Mach Number Calculator
Compare a velocity with the local acoustic speed and classify the result as subsonic, transonic, supersonic or hypersonic using common approximate bands.
Mach number1
RegimeTransonic
How this tool works
Mach number M = V/a, where V is object or flow velocity and a is the local speed of sound.
Example
343 m/s divided by a 343 m/s speed of sound gives Mach 1.
Common questions
Is the speed of sound always 343 m/s?
No. It varies with temperature, gas composition and thermodynamic conditions.
Are regime labels exact boundaries?
No. Subsonic/transonic/supersonic labels are engineering conventions and aerodynamic effects can begin before or after the simple cutoffs.