Mile per Hour to Kilometer per Hour Conversion
Convert between Mile per Hour and Kilometer per Hour quickly and accurately.
How to Convert Mile per Hour to Kilometer per Hour
Conversion Formula
Example
Convert 15 mph to km/h:
Unit Information
Learn about the speed units you're converting between
Mile per Hour
mph
Definition
The mile per hour is a unit of speed expressing the number of statute miles traveled in one hour. It is primarily used in the United States, United Kingdom, and other countries that have not fully adopted the metric system for everyday measurements.
History/Origin
Mile per hour has its origins in the British Imperial system and was widely used in the British Empire. It became the standard speed unit in the United States and remains the primary unit for road traffic, aviation, and weather reporting in these countries.
Current Use
Mile per hour is used for speed limits, speedometers, weather reports, and aviation in the US, UK, and other imperial system countries. It is also commonly used in sports, particularly in motorsports and athletics in these regions.
Multiplier
0.447
Offset
0
Kilometer per Hour
km/h
Definition
The kilometer per hour is a unit of speed expressing the number of kilometers traveled in one hour. It is commonly used for measuring vehicle speeds, wind speeds, and general transportation velocities in most countries worldwide, except the United States.
History/Origin
Kilometer per hour became widely adopted with the metric system in the 19th century, particularly in Europe and other metric countries. It replaced various regional speed measurements and became the standard for road signs, speedometers, and official speed limits.
Current Use
Kilometer per hour is the primary speed unit for road traffic, aviation, maritime navigation, and weather reporting in metric countries. It is used on speedometers, road signs, weather forecasts, and in transportation planning and safety regulations.
Multiplier
0.278
Offset
0
Mile per Hour to Kilometer per Hour Conversion Table
| Mile per Hour [mph] | Kilometer per Hour [km/h] |
|---|---|
| 1 mph | 1.609344 km/h |
| 10 mph | 16.09344 km/h |
| 25 mph | 40.2336 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.9344 km/h |
| 0 mph | 0E+0 km/h |
| -10 mph | -16.09344 km/h |
| -40 mph | -64.37376 km/h |
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