Choose a category below and convert between units quickly and accurately.
Result
1 Miles/hour = 1.60934271 Kilometers/hour
Velocity conversions from everyday speeds to supersonic Mach numbers and the speed of light.
| Miles/hour (mph) | Kilometers/hour (km/h) |
|---|---|
| 1 mph | 1.60934271 km/h |
| 2 mph | 3.21868543 km/h |
| 5 mph | 8.04671356 km/h |
| 10 mph | 16.09342713 km/h |
| 25 mph | 40.23356781 km/h |
| 50 mph | 80.46713563 km/h |
| 100 mph | 160.93427125 km/h |
| 250 mph | 402.33567813 km/h |
| 500 mph | 804.67135626 km/h |
| 1000 mph | 1609.34271253 km/h |
Formula
Kilometers/hour = Miles/hour × 1.60934271
Worked Example
Example: 5 Miles/hour = 5 × 1.60934271 = 8.04671356 Kilometers/hour
To convert Miles/hour to Kilometers/hour, multiply the Miles/hour value by 1.60934271. This factor is derived from the ratio between the two units.
Miles per hour is a unit of speed expressing the number of miles traveled in one hour. It is the standard unit for vehicle speed limits and speedometers in the United States, United Kingdom, and a few other countries.
History
Miles per hour became widely used with the advent of automobile travel in the early 20th century. The US and UK use mph for all road speed limits. The highest speed limit in the United States is 85 mph on a stretch of Texas State Highway 130.
Kilometers per hour is a unit of speed expressing the number of kilometers traveled in one hour. It is the standard unit for vehicle speed limits and speedometers in most countries worldwide.
History
Kilometers per hour became the standard road speed unit with the widespread adoption of the metric system. Most countries use km/h for speed limits on road signs and vehicle speedometers, with the notable exceptions of the United States, United Kingdom, and Myanmar.
Calculated using the latest NIST standards for physical constants and unit ratios.
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