km/h is a unit of speed, read "kilometres per hour." An object travelling at a speed of 1 km/h would move 1 kilometre in one hour if the speed remained constant for that hour.
This unit is sometimes written kph, although in general this is casual rather than rigorous usage.
- 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 |
| 80-90 km/h | Speed limit on a major road |
| 110-120 km/h | Highway speed |
| 300 km/h | High-speed railroad |
| 1000 km/h | Airliner cruising speed |
| 40,320 km/h | Earth's escape velocity |
