

      Change in volume of liquid under pressure (compressibility) This online calculator calculates the change in volume of a liquid as a function of pressure using the compressibility coefficient

      Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure. Clapeyron-Mendeleev equation. The relationship between the number of moles of gas, the temperature, volume and pressure.

      Complementary color This calculator shows complementary colors for entered colors

      Conversion of kilograms of gas to cubic meters of gas and vice versa When filling domestic gas cylinders with liquefied propane, propane is dispensed by weight, in kilograms. This online calculator calculates the volume of gas in cubic meters by the weight of gas in kilograms and vice versa.

      Coulomb's Law Calculator - Solve for Force, Charge, or Distance Calculate unknown values (force, charge, or distance) using Coulomb's law scalar formula with this online calculator. Solve physics problems with ease.

      Density of air as a function of pressure and temperature This online calculator calculates the air density value for a given pressure and temperature using the Mendeleev-Clapeyron equation for an ideal gas.

      Determining air humidity with the psychrometric method This calculator determines air humidity using psychrometric method with two thermometers.

      Dew Point Calculator This calculator determines the dew point from a given temperature and relative humidity of the air.

      Direct measurement error analysis Calculates error of direct measurements for given measured value series and confidence interval.

      Dynamics. Acceleration of an resultant force This online calculator illustrates the solution of the example problem on dynamics.

      Electrical conductivity and total dissolved solids This online calculator converts the electrical conductivity of water to total dissolved solids in ppm using the specified conversion factor

      Electricity, Work, and Power This online calculator can help you solve the problems on work done by the current and electric power. It can calculate current, voltage, resistance, work, power and time depending on what variables are known and what are unknown

      Energy Unit Converter: Joules, Kilowatt-Hours, Kilogram-Force per Meter, Horsepower per Hour, Kilocalories This is an energy units converter calculator that can convert between joules, kilowatt-hours, kilogram force per meter, horsepower per hour, and kilocalories.

      Freefall distance problems solver This calculator solves problems on passed distance during freefall

      Gas concentration from ppm to mg/m³ and vice versa This online calculator converts the gas concentration value from ppm to mass concentration and back taking into account temperature and pressure

      Gravity Pressure Calculator This online calculator computes pressure caused by a given mass over a given surface in a gravity field.

      Humidification Load Calculator - Find the Perfect Humidifier This online calculator calculates the humidification requirements for your space by determining the volume of air to be humidified and the amount of water to be added per hour, helping you choose the right humidifier.

      Hydrostatic pressure This online calculator can solve hydrostatic pressure problems by finding unknown values in the hydrostatic equation.

      Kinematic Equations for Constant Acceleration Calculator This kinematics calculator will help you to solve constant acceleration problems using kinematic equations

      Kinematics. Average Speed Problem Example Here is the nice example of the average speed problem

      Lifting force of a helium-filled balloon Online calculator for solving problems related to the lifting force of a helium-filled balloon. It allows you to find the mass of the balloon shell, or the mass of the payload, or the required helium mass, from the other known values.

      Normal force This online calculator calculates the normal force's strength from the object's mass, the gravitational field strength, and the inclined surface's angle measured from the horizontal.

      Ohm's law This calculator determines current by voltage and resistance using ohm law

      Percentage of metals in the alloy This online calculator uses the characteristics of the alloy of two metals - mass and volume - to calculate the percentage of metals in the alloy based on their densities.

      Petroleum product density Petroleum product density conversion, according to GOST 3900-85

      Power into torque, and vice versa This online calculator turns power into torque and vice versa

      Projectile Motion Calculator Calculation of Unknown Parameters of Projectile Motion

      Quantity of heat This calculator can find missing values in the relationship between heat and temperature: heat added or removed, specific heat, mass, initial temperature and final temperature.

      Relative humidity to absolute humidity and vice versa calculators The first calculator converts relative humidity to absolute humidity for a given temperature and barometric pressure. The second calculator does the opposite - converts absolute humidity to relative humidity for a given temperature and barometric pressure. Some theory and formulas can be found below the calculator.

      Saturation vapor pressure This online calculator computes saturation vapor pressure for a given temperature and atmospheric (barometric) pressure

      Simple beam support reaction The calculator gives support reactions of the simple beam under various vertical load.

      Sound Doppler Shift Calculator he Doppler Effect calculator for sound waves calculates the observed frequency and wavelength of a sound wave given the source frequency, speed of source, and speed of sound in the air.

      Space object velocity It calculates the circular orbital velocity, escape velocity and planetary system escape velocity for the given planet parameters.

      Surface tension. Weight and volume of the drop of liquid This online calculator calculates the weight and the volume of the drop given the surface tension, diameter of the capillary tube, and density of the liquid

      Temperature Scale Converter This online calculator allows users to convert temperature values between the seven most widely used temperature scales. These scales are Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Réaumur, and Rømer.

      The Speed of Sound Calculator for Ideal Gases The Speed of Sound Calculator for Ideal Gases is an online tool designed to calculate the speed of sound in an ideal gas based on the provided parameters.

      The waves and the wind. Calculation of wave characteristics Calculation of wave characteristics

      The waves and the wind. Wave height statistical forecasting Predicting the height of the waves depending on the wind strength

      Thermodynamics – calculator for solving mixing problems An online calculator to solve thermodynamic equilibrium problems, such as finding the final temperature when mixing fluids, or finding the required temperature for one of the fluids to achieve a final mixed temperature

      Tips and tricks #5: How to show/hide input and output controls in a calculator This article describes how to control visibility of input and output controls in a calculator

      Torricelli's formula (kinematics) This online calculator uses Torricelli's kinematic formula, which establishes a relationship between the final velocity of a body moving straight ahead with constant acceleration, its initial velocity, the amount of acceleration, and the distance traveled to find the unknown from the three known values.

      Velocity in Uniformly Accelerated Motion in relativistic mechanics The initial velocity is assumed to be 0. The final velocity cannot exceed the speed of light.

      Vertical Collision Kinematics Calculator Calculate the time and height at which two bodies, thrown vertically upward one after the other with the same speed, will collide.

      Volume of body given the buoyant force This calculator computes the volume of body given the buoyant force and density of the body, assuming that the buoyant force equals gravity force.

      Wavelength Calculator The calculator requires you to input any two of the following three parameters: wave speed, frequency (or wave period) and wavelength. Once you input two parameters, the calculator will calculate the remaining one and display the result.

      Wind Chill Index This online calculator computes Wind Chill Index using Wind Chill Formula from Environment Canada

      Wind Energy and Wind Power Calculator Calculate the kinetic energy of wind and wind power based on given parameters.

      p-t Graph Analysis This online calculator analyses position vs time table, which is often used to describe 1-D kinematics motion.

      Сonstant acceleration This online calculator solves problems with constant acceleration. It finds unknown parameter, either initial velocity, final velocity, time or acceleration, from known parameters.

  • Others

    Calculation of geometric characteristics of flat sections of simple shapes This online calculator calculates static moments, moments of inertia and radii of inertia for flat cross sections of simple shapes

    Conversion between Gauss planar rectangular coordinates and geographic coordinates and vice versa The page contains online calculators for converting from geographic coordinates to Gauss planar rectangular coordinates and back (the formulas for the Krasovsky reference ellipsoid are used).

    Grade Goal Calculator This online calculator allows students to input their current grades for each course and displays the current average. It then calculates the number of B's needed to reach a B, if the current average is below a B, as well as the number of A's needed to reach both a B and an A.

    PSAT/NMSQT Practice Tests Score Calculator This calculator helps you to score your official practice tests results.

    Run-length encoding This online calculator compresses the entered string using the run-length encoding (RLE) method.

    Selecting a specified number of rows from the list randomly This calculator allows you to pick a selection of strings from a list at random. You can select with or without repeats. The calculator uses a random number generator built into Javascript.

    Sort and Remove: A String Sorting and Deduplication Calculator This calculator takes a list of strings as input and sorts them either in ascending or descending order based on the user's preference. Additionally, the calculator has an option to remove any duplicate strings in the input list before performing the sort.

    Universal High School GPA Calculator This online calculator lets you figure out your high school GPA. Even more, it provides you with editable conversion tables and weights, so you can tweak calculations in case you need it.

    Weighted grade calculator This online calculator calculates the weighted average of the grades entered with weights. For comparison, the average grade is also displayed.