All online calculators

  • PBX channel number calculation

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

  • Pearson correlation coefficient

    The calculation of the correlation coefficient of two random variables

  • 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).

  • Petroleum product density

    Petroleum product density conversion, according to GOST 3900-85

  • 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.

Pipe cold bending. Flexure depth with main shaft.

Calculates the section flexure depth with pipe bender or bending machine to obtain given parameters.


Segment defined by chord and height

Digits after the decimal point: 2

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 Urn simulator

Probability Urn

Items per page:

Digits after the decimal point: 4