mph to km/h
1 mile per hour is 1.60934 kilometers per hour.
- To convert miles per hour to kilometers per hour, multiply the number of miles per hour by 1.60934.
- Going the other way, 1 kilometer per hour is 0.621371 miles per hour.
- For example, 45 miles per hour is 72.42 kilometers per hour.
Conversion
mph → km/h
72.42048
45 mph equals this many km/h
Pre-filled for this page. Open the full Unit Converter for every option.
| mph (mph) | km/h (km/h) |
|---|---|
| 5 | 8.05 |
| 10 | 16.09 |
| 15 | 24.14 |
| 20 | 32.19 |
| 25 | 40.23 |
| 30 | 48.28 |
| 35 | 56.33 |
| 40 | 64.37 |
| 45 | 72.42 |
| 50 | 80.47 |
| 55 | 88.51 |
| 60 | 96.56 |
| 65 | 104.61 |
| 70 | 112.65 |
| 75 | 120.7 |
| 80 | 128.75 |
About miles per hour and kilometers per hour
One mile per hour is exactly 1.609344 km/h, because the mile is defined as 1,609.344 meters. Common U.S. speed limits from 25 to 75 mph span about 40 to 121 km/h.
Frequently asked questions
- How many kilometers per hour are in a mile per hour?
- There are 1.60934 kilometers per hour in one mile per hour. To convert miles per hour to kilometers per hour, multiply the number of miles per hour by 1.60934.
- How do I convert 45 miles per hour to kilometers per hour?
- Multiply 45 by 1.60934: 45 miles per hour is 72.42 kilometers per hour.
- How fast is 70 mph in km/h?
- 70 mph is 112.65 km/h.