What is mach (approx at sea level)?

Mach is a dimensionless speed unit expressing the ratio of an object’s speed to the local speed of sound. At sea level, Mach 1 is approximately 343 m/s. It is used in aviation and aerodynamics to characterise high-speed flight regimes.

What is kilometre per second?

Kilometre per second is a unit of speed equal to 1,000 metres per second. It is used in astrophysics, rocket propulsion, and the measurement of planetary and cosmic velocities.

Worked examples

1 mach (approx at sea level) = 0.34029 kilometre per second

1 kilometre per second = 1,000 metre per second

More Speed conversions

• Convert mach (approx at sea level) to metre per second
• Convert mach (approx at sea level) to kilometre per hour
• Convert mach (approx at sea level) to mile per hour
• Convert mach (approx at sea level) to knot
• Convert mach (approx at sea level) to foot per second
• Convert mach (approx at sea level) to metre per minute
• Convert mach (approx at sea level) to kilometre per second
• Convert mach (approx at sea level) to centimetre per second
• Convert mach (approx at sea level) to mile per minute

Assumption: Mach uses an approximate sea-level reference (about 340.29 m/s).