Convert miles per hour to kilometers per hour instantly. Enter any mph value to get the exact km/h equivalent, plus the formula and a full reference table.
The factor 1.60934 comes from the exact definition of a mile:
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 5 mph | 8.05 km/h |
| 10 mph | 16.09 km/h |
| 20 mph | 32.19 km/h |
| 30 mph | 48.28 km/h |
| 40 mph | 64.37 km/h |
| 50 mph | 80.47 km/h |
| 60 mph | 96.56 km/h |
| 70 mph | 112.65 km/h |
| 80 mph | 128.75 km/h |
| 100 mph | 160.93 km/h |
60 mph equals approximately 96.56 km/h. A quick rule of thumb: multiply mph by 1.6 to get a close km/h estimate (60 × 1.6 = 96).
100 mph equals approximately 160.93 km/h. This is a common speed reference when comparing US highway speeds with international speed limits.
70 mph equals approximately 112.65 km/h. The UK national speed limit of 70 mph corresponds to about 113 km/h, which is why some European highway speed limits are set at 110 or 120 km/h.
To roughly convert mph to km/h in your head, multiply by 1.6. For example: 50 mph × 1.6 = 80 km/h (exact: 80.47 km/h).