Seldons
mph to kmh
1 mile per hour = 1.60934 kilometers per hour.
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How do you convert miles per hour to kilometers per hour?
Use this formula. It is exact — these units are defined by international agreement, not measured.
km/h = mph × 1.609344
Example: 10 mph × 1.609344 = 16.0934 km/h.
mph to kmh conversion table
Common values, rounded to six significant figures.
| mph | km/h |
|---|---|
| 5 mph | 8.04672 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 |
| 35 mph | 56.327 km/h |
| 40 mph | 64.3738 km/h |
| 45 mph | 72.4205 km/h |
| 50 mph | 80.4672 km/h |
| 55 mph | 88.5139 km/h |
| 60 mph | 96.5606 km/h |
| 65 mph | 104.607 km/h |
| 70 mph | 112.654 km/h |
| 75 mph | 120.701 km/h |
| 80 mph | 128.748 km/h |
| 100 mph | 160.934 km/h |
American and British speeds have to become km/h for European navigation, vehicle specs and telematics. One mph is exactly 1.609344 km/h, the same factor as miles to kilometers, because the hour cancels. A 70 mph motorway limit is 112.7 km/h — which is why European signs near 110 or 120 feel familiar but are not identical.
Values worth remembering
These come up often enough that knowing them saves a lookup.
- 60 mph = 96.5606 km/ha highway limit
- 20 mph = 32.1869 km/ha school zone
- 30 mph = 48.2803 km/han urban limit
Questions people ask
How many kilometers per hour is 1 mile per hour?
1 mile per hour is 1.60934 kilometers per hour.
How many miles per hour is 1 kilometer per hour?
1 kilometer per hour is 0.621371 miles per hour.
How do you convert miles per hour to kilometers per hour in your head?
Use × 1.6. That lands within a percent or so of the exact figure, which is close enough for packing, shipping estimates and shopping — use the calculator when the number has to be right.
Is the mile per hour to kilometer per hour conversion exact?
Yes. The relationship is exact by international agreement, so 1.609344 is a definition rather than a measurement. Rounding in the answer comes from display, not from the conversion.