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 hour?

Kilometre per hour is a unit of speed equal to one kilometre travelled in one hour. It is the most widely used unit for road speed limits, vehicle speedometers, and wind speeds in metric countries.

Worked examples

1 mach (approx at sea level) = 1,225.0439999 kilometre per hour

1 kilometre per hour = 0.27777778 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).