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Number of days in a year

PLANETCALC, Days in a year

Days in a year

Enter a year here.

PBX channel number calculation

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

PLANETCALC, Telecommunication channel number calculation

Telecommunication channel number calculation

Number of devices busy simultaneously in a time unit

The failure of calls due to an insufficient number of lines being available allowed per each 100 calls

The caller percentage who immediately retries the call in case of failure

  • Parallel and perpendicular lines on a plane

    This online calculator checks lines' slopes to see if they are parallel or perpendicular

  • 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

  • Pipe cold bending. Flexure depth with main shaft.

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

  • Playfair cipher

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

  • 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.