Convert Kilometers per Hour to Miles per Hour
km/h to mph · speed conversion
What are kilometers per hour and miles per hour?
Kilometers per hour is the standard metric unit for vehicle speed in most countries. Miles per hour is the standard speed unit for roads in the US and UK. For reference: a brisk walk is about 5 km/h (3 mph), and highway speed is around 100 km/h (62 mph).
How to convert kilometers per hour to miles per hour
1 km/h = 0.621372 mph. To convert, multiply the number of kilometers per hour by 0.621372. For example, 5 km/h = 3.10686 mph, and 20 km/h = 12.4274 mph. To go the other way, multiply miles per hour by 1.60934 (since 1 mph = 1.60934 km/h).
Kilometers per Hour to Miles per Hour conversion table
| Kilometers per Hour (km/h) | Miles per Hour (mph) |
|---|---|
| 1 | 0.621372 |
| 5 | 3.10686 |
| 10 | 6.21372 |
| 30 | 18.6412 |
| 60 | 37.2823 |
| 100 | 62.1372 |
| 120 | 74.5646 |
FAQ
What is 1 km/h in mph?
1 km/h = 0.621372 mph. To convert any amount, multiply the number of kilometers per hour by 0.621372.
How do I convert miles per hour back to kilometers per hour?
Go the other way: 1 mph = 1.60934 km/h, so multiply miles per hour by 1.60934 to get kilometers per hour.
Is a kilometers per hour bigger than a miles per hour?
No — 1 km/h is the smaller unit, equal to 0.621372 mph (it takes 1.60934 km/h to make one mph).
Are these speed conversions exact?
They use the standard internationally-defined conversion factors. Results are rounded to six significant figures for readability, which is accurate enough for everyday and most technical use.