Miles per hour to kilometres per hour converter
Kilometres per hour (km/h)
1 mile per hour = 1.609344 kilometres per hour
How to convert miles per hour to kilometres per hour
km/h = mph × 1.609344
Multiply the number of miles per hour by 1.609344 to get kilometres per hour. Going the other way, divide by 1.609344 (or multiply by 0.621371192237).
One mile per hour is exactly defined as 1.609344 kilometres per hour (to 12 significant figures), and one kilometre per hour is 0.621371192237 miles per hour.
Worked examples
- Convert 5 miles per hour: 5 × 1.609344 = 8.04672 8.04672 kilometres per hour.
- Convert 12.5 miles per hour: 12.5 × 1.609344 = 20.1168 20.1168 kilometres per hour.
- Convert 250 miles per hour: 250 × 1.609344 = 402.336 402.336 kilometres per hour.
Quick-reference table
| mph | km/h |
|---|---|
| 1 | 1.609344 |
| 2 | 3.218688 |
| 3 | 4.828032 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 15 | 24.14016 |
| 20 | 32.18688 |
| 25 | 40.2336 |
| 50 | 80.4672 |
| 75 | 120.7008 |
| 100 | 160.9344 |
| 1,000 | 1,609.344 |
| km/h | mph |
|---|---|
| 1 | 0.6213711922 |
| 2 | 1.242742384 |
| 3 | 1.864113577 |
| 5 | 3.106855961 |
| 10 | 6.213711922 |
| 15 | 9.320567884 |
| 20 | 12.42742384 |
| 25 | 15.53427981 |
| 50 | 31.06855961 |
| 75 | 46.60283942 |
| 100 | 62.13711922 |
| 1,000 | 621.3711922 |
Related conversions
- ⇄ Kilometres per hour to miles per hour
- Miles per hour to metres per second
- Miles per hour to knots
- Miles per hour to feet per second
- Miles per hour to kilometres per minute
- Miles per hour to centimetres per second
- Miles per hour to miles per minute
- Metres per second to kilometres per hour
- Knots to kilometres per hour
Frequently asked questions
How many kilometres per hour are in 1 mile per hour?
1 mile per hour equals 1.609344 kilometres per hour.
What is the formula to convert miles per hour to kilometres per hour?
Use km/h = mph × 1.609344. Multiply the number of miles per hour by 1.609344 to get kilometres per hour. Going the other way, divide by 1.609344 (or multiply by 0.621371192237).
What is 100 miles per hour in kilometres per hour?
100 miles per hour is 160.9344 kilometres per hour.