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Compressible Flow Mach Number from Velocity Calculator

M = v / a; a = √(γRT) — local speed of sound.

Calculates the Mach number for compressible gas flow from flow velocity, specific heat ratio γ, gas constant R, and static temperature. a = √(γRT) is the speed of sound.

Daniel Oh By Daniel Oh
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

a = sqrt(γ × R × T); M = v / a; R_air = 287 J/kg·K; γ_air = 1.4

In depth

Calculates the Mach number for compressible gas flow from flow velocity, specific heat ratio γ, gas constant R, and static temperature. a = √(γRT) is the speed of sound.