Mach Number Calculator

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Choose which quantity to calculate; the other three are inputs.
How to determine the local speed of sound. "Altitude" uses the International Standard Atmosphere temperature lapse in the troposphere.
Unit used for the velocity input and output.
Speed of the moving object in the selected velocity unit.
Local air temperature. The speed of sound rises with temperature.
Altitude above sea level. The ISA model applies a lapse rate of 6.5 C per 1 000 m up to 11 000 m, then holds at -56.5 C.
Local speed of sound entered directly.
Mach numberTransonic
0.9991

Ratio of object speed to local speed of sound

Object velocity340
Speed of sound340.3m/s
Air temperature15
Flow regimeTransonic
0.9991 M
Subsonic<0.8Transonic0.8-1.2Supersonic1.2-5Hypersonic5+

Mach 0.999: Transonic flow.

  • At Mach 0.999, the object is travelling at about 340.0 m/s, with a local speed of sound of 340.3 m/s.
  • The transonic regime spans both subsonic and supersonic flow simultaneously on different parts of the body. Shock waves begin to form and wave drag increases sharply.

Next stepAt subsonic speeds, dynamic pressure (0.5 rho v^2) is the key aerodynamic loading parameter.

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