Miles per hour to kilometers per hour
One mile per hour is exactly 1.609344 kilometers per hour, because a speed conversion uses the same factor as the mile itself. Type any speed below, or use the chart and shortcuts on this page.
The formula
kilometers per hour = miles per hour × 1.609344
Multiply the speed in mph by 1.609344. The result is in km/h.
Miles per hour to kilometers per hour chart
| Miles per hour | Kilometers per hour | Good to know |
|---|---|---|
| 5 mph | 8.04672 km/h | |
| 15 mph | 24.1402 km/h | |
| 25 mph | 40.2336 km/h | |
| 30 mph | 48.2803 km/h | |
| 45 mph | 72.4205 km/h | |
| 55 mph | 88.5139 km/h | Common US highway limit |
| 65 mph | 104.607 km/h | Common US highway limit |
| 70 mph | 112.654 km/h | Common US highway limit |
| 75 mph | 120.701 km/h | |
| 80 mph | 128.748 km/h |
Quick mental math
Multiply by 1.6. For 60 mph that gives 96 km/h, against an exact 96.56 km/h. To go the other way, multiply km/h by 0.62: 100 km/h is about 62 mph.
Going the other way
To convert kilometers per hour back to miles per hour, multiply by 0.621371 or divide by 1.609344.
Common questions
Which is faster, 100 km/h or 60 mph?
100 km/h. Sixty mph is about 96.6 km/h.
How do I convert km/h to mph?
Multiply by 0.621371, or divide by 1.609344.
How fast is a knot?
One knot is one nautical mile per hour, which is 1.852 km/h or about 1.15 mph.