Home / Speed Conversion / Convert mph to kph

Convert mph to kph

Please provide values below to convert mile/hour [mi/h] to kilometer/hour [km/h], or vice versa.



Definition: The unit miles per hour (symbol: mph) is a measurement of speed in the imperial and United States customary systems. It expresses the number of statute miles traveled over the period of one hour. One mph equals exactly 1.609344 kilometers per hour (km/h).

Current use: Along with km/h, mph is most typically used in relation to road traffic speeds. It is most widely used in the United States, the United Kingdom, and their related territories. It is also used in the Canadian rail system, though the Canadian road systems use km/h.


Definition: The unit kilometers per hour (symbol: km/h) is a unit of speed expressing the number of kilometers traveled in one hour.

History/origin: The unit of kilometers per hour is based on the meter, which was formally defined in 1799. According to the Oxford English Dictionary, the term kilometer first came into use in 1810. It was not until later in the mid-late 19th century however, that the use of kilometers per hour became more widespread; the myriametre (10,000 meters) per hour was preferred for expressing speed.

Current use: Km/h is currently the most commonly used unit of speed around the world and is typically used for car speeds and road signs. It is also common for both miles per hour as well as kilometers per hour to be displayed on car speedometers. There are many abbreviations for the unit kilometers per hour (kph, kmph, k.p.h, KMph., etc.), but "km/h" is the SI unit symbol.

Mile/hour to Kilometer/hour Conversion Table

Mile/hour [mi/h]Kilometer/hour [km/h]
0.01 mi/h0.01609344 km/h
0.1 mi/h0.1609344 km/h
1 mi/h1.609344 km/h
2 mi/h3.218688 km/h
3 mi/h4.828032 km/h
5 mi/h8.04672 km/h
10 mi/h16.09344 km/h
20 mi/h32.18688 km/h
50 mi/h80.4672 km/h
100 mi/h160.9344 km/h
1000 mi/h1609.344 km/h

How to Convert Mile/hour to Kilometer/hour

1 mi/h = 1.609344 km/h
1 km/h = 0.6213711922 mi/h

Example: convert 15 mi/h to km/h:
15 mi/h = 15 × 1.609344 km/h = 24.14016 km/h

Popular Speed Unit Conversions

Convert Mile/hour to Other Speed Units