Kilometers per hour to miles per hour
1 kilometer per hour = 0.621371 miles per hour
Type a value in kilometers per hour (km/h) to get miles per hour (mph) straight away. A kilometer per hour is smaller than a mile per hour, so the number goes down. Both units belong to speed, measured here against the meter per second.
1 km/h = 0.62137119 mph
Formula
mph = km/h × 0.62137119
One kilometer per hour is 0.62137119 miles per hour, so multiply by that factor. You can also divide by 1.60934, the number of kilometers per hour in one mile per hour. Here km/h is the value in kilometers per hour and mph is the result in miles per hour.
Worked example: 100 kilometers per hour × 0.62137119 = 62.1371 miles per hour.
Kilometers per hour to miles per hour table
| kilometers per hour (km/h) | miles per hour (mph) |
|---|---|
| 1 km/h | 0.621371 mph |
| 2 km/h | 1.24274 mph |
| 3 km/h | 1.86411 mph |
| 4 km/h | 2.48548 mph |
| 5 km/h | 3.10686 mph |
| 6 km/h | 3.72823 mph |
| 7 km/h | 4.3496 mph |
| 8 km/h | 4.97097 mph |
| 9 km/h | 5.59234 mph |
| 10 km/h | 6.21371 mph |
| 15 km/h | 9.32057 mph |
| 20 km/h | 12.4274 mph |
| 25 km/h | 15.5343 mph |
| 30 km/h | 18.6411 mph |
| 40 km/h | 24.8548 mph |
| 50 km/h | 31.0686 mph |
| 60 km/h | 37.2823 mph |
| 75 km/h | 46.6028 mph |
| 100 km/h | 62.1371 mph |
Everyday kilometers per hour in miles per hour
| What it is | km/h | mph |
|---|---|---|
| walking pace | 5 km/h | 3.10686 mph |
| a school-zone limit | 30 km/h | 18.6411 mph |
| an Indian city limit (common) | 50 km/h | 31.0686 mph |
| a highway limit | 100 km/h | 62.1371 mph |
| an expressway limit | 120 km/h | 74.5645 mph |
Quick estimate in your head
Multiply by about 0.62. For 100 km/h that gives 62 mph against an exact 62.1371 mph, an error of 0.2%.
About the units
Kilometer per hour (km/h). Used for road speed limits and car speedometers in most countries.
Mile per hour (mph). Exactly 0.44704 m/s. Used for road speeds in the US and UK.
Going the other way, 1 mile per hour is 1.60934 kilometers per hour.
Questions
How many miles per hour are in 1 kilometer per hour?
1 kilometer per hour is 0.621371 miles per hour, and 1 mile per hour is 1.60934 kilometers per hour.
How do I convert kilometers per hour to miles per hour?
Use mph = km/h × 0.62137119. For example, 100 kilometers per hour × 0.62137119 = 62.1371 miles per hour.
Is the kilometer per hour to mile per hour factor exact?
The factor comes from the unit definitions. Results here are rounded to 6 significant digits for display.
How much is an expressway limit in miles per hour?
120 km/h is 74.5645 mph.
Source for the conversion factor: NIST SP 811, Appendix B (conversion factors).
Related conversions
- miles per hour to kilometers per hour
- kilometers per hour to meters per second
- meters per second to miles per hour
- miles per hour to meters per second
- kilometers per hour to knots
- knots to miles per hour