This calculator is based on the 1976 model of the U.S. Standard Atmosphere (NASA-TM-X-74335).

# Tag: standard atmosphere

## Airspeed Conversions (CAS/EAS/TAS/Mach)

The AeroToolbox airspeed conversion tool allows you to quickly convert between Calibrated Airspeed (CAS), Equivalent Airspeed (EAS), True Airspeed (TAS) and Mach number (M). You need to specify the **altitude** at which you would like to perform the calculation as well as **any one of the four airspeeds** stated above. Use the sliders to select an input speed and whether to apply a temperature deviation offset from the standard atmospheric value. The model is based on the US Standard Atmosphere of 1976.

Further information about the various aeronautical airspeeds quoted as well as the equations used in the mathematical model are presented below the calculator.