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Instant result
Enter the data and press the button to do the calculation.
Online Calculator
Mach number calculator
Compare the input speed with an estimate of the local sound speed.
Information
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Local processing
The values are processed directly in your browser.
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Free
No registration, external API or subscription required.
Frequently asked questions
What's the formula?
Mach = object speed / sound speed.
Is Mach 1 always the same speed?
No, the speed of sound varies with the conditions of the medium.
What classification does it show?
Approximate classification as subsonic, transonic, supersonic, or hypersonic.
What model do you use for sound?
Dry air, modeled as an ideal gas.