ONE FORMULA, ONE ANSWER
Mach Number Calculator
Compare flow speed with the local speed of sound in wind tunnels and nozzles. Choose input units and calculate one value within the stated conditions.
Inputs
Calculations run in this browser. Scientific notation such as 1.2e-3 is supported. Do not group thousands.
Result
Mach number M
Enter values and select Calculate.
M = V / a
Assumptions
Use a>0 and V≥0. The speed of sound must match the fluid temperature, composition and state. A fixed air value of 340 m/s is not valid for every condition.
Displayed values are floating-point approximations. Measurement uncertainty and design safety factors are not calculated.
Formula references and credits
NaNa Lab created the code, descriptions, icons and preview images. Text, figures and code from the linked references have not been reproduced.
Physical constants: NIST / CODATA 2022. The values of μ₀ and ε₀ are measured recommendations, not exact defining constants. Values and precision notes are in the source record.
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