All online calculators

• 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.

• 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

• Determinant of a matrix

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

• Determination of the baby's sex

  It's unscientific, but it surprisingly works.

• Determining air humidity with psychrometric method
• Dew point

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