Convert Kilometers per hour to Miles per hour
One kilometer per hour equals 0.621371 miles per hour. Type any value to convert kilometers per hour to miles per hour instantly — with a full reference table below.
Convert Kilometers per hour to Miles per hour
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How to convert Kilometers per hour to Miles per hour
To convert kilometers per hour to miles per hour, multiply by 0.621371. One kilometer per hour equals 0.621371 mph, and one mile per hour equals 1.609344 km/h.
- Take the value in kilometers per hour — for example 7.5 km/h.
- Multiply by 0.621371 (the number of miles per hour in one kilometer per hour).
- 7.5 × 0.621371 = 4.660284 mph.
Quick mental estimate: Divide the number of kilometers per hour by 1.6 (within 0.6% of the exact answer).
Kilometers per hour to Miles per hour conversion table
| Kilometers per hour | Miles per hour |
|---|---|
| 1 km/h | 0.621371 mph |
| 5 km/h | 3.106856 mph |
| 10 km/h | 6.213712 mph |
| 20 km/h | 12.42742 mph |
| 25 km/h | 15.53428 mph |
| 30 km/h | 18.64114 mph |
| 40 km/h | 24.85485 mph |
| 50 km/h | 31.06856 mph |
| 60 km/h | 37.28227 mph |
| 70 km/h | 43.49598 mph |
| 80 km/h | 49.7097 mph |
| 100 km/h | 62.13712 mph |
| 120 km/h | 74.56454 mph |
| Miles per hour | Kilometers per hour |
|---|---|
| 1 mph | 1.609344 km/h |
| 5 mph | 8.04672 km/h |
| 10 mph | 16.09344 km/h |
| 20 mph | 32.18688 km/h |
| 25 mph | 40.2336 km/h |
| 30 mph | 48.28032 km/h |
| 40 mph | 64.37376 km/h |
| 50 mph | 80.4672 km/h |
| 60 mph | 96.56064 km/h |
| 70 mph | 112.6541 km/h |
| 80 mph | 128.7475 km/h |
| 100 mph | 160.9344 km/h |
| 120 mph | 193.1213 km/h |
About converting Kilometers per hour to Miles per hour
Kilometers per hour (km/h) and Miles per hour (mph) are both units of speed. The exact factor is 1 km/h = 0.621371 mph, so multiply by 0.621371 to go from kilometers per hour to miles per hour (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Miles per hour to Kilometers per hour converter, or the full unit converter for every unit at once.
Real-world speed in kilometers per hour and miles per hour
| Example | Kilometers per hour | Miles per hour |
|---|---|---|
| A walking pace | ≈ 5.04 km/h | ≈ 3.131711 mph |
| Usain Bolt's top speed (2009) | ≈ 44.712 km/h | ≈ 27.78275 mph |
| The UK motorway limit (70 mph) | 112.6541 km/h | 70 mph |
| The German Autobahn advisory speed (130 km/h) | 130 km/h | 80.77823 mph |
| The speed of sound (air, 20 °C) | ≈ 1,234.8 km/h | ≈ 767.2691 mph |
| An airliner at cruise | ≈ 900 km/h | ≈ 559.2341 mph |
“≈” marks typical values; the rest are defined or measured figures.
The units
Kilometres per hour — exactly 1/3.6 m/s.
Used for: Road speeds in most countries.
Miles per hour — exactly 0.44704 m/s.
Used for: Road speeds in the US and UK.
km/h, mph, ft/s and knots are all defined exactly in metres per second (a knot is one nautical mile, exactly 1,852 m, per hour).