1 Mile per Hour equals 1.60934 Kilometers per Hour.
| Mile per Hour (mph) | Kilometer per Hour (km/h) |
|---|---|
| 0.001 mph | 0.00160934 km/h |
| 0.01 mph | 0.0160934 km/h |
| 0.1 mph | 0.160934 km/h |
| 1 mph | 1.60934 km/h |
| 2 mph | 3.21869 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.0934 km/h |
| 25 mph | 40.2336 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.934 km/h |
| 500 mph | 804.672 km/h |
| 1,000 mph | 1,609.34 km/h |
To convert Miles per Hour to Kilometers per Hour, multiply the value by 1.60934. This factor comes from the ratio of the two units' definitions: one Mile per Hour equals 1.60934 Kilometers per Hour.
For example: 1 Mile per Hour = 1.60934 Kilometers per Hour, and 10 Miles per Hour = 16.0934 Kilometers per Hour.
To convert in the reverse direction — from Kilometers per Hour to Miles per Hour — multiply by 0.621371.
Miles per hour (mph or mi/h) is the standard speed unit for road transport in the United States and the United Kingdom. All US and UK speed limit signs, speedometers, and traffic law enforcement use mph. A speed limit of 55 mph (about 89 km/h) on a US freeway and a limit of 70 mph (113 km/h) on a British motorway are familiar to drivers in those countries. Shipping and weather services in the US also use mph for wind speeds and storm movement.
In athletics, miles per hour provides intuitive benchmarks: a casual jogger runs at about 5–6 mph; a competitive runner might race a 5K at 10–11 mph; Usain Bolt's world record 100m sprint averaged just over 23 mph (37.6 km/h). Baseball pitch speeds are reported in mph — a major league fastball at 95+ mph is an elite pitch. American football field-goal kicking distances and punting trajectories are analyzed with speed in mph.
Converting between mph and km/h is a common practical need: mph × 1.609 ≈ km/h, or more roughly, mph × 1.6. A speed of 60 mph is almost exactly 96.6 km/h — close enough to 100 km/h that many drivers use 60 mph ≈ 100 km/h as a mental shorthand when driving across the US-Canada border. The exact multiplier 1.609344 comes from the definition of the statute mile as exactly 1,609.344 meters.
The kilometer per hour (km/h), sometimes written as kph, is the standard unit for vehicle speeds on roads in most countries that use the metric system. Speed limits throughout Europe, Asia, Africa, South America, and Oceania are posted in km/h: 50 km/h in towns, 100–130 km/h on highways. Automobile speedometers in these countries display km/h as the primary scale, and traffic law specifies limits in km/h.
A brisk walking pace is about 5 km/h; cycling on flat terrain is typically 15–25 km/h; a car cruising on a motorway might travel at 100–130 km/h; a commercial jet cruises at 850–920 km/h. These benchmarks make km/h intuitive for human-scale transportation. Converting to m/s is straightforward: divide by 3.6 (since 1 km/h = 1000/3600 m/s = 1/3.6 m/s).
In aviation, km/h appears on aircraft airspeed indicators in countries that use metric units for aviation, though internationally, knots are the standard for navigation. Typhoon and hurricane wind speeds are routinely broadcast in km/h by meteorological agencies in Asia and the Pacific. Train speeds — particularly for high-speed rail — are prominently communicated in km/h, with the Shanghai Maglev reaching 431 km/h and the Shinkansen networks operating at 240–320 km/h.
1 Mile per Hour equals 1.60934 Kilometers per Hour.
To convert Miles per Hour to Kilometers per Hour, multiply by 1.60934. For example, 1 Mile per Hour = 1.60934 Kilometers per Hour.
1 Kilometer per Hour equals 0.621371 Miles per Hour.