mph to km/h – convert miles per hour to kilometres per hour
Convert mph to km/h (miles per hour to kilometres per hour) to compare US-style road speeds with metric limits. This page opens the main speed converter with mph → km/h pre-selected so you can type any mph value and see it in km/h.
Open the interactive mph → km/h converter:
Use main converter (mph → km/h) or switch to km/h → mphOn the homepage you can also jump straight to m/s or knots, and the Tool Hub provides timers, alarms and a Pomodoro for long drives or study.
Quick reference: mph to km/h
The exact factor is 1 mph ≈ 1.609344 km/h, so: km/h = mph × 1.609344.
| mph | km/h (approx.) |
|---|---|
| 20 mph | 32.2 km/h |
| 30 mph | 48.3 km/h |
| 40 mph | 64.4 km/h |
| 50 mph | 80.5 km/h |
| 60 mph | 96.6 km/h |
| 70 mph | 112.7 km/h |
How to convert mph to km/h
Use either:
km/h = mph × 1.609344
or km/h = mph ÷ 0.621371
Examples:
- 30 mph × 1.609344 ≈ 48.28 km/h
- 55 mph × 1.609344 ≈ 88.51 km/h
- 70 mph × 1.609344 ≈ 112.65 km/h
Why convert miles per hour to kilometres per hour?
- Hiring a car abroad when the dashboard is in mph but signs are in km/h.
- Comparing motorway limits between different countries.
- Understanding car performance figures or top speeds listed in the opposite unit.
- Converting training plans, GPS traces or running paces between mph and km/h.
More speed converters on this site
The converter uses metres per second as the base speed unit, so all these pairs stay numerically consistent.