Convert miles per hour to kilometres per hour
1 mph = 1.6 km/h. Type any value below for an instant conversion.
10 mph = 16.1 km/h
Formula
km/h = mph × 1.609344Worked example: 55 mph × 1.609344 = 88.5 km/h
US highway limits of 65–70 mph are 105–113 km/h. Rental cars abroad show the unfamiliar unit on the outer dial of the speedometer, which is worth checking before setting off.
miles per hour to kilometres per hour conversion table
| miles per hour (mph) | kilometres per hour (km/h) |
|---|---|
| 10 mph | 16.1 km/h |
| 20 mph | 32.2 km/h |
| 25 mph | 40.2 km/h |
| 30 mph | 48.3 km/h |
| 40 mph | 64.4 km/h |
| 50 mph | 80.5 km/h |
| 55 mph | 88.5 km/h |
| 60 mph | 96.6 km/h |
| 65 mph | 104.6 km/h |
| 70 mph | 112.7 km/h |
| 80 mph | 128.7 km/h |
| 100 mph | 160.9 km/h |
Frequently asked questions
How many kilometres per hour are in one miles per hour?
One miles per hour equals 1.6 kilometres per hour.
How do I convert miles per hour to kilometres per hour?
Multiply the number of miles per hour by 1.609344. For example, 55 mph × 1.609344 = 88.5 km/h.
Is this mph to km/h conversion exact?
The conversion factor of 1.609344 is used at full floating-point precision and rounded only for display, so the result is accurate for scientific, engineering and everyday use.
What is the reverse conversion?
To go the other way, use the km/h to mph converter. The reverse factor is 0.6213711922.
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