Miles per hour to Kilometres per hour
Convert miles per hour to kilometres per hour (mph to km/h). 1 mph = 1.609344 km/h. Use the calculator, formula and conversion table.
How to convert miles per hour to kilometres per hour
Multiply the amount in miles per hour by 1.609344 to get kilometres per hour. The displayed factor and results are rounded to 12 significant digits.
km/h = mph × 1.609344Worked example
1 mph = 1.609344 km/h. 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.
Miles per hour to Kilometres per hour table
| Miles per hour (mph) | Kilometres per hour (km/h) |
|---|---|
| 0 | 0 |
| 1 | 1.609344 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 25 | 40.2336 |
| 100 | 160.9344 |
| 1,000 | 1,609.344 |
About this conversion
What is the formula for miles per hour to kilometres per hour?
km/h = mph × 1.609344. Multiply the amount in miles per hour by 1.609344 to get kilometres per hour. The displayed factor and results are rounded to 12 significant digits.
How do I convert back to miles per hour?
Use the kilometres per hour to miles 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.