Miles per hour to kilometers per hour
1 mile per hour = 1.60934 kilometers per hour
Type a value in miles per hour (mph) to get kilometers per hour (km/h) straight away. A mile per hour is larger than a kilometer per hour, so the number goes up. Both units belong to speed, measured here against the meter per second.
1 mph = 1.609344 km/h
Formula
km/h = mph × 1.609344
One mile per hour is 1.609344 kilometers per hour, so multiply the mile per hour value by that factor. Here mph is the value in miles per hour and km/h is the result in kilometers per hour.
Worked example: 60 miles per hour × 1.609344 = 96.5606 kilometers per hour.
Miles per hour to kilometers per hour table
| miles per hour (mph) | kilometers per hour (km/h) |
|---|---|
| 1 mph | 1.60934 km/h |
| 2 mph | 3.21869 km/h |
| 3 mph | 4.82803 km/h |
| 4 mph | 6.43738 km/h |
| 5 mph | 8.04672 km/h |
| 6 mph | 9.65606 km/h |
| 7 mph | 11.2654 km/h |
| 8 mph | 12.8748 km/h |
| 9 mph | 14.4841 km/h |
| 10 mph | 16.0934 km/h |
| 15 mph | 24.1402 km/h |
| 20 mph | 32.1869 km/h |
| 25 mph | 40.2336 km/h |
| 30 mph | 48.2803 km/h |
| 40 mph | 64.3738 km/h |
| 50 mph | 80.4672 km/h |
| 60 mph | 96.5606 km/h |
| 75 mph | 120.701 km/h |
| 100 mph | 160.934 km/h |
Everyday miles per hour in kilometers per hour
| What it is | mph | km/h |
|---|---|---|
| walking pace | 3 mph | 4.82803 km/h |
| a 20 mph zone | 20 mph | 32.1869 km/h |
| a UK town limit | 30 mph | 48.2803 km/h |
| a UK single-carriageway limit | 60 mph | 96.5606 km/h |
| a UK motorway limit | 70 mph | 112.654 km/h |
Quick estimate in your head
Multiply by about 1.6. For 60 mph that gives 96 km/h against an exact 96.5606 km/h, an error of 0.6%.
About the units
Mile per hour (mph). Exactly 0.44704 m/s. Used for road speeds in the US and UK.
Kilometer per hour (km/h). Used for road speed limits and car speedometers in most countries.
Going the other way, 1 kilometer per hour is 0.621371 miles per hour.
Questions
How many kilometers per hour are in 1 mile per hour?
1 mile per hour is 1.60934 kilometers per hour, and 1 kilometer per hour is 0.621371 miles per hour.
How do I convert miles per hour to kilometers per hour?
Use km/h = mph × 1.609344. For example, 60 miles per hour × 1.609344 = 96.5606 kilometers per hour.
Is the mile per hour to kilometer per hour factor exact?
The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.
How much is a UK motorway limit in kilometers per hour?
70 mph is 112.654 km/h.
Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).
Related conversions
- kilometers per hour to miles per hour
- kilometers per hour to meters per second
- meters per second to kilometers per hour
- miles per hour to meters per second
- knots to kilometers per hour
- kilometers per hour to knots