#icao #isa #mach #tas #cas

no-std icao-isa

An implementation of the ICAO International Standard Atmosphere(ISA) and air speed equations

2 releases

0.1.2 Feb 6, 2024
0.1.0 Feb 4, 2024

#84 in Geospatial

Download history 47/week @ 2024-02-02 15/week @ 2024-02-09 55/week @ 2024-02-16

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MIT license

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An implementation of the International Civil Aviation Organization (ICAO) International Standard Atmosphere (ISA), see ICAO Doc 7488/3.

The library also includes functions for calculating:

  • true airspeed (TAS) from calibrated airspeed (CAS), pressure and temperature;
  • CAS from TAS, pressure and temperature;
  • TAS from Mach number and temperature;
  • and the crossover altitude between CAS / Mach flight regimes.

The equations for the functions above are from BADA User Manual revision 3-12.

The library is declared no_std so it can be used in embedded applications.


If you want to contribute through code or documentation, the Contributing guide is the best place to start.
Just please abide by our Code of Conduct.


icao-isa-rs is provided under a MIT license, see LICENSE.


~33K SLoC