Kilometer per Hour to Mile per Hour Conversion
Convert between Kilometer per Hour and Mile per Hour quickly and accurately.
How to Convert Kilometer per Hour to Mile per Hour
Conversion Formula
Example
Convert 15 km/h to mph:
Unit Information
Learn about the speed units you're converting between
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
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 to Mile per Hour Conversion Table
| Kilometer per Hour [km/h] | Mile per Hour [mph] |
|---|---|
| 1 km/h | 0.621371 mph |
| 10 km/h | 6.213712 mph |
| 25 km/h | 15.53428 mph |
| 50 km/h | 31.06856 mph |
| 100 km/h | 62.137119 mph |
| 0 km/h | 0E+0 mph |
| -10 km/h | -6.213712 mph |
| -40 km/h | -24.854848 mph |
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