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 knot?

A knot is a unit of speed equal to one nautical mile per hour, approximately 1.852 km/h. It is the international standard for maritime navigation, aviation, and meteorological wind speed reporting.

Worked examples

1 mach (approx at sea level) = 661.47084239 knot

1 knot = 0.51444444 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).