All online calculators

• Life

  • Calendar

    Age Calculate your age with minute precision

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

    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

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

    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.

    Gregorian calendar. Julian calendar. The calendar eras. The calculator convers julian calendar date to gregorian calendar date taking in account the calendar era.

    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.

    Julian Day Calculation of Julian day for given date plus some information about it

    Julian and Gregorian calendars Julian and Gregorian calendars date conversion

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

    Moonphases Moon's age and phase calculation

    Number of days in a year

    Number of working days between two dates (for Russia) Calculator calculates the number of days between the two entered dates. Taking into account weekends, holidays and weekend shifts to work days, according to the published decrees of the government of the Russian Federation.

    Old Russian (Byzantine) system of chronology Old Russian calendar - years since world creation

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

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

    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.

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

    Week number of a given date Week number of a given date. Europe (ISO 8601) standard method, US method and simple numeration method.

  • Date and Time

    Age Calculate your age with minute precision

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

    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.

    Convert days to years, months and days This online calculator convert number of days to number of years, months and days in the month.

    Date and interval Adds and subtracts a specified time interval to the specified date

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

    Date to timestamp converter This calculator converts 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 week by date This online calculator outputs day of week for given date

    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.

    Gregorian calendar. Julian calendar. The calendar eras. The calculator convers julian calendar date to gregorian calendar date taking in account the calendar era.

    How many days are there between two dates? This is simple day calculator which determines number of days between two dates.

    How many hours between two days This online calculator helps you to calculate how many hours (and minutes) between two week days, i.e., Friday at 7 a.m. until Sunday at 9 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 calculator determines number of weeks between two given dates

    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.

    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

    Julian Day Calculation of Julian day for given date plus some information about it

    Julian and Gregorian calendars Julian and Gregorian calendars date conversion

    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

    Number of working days between two dates (for Russia) Calculator calculates the number of days between the two entered dates. Taking into account weekends, holidays and weekend shifts to work days, according to the published decrees of the government of the Russian Federation.

    Old Russian (Byzantine) system of chronology Old Russian calendar - years since world creation

    Sobriety calculator This online calculator calculates how long you’ve been clean and sober down to the second.

    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 Span Calculator This online calculator computes how much time is passed between two time points, specified in hours and minutes.

    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 difference between the cities Calculates the time difference between the two cities based on the catalogue data.

    Time interval between two dates Calculate time interval between two dates

    Time units Calculator expresses time interval in different time units.

    Time zones The calculator shows the current time, universal time, and time for the selected city

    Time. Total sum Calculator sums up input time intervals

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

    Total time This calculator allows you to carry out the addition of the time - it displays the total, the average, minimum and maximum.

    Total time

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

    Use of Time Summary This calculator summarizes time for different activities entered into table

    Week number of a given date Week number of a given date. Europe (ISO 8601) standard method, US method and simple numeration method.

  • Health

    Body fat calculator - YMCA formula

    Ideal weight calculator using Body Mass Index

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

    The basal metabolic rate This calculator computes BMR calories

  Others

  Glue solution strength This online calculator can be used to find out required amount of dry glue and water to get the needed solution strength

  Ingredients. Proportional quantities This online calculator recalculates quantities of ingredients for given proportions if quantity of one ingredient has changed

  Racing laps table This is generator of lap running order for kart racing. The goal is to let each racer to try each starting position/kart in random order.

  Sobriety calculator This online calculator calculates how long you’ve been clean and sober down to the second.

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

  Tournament table The calculator performs the participant placement with two following conditions: 1) Each participant must start from each starting position. 2) Each participant must encounter every other participant.

• Professional

  • Computers

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

    Binary, inverse and complement codes Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)

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

    Conversion between any bases This calculator converts number from one numeral system to another, given both system's bases

    Conversion from decimal numeral system This calculator converts given decimal value to other positional numeral system

    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.

    Email extractor This online calculator parses emails from block of text using regular expression

    GET request string parser This parser break GET request string to the parameter-value pairs and decodes URL-encoded sequences, if needed

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

    Huffman coding This online calculator generates Huffman coding based on a set of symbols and their probabilities

    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.

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

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

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

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

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

    Simple math in any numeral system This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36

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

    Symbol frequencies table This online calculator builds symbol frequency table for a given message

    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

    Altitude Pressure This calculator uses barometric formula to find out the pressure at the given altitude

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

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

    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.

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

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

    Barometric leveling

    Binary numbers calculator This calculator supports common mathematical operations over binary numbers

    Boiling point dependence on the altitude above sea level This online calculator finds the water boiling temperature given the atmospheric pressure in millimeters of mercury.

    Calculation of the volume by weight Calculation of the volume and parameters of regular geometric figure by given mass using density of matter reference book.

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

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

    Cartesian and polar two-dimensional coordinate systems This online calculator converts polar coordinates to cartesian coordinates and vice versa.

    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

    Cylindrical tank volume Cylindrical tank volume

    Density of oil Recalculation of 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. Density of oil. The tables for recalculation" standard

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

    Determining air humidity with psychrometric method

    Direct observation error analisys Calculates error of direct measurements for given measured value series and confidence interval.

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

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

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

    Hyperbolic functions Calculation of hyperbolic functions

    Inverse Hyperbolic Functions Calculation of inverse hyperbolic functions of given argument

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

    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)

    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.

    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.

    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

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

    Number of flagstones for paving This calculator will help you to estimates number of flagstones needed for paving

    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

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

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

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

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

    Power to the People Power units converter.

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

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

    Side length of a triangle This calculator computes side length of a triangle given two sides and angle between them (law of cosines)

    Simple math in any numeral system This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36

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

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

    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

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

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

    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.

    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.

    Triangle angles for given triangle sides This calculator computes triangle angles for given triangle sides using cosine law

    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.

    Usable volume of tank This calculator find usable volume of tank, taking into account wall thickness

    Values of one-variable function This online calculator calculates values of one-variable function given function formula and set of variable values

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

    Volume of the cylinder segment Calculates volume of the cylinder segment

  • Finance

    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. Arbitrary payment Compound interest calculator with the possibilityto set all the parameters of the compound interest formula

    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

    Family budget planner The calculator helps to plan personal finances.

    Loan payment example

    Mortgage calculator

    Nominal interest rates сomparison Сalculation of the effective interest rates for a given nominals

    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 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.

    Simple Interest Calculates simple interest

    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.

    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.

  • Navigation

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

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

    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 point on the orthodrome(great circle) Calculates the distance between two point 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 across the surface vs distance through the Earth This calculator calculates distance across the surface of the Earth and distance through the Earth for given two points, then compares them.

    Distance calculator Calculates distance between two geographic coordinates using haversine formula.

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

    Flag semaphore signals The calculator converts english phrase to the flag semaphore signal sequence.

    Nautical measurement units Nautical mile, sea mile, cable

    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.

    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".

    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

    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.

    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

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

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

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

    Covariance Calculator This online calculator computes covariance between two discrete random variables

    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.

    Direct observation error analisys Calculates error of direct measurements for given measured value series and confidence interval.

    Double exponential smoothing Description and example of the double exponential smoothing

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

    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

    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 Histogram generation according to input data. The number of groups is determined by the Sturgess formula, other formulas or set manually

    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.

    Lagged scatterplot This online calculator builds scatterplot of the time series against itself offset in time

    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

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

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

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

    Pearson correlation coefficient The calculation of the correlation coefficient of two random variables

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

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

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

    Seasonal fluctuations. Seasonal indices. Constant mean method. The study of periodic (seasonal) fluctuations. Calculation of average seasonal index by constant mean method.

    Spearman's correlation coefficient Calculates Spearman's rank correlation coefficient

    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.

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

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

    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 / 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.

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

  • Telecommunications

    Flag semaphore signals The calculator converts english phrase to the flag semaphore signal sequence.

    Number of agents in 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

    Telecommunications traffic, Erlang The calculator gives telecom traffic in Erlang for given time span and total call duration.

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

  • Units converters

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

    Binary, inverse and complement codes Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)

    Cartesian and polar two-dimensional coordinate systems This online calculator converts polar coordinates to cartesian coordinates and vice versa.

    Conversion between any bases This calculator converts number from one numeral system to another, given both system's bases

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

    Conversion from decimal numeral system This calculator converts given decimal value to other positional numeral system

    Conversion of decimal number to other notations This calculator converts decimal number to binary, hexadecimal and octal notations

    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.

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

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

    Digital image size in pixels and photo print size This article is about relation between image size in pixels and photographic print size. First, it recommends photographic print size for given digital image dimensions in pixels. Second, it finds resulting pixels per inch value for 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.

    Imperial to Metric and Metric to Imperial measures of length converter

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

    Meters per second and kilometers per hour This simple calculator convert meters per second to kilometers per hour and vice versa

    Nautical measurement units Nautical mile, sea mile, cable

    Number of days in a year

    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

    Pressure units converter Calculator which converts units of pressure

• Study

  • Astronomy

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

    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.

    Julian Day Calculation of Julian day for given date plus some information about it

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

    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

    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".

  • Chemistry

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

    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.

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

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

    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.

    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 moles to grams and grams to moles. This online calculator converts to moles given grams and converts to grams given moles

    Convert moles to liters and liters to moles This online calculator converts to moles given liters of a gas at STP and converts to liters of a gas at STP given moles

    Density of oil Recalculation of 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. Density of oil. The tables for recalculation" standard

    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 molar volume of an ideal gas at different conditions (temperature and pressure)

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

  • Math

    • Algebra

      • Number theory

      • Polynomials

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

        Synthetic division A simple method of polynomial division.

      • combinatorics

        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.

        Combinations generator This online calculator generates all possible combinations of items from different sets/lists

        Combinatorics. Combinations, arrangements and permutations This calculator calculates number of combinations, arrangements and permutations for given n and m

        Combinatorics. Generator of combinations. Combinatorics. Generator of combinations of m from n.

        Combinatorics. Permutation generator from N to M with repetitions. Combinatorics. Permutation generator from N to M with repetitions.

        Combinatorics. Permutation generator from N to M without repetitions. Combinatorics. Permutation generator from N to M without repetitions

        Factoring calculator This calculator generates all pairs of factors for given integer.

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

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

        Seating chart This calculator tries to find seating chart combinations taking into account preferences of students.

        Team combinations with conditions like team roles and limits This online calculator generates all possible combinations of 11 from 22 using limiting conditions like team roles and limits

        Tips and tricks #10: Dynamic table columns This article describes how to work with dynamic columns in your calculator

        Tournament table The calculator performs the participant placement with two following conditions: 1) Each participant must start from each starting position. 2) Each participant must encounter every other participant.

      • linear algebra

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

        Cramer's Rule This online calculator solves system of linear equations using Cramer's rule and shows detailed steps of the solution

        Determinant of a matrix This online calculator computes determinant of a matrix, using it's definition

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

        Inverse of a matrix Calculating inverse matrices via adjugate matrix

        Matrix Multiplication Matrix Multiplication

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

        Matrix Transpose Matrix Transpose

        Matrix triangulation Matrix triangulation with Gauss and Bareiss methods

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

        Solution of nonhomogeneous system of linear equations using matrix inverse Solution of nonhomogeneous system of linear equations using matrix inverse

      Others

      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.

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

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

      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 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 4th degree by solving the characteristic equation.

      Eigenvector calculator This online calculator computes the eigenvectors of a square matrix up to 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)

      Factorial Online calculator computes factorial of given positive integer (up to 170!)

      Factoring calculator This calculator generates all pairs of factors for given integer.

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

      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

      Integer factorization. Trial division Integer factorization using trial division algorithm.

      Modular Multiplicative Inverse This calculator calculates modular multiplicative inverse of an given integer a modulo m

      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 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 division This calculator divides one polynomial by another polynomial.

      Polynomial multiplication This calculator multiplies two univariate polynomials.

      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.

      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.

      Solution of a system of 3 linear equations Solution of a system of 3 linear equations with 3 variables

      Solution of buckets and tank problem This online calculator find a solution to the question how to fill tank with certain amount of water using two buckets of different size

      Solution of quadratic equation Solution of quadratic equation, including complex roots

      Solving a system of equations of first degree with two unknowns This calculator solves a system of equations of first degree with two unknowns.

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

      Synthetic division A simple method of polynomial division.

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

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

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

      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 for area of a quadrilateral

      Area of a triangle This is univeral online calculator for the area of a triangle which uses different methods to find the area of a triangle, depending on your knowledge of the triangle.

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

      Ball radius calculated by volume

      Calculator of area of a triangle using Hero's formula

      Circle formulae Circle formulae

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

      Circular segment Can calculate area, arc length,chord length, height and perimeter of circular segment by radius and angle.

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

      Collinearity of points whose coordinates are given 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

      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 This online calculator computes the cross product (or vector product) and visualizes the result in a cartesian coordinate system.

      Cube

      Cylinder

      Cylindrical tank volume Cylindrical tank volume

      Distance and midpoint between two points This online calculator find distance and midpoint between two points in cartesian coordinates.

      Dot product This online calculator calculates the dot product of two vectors

      Ellipsoid Calculates ellipsoid and spheroid volume and surface area.

      Equation of a circle passing through 3 given points This online calculator finds equation of a circle passing through 3 given points

      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 a circle with given center and radius in different forms This online calculator displays equations of a circle in standard form, in parametric form and in general form given center and radius of a circle

      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

      Function graphs The calculator plots several function graphs on the single coordinate plane.

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

      Incircle of a triangle This online calculator determines the radius and area of the incircle of a triangle given the three sides

      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.

      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.

      Lengths of triangle sides given one side and two angles This online calculator determines lengths of triangle sides given one side and two angles

      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 median of a triange given triangle sides

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

      Polygon area Online calculator which calculates area of a polygon given lengths of polygon sides and diagonals which split polygon to nonoverlapping triangles

      Pythagorean theorem calculator Calculates the side length of a right triangle from two other sides using Pythagorean theorem. Created by user's request

      Rectangle area calculation by perimeter Rectangle area calculation with known perimeter and aspect ratio

      Regular polygon area from circumcircle Calculates the area of the circumcircle and of the regular polygon from radius of circumcircle and number of sides

      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

      Regular polygon. Incircle and circumcircle This online calculator determines parameters of circumcircle and incircle of a regular polygon

      Side length of a triangle This calculator computes side length of a triangle given two sides and angle between them (law of cosines)

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

      Sphere

      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

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

      Total square This calculator calculates total square as sum of squares of entered rectangles

      Total volume This calculator calculates total volume as sum of volumes of entered rectangular parallelepipeds.

      Triangle angles for given triangle sides This calculator computes triangle angles for given triangle sides using cosine law

      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.

      Two argument arc tangent 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.

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

      Volume of a sphere This online calculator can find volume of a sphere by radius, and radius by volume of a sphere

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

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

    • mathematical analysis

      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

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

    Altitude of a triangle This online calculator computes the length of a altitude of a triangle, given the lengths of edges 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 length of angle bisector given the lengths of triangle edges

    Antilogarithm Antilogarithm calculator

    Area of a quadrilateral This article lists several calculators for area of a quadrilateral

    Area of a triangle This is univeral online calculator for the area of a triangle which uses different methods to find the area of a triangle, depending on your knowledge of the triangle.

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

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

    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

    Binary, inverse and complement codes Binary, one's complement (inverse) and two's complement codes (calculator was created by user's request)

    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.

    Cartesian and polar two-dimensional coordinate systems This online calculator converts polar coordinates to cartesian coordinates and vice versa.

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

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

    Circle formulae Circle formulae

    Circular segment Can calculate area, arc length,chord length, height and perimeter of circular segment by radius and angle.

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

    Collinearity of points whose coordinates are given 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

    Combinations generator This online calculator generates all possible combinations of items from different sets/lists

    Combinatorics. Combinations, arrangements and permutations This calculator calculates number of combinations, arrangements and permutations for given n and m

    Combinatorics. Generator of combinations. Combinatorics. Generator of combinations of m from n.

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

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

    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.

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

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

    Covariance Calculator This online calculator computes covariance between two discrete random variables

    Cramer's Rule This online calculator solves system of linear equations using Cramer's rule and shows detailed steps of the solution

    Cross product calculator This online calculator computes the cross product (or vector product) and visualizes the result in a cartesian coordinate system.

    Cryptarithmetic puzzle solver This calculator is a solver of cryptarithmetic puzzles. 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 original 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

    Cylindrical tank volume Cylindrical tank volume

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

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

    Determinant of a matrix This online calculator computes determinant of a matrix, using it's definition

    Distance and midpoint between two points This online calculator find distance and midpoint between two points in cartesian coordinates.

    Dot product This online calculator calculates the dot product of two vectors

    Eigenvalue calculator This online calculator computes the eigenvalues of a square matrix up to 4th degree by solving the characteristic equation.

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

    Equation of a circle passing through 3 given points This online calculator finds equation of a circle passing through 3 given points

    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 a circle with given center and radius in different forms This online calculator displays equations of a circle in standard form, in parametric form and in general form given center and radius of a circle

    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

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

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

    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 Online calculator computes factorial of given positive integer (up to 170!)

    Factoring calculator This calculator generates all pairs of factors for given integer.

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

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

    Fraction Simplifier This online calculator simplify the entered fraction using the greatest common factor (GCF)

    Fraction to Decimal and Decimal to Fraction converter This online calculator determines the decimal value for the entered fraction and fraction value for the entered decimal

    Fraction to Percent and Percent to Fraction converter This online calculator determines the percent value for the entered fraction and the fraction value for the entered percent

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

    Function graphs The calculator plots several function graphs on the single coordinate plane.

    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 a sequence of numbers.

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

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

    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)

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

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

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

    Golden ratio This calculator determines proportions according to golden ratio

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

    Hyperbolic functions Calculation of hyperbolic functions

    Incircle of a triangle This online calculator determines the radius and area of the incircle of a triangle given the three sides

    Integer factorization. Trial division Integer factorization using trial division algorithm.

    Inverse Hyperbolic Functions Calculation of inverse hyperbolic functions of given argument

    Inverse of a matrix Calculating inverse matrices via adjugate matrix

    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)

    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.

    Lagged scatterplot This online calculator builds scatterplot of the time series against itself offset in time

    Least Common Denominator for several fractions Least Common Denominator for several fractions

    Lengths of triangle sides given one side and two angles This online calculator determines lengths of triangle sides given one side and two angles

    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)

    Levenshtein Distance Online calculator for measuring Levenshtein distance between two words

    Line equation from two points This online calculator finds the equation of a line given two points it passes through, in slope-intercept and parametric forms

    Linear Diophantine equations This calculator solves linear diophantine equations.

    Logarithm This online calculator produces the logarithm of a given number with a given base. It computes also the natural logarithm and the common logarithm (decimal logarithm).

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

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

    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

    Math worksheets generator for elementary school Random worksheets, which are generated automatically from user parameters.

    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

    Matrix Multiplication Matrix Multiplication

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

    Matrix Transpose Matrix Transpose

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

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

    Modular Multiplicative Inverse This calculator calculates modular multiplicative inverse of an given integer a modulo m

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

    Multiplication in columns Calculator shows results of multiplying in columns, can be used to check answers

    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.

    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.

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

    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

    Polygon area Online calculator which calculates area of a polygon given lengths of polygon sides and diagonals which split polygon to nonoverlapping triangles

    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 division This calculator divides one polynomial by another polynomial.

    Polynomial multiplication This calculator multiplies two univariate polynomials.

    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.

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

    Probability of given number success events in several Bernoulli trials Gives 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

    Pythagorean theorem calculator Calculates the side length of a right triangle from two other sides using Pythagorean theorem. Created by user's request

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

    Quick Sum Calculator This online calculator sums up entered integer 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.

    Random combination of numbers from specified range This calculator randomly picks several numbers from specified range.

    Regular polygon area from circumcircle Calculates the area of the circumcircle and of the regular polygon from radius of circumcircle and number of sides

    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

    Regular polygon. Incircle and circumcircle This online calculator determines parameters of circumcircle and incircle of a regular polygon

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

    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.

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

    Side length of a triangle This calculator computes side length of a triangle given two sides and angle between them (law of cosines)

    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

    Simple math in any numeral system This online calculator supports simple math (addition, subtraction, division, multiplication and power) for numbers expressed in any numeral system - binary, octal, hexadecimal, from the base 2 to base 36

    Solution of a system of 3 linear equations Solution of a system of 3 linear equations with 3 variables

    Solution of buckets and tank problem This online calculator find a solution to the question how to fill tank with certain amount of water using two buckets of different size

    Solution of nonhomogeneous system of linear equations using matrix inverse Solution of nonhomogeneous system of linear equations using matrix inverse

    Solution of quadratic equation Solution of quadratic equation, including complex roots

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

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

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

    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.

    Surface area of a cube

    Synthetic division A simple method of polynomial division.

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

    The Greatest Common Factor of several numbers This online calculator finds the greatest common factor of several numbers (two or more).

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

    The greatest common divisor and the least common multiple of two integers This calculator finds the greatest common divisor (GCD) and the least common multiple (LCM) of two integers

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

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

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

    Tips and tricks #10: Dynamic table columns This article describes how to work with dynamic columns in your calculator

    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 Volume and surface area of torus.

    Triangle angles for given triangle sides This calculator computes triangle angles for given triangle sides using cosine law

    Two argument arc tangent 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.

    Usable volume of tank This calculator find usable volume of tank, taking into account wall thickness

    Values of one-variable function This online calculator calculates values of one-variable function given function formula and set of variable values

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

    Volume of a sphere This online calculator can find volume of a sphere by radius, and radius by volume of a sphere

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

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

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

    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 Pressure This calculator uses barometric formula to find out the pressure at the given altitude

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

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

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

    Barometric leveling

    Battery discharge time depending on load This article contains online calculators which can calculate discharge times for specified discharge current using battery capacity, the capacity rating (i.e. 20 hour rating, 100 hour rating etc) and Peukert's exponent.

    Boiling point dependence on the altitude above sea level This online calculator finds the water boiling temperature given the atmospheric pressure in millimeters of mercury.

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

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

    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

    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

    Coulomb's law This online calculator calculates unknown (whether force, charge or distance) using known values using Coulomb's law scalar formula. It can be used to solve physics problems.

    Determining air humidity with psychrometric method

    Dew point This calculator determines dew point from given temperature and relative humidity of air

    Direct observation error analisys Calculates error of direct measurements for given measured value series and confidence interval.

    Doppler Effect in sound Calculation of frequency and wavelength change for a moving source

    Energy measurement units Energy unit converter (joules, kilowatt-hour, kilogram force per meter, horsepower per hour, kilocalories)

    Free fall. Distance passed task. Solution of the falling body and distance passed tasks.

    Humidification loads This online calculator answers question "how to choose" humidifier, by calculating humidification requirements given initial and target relative humidity and building parameters

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

    Kinematic Equations for Uniform Acceleration This calculator will help you to solve uniform acceleration problems using kinematic equations

    Kinematics. Throwing body up problem Kinematics problem from the Svetozarov's book for MEPI matriculates

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

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

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

    Power into Torque and vise versa This online calculator turns power into torque and vise versa

    Pressure over a surface This online calculator computes pressure, cause by given mass over given surface in gravity field. Result is displayed using different units of pressure

    Projection Calculation of unknown parameters of projection using known parameters. Parameters are duration, maximum height, distance, initial velocity and angle.

    Relative humidity to absolute humidity and vise versa calculators First calculator converts relative humidity to absolute humidity for given temperature and barometric pressure. Second calculator converts absolute humidity to relative humidity for given temperature and barometric pressure

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

    Sound Speed in Gases This online calculator computes speed of sound in an ideal gas.

    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 scales Conversion between different temperature scales

    The buoyant force This calculator computes the buoyant force and weight of the liquid displaced, given the volume of body in water

    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 mixing problem solver Online calculator to solve thermodynamic equilibrium problems, like finding final temperature when mixing fluids or finding required temperature for one of the fluids to achieve 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

    Traveling Wave Relationship The relationship of the wave frequency, wavelength and propagation velocity.

    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.

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

    Wind energy and wind power This online calculator computes kinetic energy of wind and wind power

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

  Others

  Area expression with different units Calculator expresses the given area through the different units of area measurement.

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

Others

PlanetCalc statistics

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

Accretion and discounting of annuity payments

Age calculator This calculator displays age of a person in years, months, days, and total days, given the birthday date

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).

Apartment sale tax Apartment sale tax

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

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

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

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

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.

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).

Boards to cubic meters This calculator performs conversion from the number of boards to the volume in cubic meters and vice versa

Body proportionality Calculates the body proportionality by several body parameters

Brunhald formula ideal weight calculator

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

CSV table to JSON array This online calculator converts CSV table to JSON array of objects, using given map of CSV columns to object properties.

Calculadora Blogger Post Calculadora Blogger Post

Calculation of volume in cubic meters by the size of one unit of output Calculation of volume in cubic meters by the size of one unit of output (by user's request)

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

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

Coillator 3

Comparing prices using cost per square meter This calculator helps to compare prices by calculating cost per square meter

Compound interest at certain number of days

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

Conversion between metric units of length and old Russian system of measures units of length The calculators in this article convert units of length from old Russian system of measures units to metric units and back.

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

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.

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

Daily Needs Calorie Rate

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

Deal profitability analysis Deal profitability analysis after paying taxes (VAT and income tax)

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

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

Distance between two cities Calculates the distance between the two cities. Uses the directory of geographical city coordinates for the calculation.

Dollars to rubles and vice versa by Central Bank of Russia exchange rate

Effective interest rate

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

Exotic length units Converter from exotic length units to meters

Extract domain names from URLs and count unique names This calculator extracts domain names from URLs and counts unique names

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

Figure's grace Calculation of the figure's grace index by the chest, waist, hip and thigh parameters .

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

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

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

Fuel spent in liters, fuel tanks and money Calculation of fuel spent based on the distance traveled and the average fuel consumption per 100 km, in liters, in fuel tanks and money

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

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

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.

Hack Hack the three-digit code

Hartley's formula Hartley's formula to determine the amount of information contained in a message with length n.

Heat Index This calculator calculates heat index (apparent temperature), which is used by US meteorologists to determine the human-perceived equivalent temperature, as how hot it would feel if the humidity were some other value in the shade.

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

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.

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

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

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

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

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.

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

Land tax Calculates the land tax

Large breed puppy weight gain recommendations Large breed puppy weight gain recommendations

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

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

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)

List filtering Calculator that allows you to filter the initial list with the specified multiple filters

List format Format a list using regular expressions

List intersection This calculator parses list using regular expression, then counts unique matches and lists them in decreasing order

List reverser This online calculator reverses lines of text

Lorenc formula of ideal weight

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

Matching lines with regular expression This calculator matches lines in text using regular expression. It outputs line numbers and lines, which were matched and which were not matched, separating them.

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

Miles per gallon to liters per kilometer fuel consumption converter Converts miles per gallon to liters per kilometer fuel consumption

Morse Code Morse Code translator

Morse code. Mutator Transforms text into Morse code and than changes dots and dashes into specified symbols

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

Nagler's ideal weight calculator

Network address and subnet mask (IPv4) This online calculator determines subnet parameters for given IP address and subnet mask

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.

Numbered list maker This online calculator numbers lines of text

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

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

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

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

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

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

Peptide calculator Peptide calculator

Peptide dissolution calculator Peptides dissolution calculator

Peptides dissolution calculator. Peptides dissolution calculator.

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

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

Plane angles measurement systems

Pounds to Kilogramms convertion and vice versa This online calculator can be used for convertion of kilogramms to pouns, ounces and grains as they are used in USA or UK.

Pregnancy due date Pregnancy due date Calculator by the first day of the last period

Proportionality of body — McCallum's formula

Prueba2

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

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

RGB - HSV and HSV - RGB converter This calculator converts RGB color to HSV color and vise versa

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 Latin Quote Random Latin Quote

Random Letters Generator This online generator just generates specified number of symbols, randomly selecting them from given set of symbols

Region determination by the registration plate

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

Relations between the mass, the length, the width and the area density (surface density) of the fabric This online calculator calculates the mass of the fabric given the length, the width and the area density (surface density); the length of the fabric given the mass, the width and the area density; the width of the fabric given the mass, the length and the area density; the area density given the mass, the length and the width

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

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

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.

Roman numerals Converter of Roman numbers and decimal numbers

Russian Central Bank Currency Rates Russian Central Bank Currency Rates

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

Select a phone number from the text This calculator uses regular expressions to select phone numbers from a large block of text

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

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

Simple Interest Daily Rate

Simple Moving Averageе Simple Moving Average calculation based on candles

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.

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

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

Substitution cipher breaker 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

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

Tax deductions from personal income tax

The Central Bank of Russia exchange rate difference

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 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.

The discriminant of the quadratic polynomial This online calculator calculates the discriminant of the quadratic polynomial using well-known formula and describes some properties of the roots

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

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.

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

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

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

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.

URL-encoded string decoder This converter decodes URL-encoded string (percent-encoded characters). It converts reserved characters as well as UTF-8 characters

Unique words count The calculator counts number of unique words in a given text. It also count number of repeated words. It also can remove all the repetitions from the text.

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.

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.

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.

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

When to drive after drinks? Calculates time weathering of alcohol in the blood to normal

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

World time Shows current time for the selected world places

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