Speed Converter
Kilometers/hour (km/h)
Definition: Kilometers per hour (symbol: km/h) is a unit of speed, expressing the number of kilometers traveled in one hour.
History/origin: Derived from the meter and the hour, it became the most popular unit for road traffic and everyday transport measurements as the world adopted the metric system.
Current use: It is the official unit for speed limits and vehicle speedometers in most countries, including all of Europe, Asia, and the Americas (except the USA).
Miles/hour (mph)
Definition: Miles per hour (symbol: mph) is a British imperial and United States customary unit of speed, expressing the number of statute miles traveled in one hour.
History/origin: The mile per hour was established long before the metric system and was standardized during the British Empire. It remains a legacy in countries that haven't fully switched to metric road signs.
Current use: MPH is the primary unit for speed limits in the United States, the United Kingdom, and several offshore territories.
Kilometers/hour (km/h) to Miles/hour (mph) Conversion Table
| Kilometers/hour (km/h) [kmh] | Miles/hour (mph) [mph] |
|---|---|
| 0.01 kmh | 0.00621371 mph |
| 0.1 kmh | 0.06213712 mph |
| 1 kmh | 0.62137119 mph |
| 2 kmh | 1.24274239 mph |
| 3 kmh | 1.86411358 mph |
| 5 kmh | 3.10685596 mph |
| 10 kmh | 6.21371193 mph |
| 20 kmh | 12.42742385 mph |
| 50 kmh | 31.06855964 mph |
| 100 kmh | 62.13711927 mph |
| 1000 kmh | 621.37119273 mph |
How to Convert Kilometers/hour (km/h) to Miles/hour (mph)
1 kmh = 0.62137119 mph
1 mph = 1.609344 kmh
Example: convert 15 kmh to mph:
15 kmh = 15 × 0.62137119 mph = 9.32056789 mph
Did You Know?
- The fastest land animal, the cheetah, can reach a top speed of about 110 km/h in short bursts. That is faster than most cars are allowed to drive on a highway!
- The United States and the United Kingdom are among the few countries that still use Miles per Hour (mph) as the primary unit for road speed limits.