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 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 kilometre per second = 3,599.99999971 kilometre per hour

1 kilometre per hour = 0.27777778 metre per second

More Speed conversions

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