Kilometres per hour to Miles per hour
Convert kilometres per hour to miles per hour (km/h to mph). 1 km/h = 0.621371192237 mph. Use the calculator, formula and conversion table.
How to convert kilometres per hour to miles per hour
Multiply the amount in kilometres per hour by 0.621371192237 to get miles per hour. The displayed factor and results are rounded to 12 significant digits.
mph = km/h × 0.621371192237Worked example
1 km/h = 0.621371192237 mph. Change the amount in the calculator above to use your own value.
Units and assumptions
Speed is converted through metres per second. One international mile is 1,609.344 metres and one nautical mile is 1,852 metres.
Calculator results use floating-point arithmetic and are rounded for display. The reference table below uses up to 12 significant digits.
Kilometres per hour to Miles per hour table
| Kilometres per hour (km/h) | Miles per hour (mph) |
|---|---|
| 0 | 0 |
| 1 | 0.621371192237 |
| 5 | 3.10685596119 |
| 10 | 6.21371192237 |
| 25 | 15.5342798059 |
| 100 | 62.1371192237 |
| 1,000 | 621.371192237 |
About this conversion
What is the formula for kilometres per hour to miles per hour?
mph = km/h × 0.621371192237. Multiply the amount in kilometres per hour by 0.621371192237 to get miles per hour. The displayed factor and results are rounded to 12 significant digits.
How do I convert back to kilometres per hour?
Use the miles per hour to kilometres per hour calculator to reverse this conversion. You can also use Swap units in the calculator above.
Can I use a different pair of units?
Choose another unit in the calculator, or open the speed converter to browse all supported pairs.