Convert Miles per Hour (mph) to Kilometers per Hour (km/h)
Miles per hour and kilometers per hour are the two most common speed units used worldwide. One mile per hour equals approximately 1.60934 kilometers per hour. This conversion is essential for drivers traveling internationally, understanding speed limits in different countries, and comparing vehicle performance specifications.
≈ 1 39/64 km/h
Conversion Formula
Reverse: mph = km/h × 0.621371
Conversion Examples
Mile per Hour to Kilometer per Hour Table
| Mile per Hour (mph) | Kilometer per Hour (km/h) | Fraction |
|---|---|---|
| 5 | 8.05 | 8 3/64 |
| 10 | 16.09 | 16 3/32 |
| 15 | 24.14 | 24 9/64 |
| 20 | 32.19 | 32 3/16 |
| 25 | 40.23 | 40 15/64 |
| 30 | 48.28 | 48 9/32 |
| 35 | 56.33 | 56 21/64 |
| 40 | 64.37 | 64 3/8 |
| 45 | 72.42 | 72 27/64 |
| 50 | 80.47 | 80 15/32 |
| 55 | 88.51 | 88 33/64 |
| 60 | 96.56 | 96 9/16 |
| 65 | 104.61 | 104 39/64 |
| 70 | 112.65 | 112 21/32 |
| 75 | 120.7 | 120 45/64 |
| 80 | 128.75 | 128 3/4 |
| 85 | 136.79 | 136 51/64 |
| 90 | 144.84 | 144 27/32 |
| 95 | 152.89 | 152 57/64 |
| 100 | 160.93 | 160 15/16 |
Unit Definitions
What is a Mile per Hour (mph)?
Miles per hour is a unit of speed expressing the number of statute miles covered in one hour. It is the standard speed unit in the United States and the United Kingdom.
History
The mile per hour became the standard speed unit in English-speaking countries as the mile became the established unit of distance. With the advent of automobiles in the early 20th century, mph became the standard for speedometers and road signs in the US and UK. Despite metrication efforts, both countries continue to use mph for road speeds.
Current Use
Miles per hour is used for road speed limits and vehicle speedometers in the United States, United Kingdom, and a few other countries. It is also used in baseball for pitching speeds and in some weather reports for wind speed.
What is a Kilometer per Hour (km/h)?
Kilometers per hour is a unit of speed expressing the number of kilometers covered in one hour. It is the most widely used speed unit for transportation worldwide.
History
Kilometers per hour became the international standard for speed measurement as countries adopted the metric system throughout the 19th and 20th centuries. The unit follows naturally from the kilometer (established in 1795 as part of the metric system) and is used on road signs in the vast majority of countries. International transportation conventions, such as those governing aviation and shipping, also reference metric speed units.
Current Use
Kilometers per hour is the standard speed unit for road transportation in most countries. Vehicle speedometers worldwide display km/h (often alongside mph). It is used for speed limits, weather wind speed reports, and athletic speed measurements in most of the world.