Convert miles per hour to kilometers per hour
Instant, accurate mph → km/h conversion with a live converter, table and formula.
1 miles per hour = 1.60934 kilometers per hour
1 kilometers per hour = 0.621371 miles per hour
miles per hour to kilometers per hour table
| miles per hour (mph) | kilometers per hour (km/h) |
|---|---|
| 0.5 | 0.804672 |
| 1 | 1.60934 |
| 2 | 3.21869 |
| 5 | 8.04672 |
| 10 | 16.0934 |
| 20 | 32.1869 |
| 50 | 80.4672 |
| 100 | 160.934 |
| 500 | 804.672 |
| 1000 | 1609.34 |
Formula
kilometers per hour = miles per hour × 1.60934.
Example
10 miles per hour = 16.0934 kilometers per hour.
What is a miles per hour?
Miles per hour (mph) is the imperial speed unit used in the US and UK.
What is a kilometers per hour?
Kilometers per hour (km/h) is the metric speed unit for vehicles.
Real-world reference points
Walking is ~5 km/h (3 mph); city driving ~50 km/h (31 mph); a jet cruises near 900 km/h (560 mph).
| Reference | miles per hour | kilometers per hour |
|---|---|---|
| Brisk walk | 3.36 mph | 5.4 km/h |
| Sprinting world record (avg) | 23.35 mph | 37.58 km/h |
| City speed limit (50 km/h) | 31.07 mph | 50 km/h |
| Highway cruising (100 km/h) | 62.14 mph | 100 km/h |
| Commercial jet cruise | 559 mph | 900 km/h |
Mistakes to avoid with speed conversions
- Dividing instead of multiplying by 3.6 when moving between m/s and km/h.
- Assuming knots equal mph — a knot is ~15% faster (nautical miles per hour).
- Comparing GPS speed (ground speed) with a car's speedometer, which reads slightly high by design.
Frequently asked questions
How many kilometers per hour in a miles per hour?+
1 miles per hour = 1.60934 kilometers per hour.
How do I convert miles per hour to kilometers per hour?+
Enter the value in the miles per hour box above and the kilometers per hour value appears instantly. You can also type in the kilometers per hour box to convert the other way.
Is this mph to km/h converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.