Online calculators to convert miles per hour to kilometers per hour (mph to km/h) and kilometers per hour to miles per hour (km/h to mph). Our conversions provide a quick and easy way to convert between these units.
Enter your value in one of the conversion calculators below to convert mph to km/h or convert km/h to mph.
The following is a list of definitions relating to conversions between miles per hour and kilometers per hour.
Miles per hour is a unit of speed in both US Customary Units as well as the Imperial System. It measures the number of miles travelled in an hour. The symbol for miles per hour is mph.
Kilometers per hour is a unit of speed in the Metric System. It measures the number of kilometers travelled in an hour. The symbol for kilometers per hour is km/h and the International spelling is kilometres per hour.
This table provides a summary of the Speed units within their respective measurement systems.
Unit | Symbol | Measurement System | Description |
---|---|---|---|
inches per hour | in/h | US Customary Units/Imperial System | |
feet per hour | ft/h | US Customary Units/Imperial System | 1 ft/h = 12 in/h |
yards per hour | yd/h | US Customary Units/Imperial System | 1 yd/h = 3 ft/h |
miles per hour | mph | US Customary Units/Imperial System | 1 mph = 1760 yd/h 1 mph = 5280 ft/h |
millimeters per hour | mm/h | Metric System | 1000 mm/h = 1 m/h |
centimeters per hour | cm/h | Metric System | 100 cm/h = 1 m/h 1 cm/h = 10 mm/h |
decimeters per hour | dm/h | Metric System | 10 dm/h = 1 m/h 1 dm/h = 10 cm/h |
meters per hour | m/h | Metric System | 1 m/h = 1000 mm/h 1 m/h = 100 cm/h 1 m/h = 10 dm/h |
kilometers per hour | km/h | Metric System | 1 km/h = 1000 m/h |