Convert kilometers per hour to miles per hour
Instant, accurate km/h → mph conversion with a live converter, table and formula.
1 kilometers per hour = 0.621371 miles per hour
1 miles per hour = 1.60934 kilometers per hour
kilometers per hour to miles per hour table
| kilometers per hour (km/h) | miles per hour (mph) |
|---|---|
| 0.5 | 0.310686 |
| 1 | 0.621371 |
| 2 | 1.24274 |
| 5 | 3.10686 |
| 10 | 6.21371 |
| 20 | 12.4274 |
| 50 | 31.0686 |
| 100 | 62.1371 |
| 500 | 310.686 |
| 1000 | 621.371 |
Formula
miles per hour = kilometers per hour × 0.621371.
Example
10 kilometers per hour = 6.21371 miles per hour.
What is a kilometers per hour?
Kilometers per hour (km/h) is the metric speed unit for vehicles.
What is a miles per hour?
Miles per hour (mph) is the imperial speed unit used in the US and UK.
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 | kilometers per hour | miles per hour |
|---|---|---|
| Brisk walk | 5.4 km/h | 3.36 mph |
| Sprinting world record (avg) | 37.58 km/h | 23.35 mph |
| City speed limit (50 km/h) | 50 km/h | 31.07 mph |
| Highway cruising (100 km/h) | 100 km/h | 62.14 mph |
| Commercial jet cruise | 900 km/h | 559 mph |
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 miles per hour in a kilometers per hour?+
1 kilometers per hour = 0.621371 miles per hour.
How do I convert kilometers per hour to miles per hour?+
Enter the value in the kilometers per hour box above and the miles per hour value appears instantly. You can also type in the miles per hour box to convert the other way.
Is this km/h to mph converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.