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Kilometres per hour

unit of speed, read "kilometres per hour." An object travelling at a speed of 1 km/h for an hour would move 1 kilometre.

This unit is sometimes written colloquially as kph.

• 1 km/h = 0.278 m·s^-1, the SI derived unit of speed
• 1 km/h = 0.621 mi/h = 0.911 ft/s
• 1 m/s = 3.6 km/h

Examples of speeds in km/h

5 km/h	Walking speed
20 km/h	Easy bicycling speed
50 km/h	Residential speed limit Top speed of a running cat, dog or human
80-90 km/h	Speed limit on a major road Top speed of an antelope
110-120 km/h	Highway speed Top speed of a cheetah
300 km/h	High-speed train
1000 km/h	Airliner cruising speed
1200 km/h	The speed of sound (at sea level)
1230 km/h	Current world land speed record
26,000 km/h	Re-entry speed of the space shuttle
40,320 km/h	Earth's escape velocity
300,000 km/h	Speed of light