# All online calculators

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

- Cylinder
- Cylindrical tank volume
Cylindrical tank volume

- 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 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 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.

- 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.

- 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.

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