Convert miles per hour to kilometers per hour instantly. Enter a speed in mph to get the equivalent in km/h — handy for US and UK road signs, car reviews and running pace.
How to convert mph to km/h
One mile is exactly 1.609344 km, so to convert mph to km/h you multiply by 1.609344.
Formula: km/h = mph × 1.609344
Example: A 70 mph motorway limit is 70 × 1.609344 = 112.65 km/h. 30 mph in town is 48.28 km/h.
Tip: For a quick estimate, multiply by 8/5 (or 1.6): 50 mph is about 80 km/h (80.47 exactly).
| Miles per Hour (mph) | Kilometers per Hour (km/h) |
|---|---|
| 10 | 16.09344 |
| 20 | 32.18688 |
| 25 | 40.2336 |
| 30 | 48.28032 |
| 40 | 64.37376 |
| 50 | 80.4672 |
| 55 | 88.51392 |
| 60 | 96.56064 |
| 65 | 104.60736 |
| 70 | 112.65408 |
| 75 | 120.7008 |
| 80 | 128.74752 |
| 100 | 160.9344 |
Need a different unit? The Speed Converter handles every common speed unit.