Miles per hour to kilometers per hour (mph to km/h)
The answer, the exact formula and a table with the values people look up most.
1 mph = 1.60934 km/h1 km/h = 0.621371 mphKilometers per hour = Miles per hour × 1.609344Example: 45 mph = 72.4205 km/h
1 mph = 1.609344 km/h
Conversions people ask for most
Convert miles per hour to kilometers per hour
| mph | km/h |
|---|---|
| 5 mph | 8.0467 km/h |
| 10 mph | 16.093 km/h |
| 15 mph | 24.14 km/h |
| 20 mph | 32.187 km/h |
| 25 mph | 40.234 km/h |
| 30 mph | 48.28 km/h |
| 35 mph | 56.327 km/h |
| 40 mph | 64.374 km/h |
| 45 mph | 72.42 km/h |
| 50 mph | 80.467 km/h |
| 55 mph | 88.514 km/h |
| 60 mph | 96.561 km/h |
| 65 mph | 104.61 km/h |
| 70 mph | 112.65 km/h |
| 75 mph | 120.7 km/h |
| 80 mph | 128.75 km/h |
| 100 mph | 160.93 km/h |
The factor is exact: it comes from the official definition of the units. The table rounds to a few decimals; the converter above gives up to 10 significant digits.
The two units
Mile per hour mph
Miles per hour is the speed unit on road signs in the United States and the United Kingdom.
Kilometer per hour km/h
Kilometers per hour is the speed unit on road signs in most countries.
Frequently asked questions
How many kilometers per hour are 45 miles per hour?
45 mph = 72.4205 km/h.
What is the formula to convert miles per hour to kilometers per hour?
Kilometers per hour = Miles per hour × 1.609344. 45 mph = 72.4205 km/h.
Is this conversion exact?
Yes. The factor comes from the international definition of both units, so the only difference you may see is rounding.