Convert miles per hour to kilometers per hour instantly. Enter a value below, or use the formula and reference table further down the page.
In practice
Miles-per-hour to kilometres-per-hour is the conversion every driver crossing between the US or UK and the rest of the world needs. The exact factor is 1 mph = 1.609344 km/h, so 30 mph is 48.3 km/h, 60 mph is 96.6 km/h and 70 mph is 112.7 km/h. A handy mental shortcut is to multiply by 1.6 (or add 60% of the number): 50 mph is roughly 80 km/h. 'kph' and 'km/h' are the same unit, and many modern speedometers show both, but rental cars abroad often show only one, so it pays to know what your usual limits become before you set off.
How to convert miles per hour to kilometers per hour
Multiply the value by 1.609344.
km/h = mph × 1.609344Example: 10 mph = 16.0934 km/h.
Miles per hour to Kilometers per hour conversion table
| Miles per hour (mph) | Kilometers per hour (km/h) |
|---|---|
| 1 mph | 1.6093 km/h |
| 2 mph | 3.2187 km/h |
| 3 mph | 4.828 km/h |
| 4 mph | 6.4374 km/h |
| 5 mph | 8.0467 km/h |
| 10 mph | 16.0934 km/h |
| 15 mph | 24.1402 km/h |
| 20 mph | 32.1869 km/h |
| 25 mph | 40.2336 km/h |
| 50 mph | 80.4672 km/h |
| 100 mph | 160.9344 km/h |
Frequently asked questions
How many kilometers per hour is 1 mph?
1 mph equals 1.6093 kilometers per hour.
What is the formula to convert mph to km/h?
To convert mph to km/h, multiply the value by 1.609344. The full formula is: km/h = mph × 1.609344.
How do I convert kilometers per hour back to miles per hour?
Use the same calculator above and type your value into the kilometers per hour field instead — it converts in both directions. Or use the reverse formula: mph = km/h ÷ 1.609344.
Is the mph to km/h conversion exact?
The conversion factor used here (1.609344) is the standard internationally defined value. Results on this page are rounded to four decimal places for readability.