Mach Number Calculator

Find the Mach number from speed and speed of sound.

Velocity

Speed of sound

Mach number 0.9913

Formula: M = v ÷ c

Step-by-step with your numbers:

1. Values used:

2. Velocity = 340

3. Speed of sound = 343

5. Mach number = Velocity / Speed of sound = 340 / 343 = 0.9913

Did we solve your problem today?

The Mach number expresses speed relative to the local speed of sound.

The math behind it

M = v ÷ c. M = 1 is sonic, M > 1 supersonic, M > 5 hypersonic.

340 m/s where c = 343 → Mach 0.99.

Why does c change with altitude?

It depends on temperature, which varies with altitude.