km/h to mph Converter
1 kilometre per hour = 0.621371 miles per hour.
Enter a value
Result
1 kilometre per hour =
0.621371 mph
1 km/h × 0.621371 = 0.621371 mph
1 mph = 1.609344 km/h exactly
The working
- 1. Convert 1 km/h to metre per seconds: 1 × 0.277778 = 0.277778.
- 2. Convert to mph: 0.277778 ÷ 0.44704 = 0.621371.
1 km/h in every unit
Typical speeds
- Walking
- 5 km/h
- Cycling
- 20 km/h
- Motorway limit (UK)
- 70 mph
- Speed of sound
- 1,235 km/h
Conversion table
Kilometres per hour to Miles per hour
| Kilometres per hour | Miles per hour |
|---|---|
| 10 | 6.2137 |
| 20 | 12.427 |
| 30 | 18.641 |
| 40 | 24.855 |
| 50 | 31.069 |
| 60 | 37.282 |
| 70 | 43.496 |
| 80 | 49.71 |
| 90 | 55.923 |
| 100 | 62.137 |
| 110 | 68.351 |
| 120 | 74.565 |
| 130 | 80.778 |
| 150 | 93.206 |
| 200 | 124.27 |
Miles per hour to Kilometres per hour
| Miles per hour | Kilometres per hour |
|---|---|
| 10 | 16.093 |
| 20 | 32.187 |
| 30 | 48.28 |
| 40 | 64.374 |
| 50 | 80.467 |
| 60 | 96.561 |
| 70 | 112.65 |
| 80 | 128.75 |
| 90 | 144.84 |
| 100 | 160.93 |
| 110 | 177.03 |
| 120 | 193.12 |
| 130 | 209.21 |
| 150 | 241.4 |
| 200 | 321.87 |
Formula and worked example
miles per hour = kilometres per hour × 0.6213711922 (1 mph is exactly 1.609344 km/h).
Convert 100 kilometres per hour to miles per hour: 100 × 0.62137119 = 62.1371 mph.
When you need this
Speed limits, car performance figures and cycling data use km/h in most countries but mph in the UK and US. Drivers crossing borders and anyone comparing car reviews need it.
Questions people ask
How many miles per hour are in a kilometre per hour?
One kilometre per hour is 0.62137119 miles per hour. 1 mph is exactly 1.609344 km/h.
How do I convert kilometres per hour to miles per hour?
Multiply the number of kilometres per hour by 0.62137119, or divide by 1.609344.
What is 80 km/h in mph?
80 kilometres per hour is 49.7097 miles per hour.
How do I convert miles per hour back to kilometres per hour?
Multiply by 1.609344: one mile per hour is 1.609344 kilometres per hour.
Related conversions
How we calculate this
We use the standard published formula or definition for this calculation, and we show the working so you can check it. Source: NIST Special Publication 811, Guide for the Use of the International System of Units.
Spotted a mistake? Tell us and we'll check it. How we check our calculators