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.

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.

Worked examples

1 kilometre per second = 2.93866996 mach (approx at sea level)

1 mach (approx at sea level) = 340.29 metre per second

More Speed conversions

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

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