This miles per hour to kilometers per hour converter gives you the mph to km/h result instantly, in your browser, with the exact ratio so you can verify it. 1 mile per hour is about 1.60934 kilometers per hour, and going the other way, 1 kilometer per hour is 0.621371 miles per hour. Miles per hour are an imperial unit still common in the United States and the United Kingdom; kilometers per hour are part of the metric system used in most countries.
To convert by hand, multiply the number of miles per hour by 1.60934. For example, 10 miles per hour is 16.0934 kilometers per hour and 100 miles per hour is 160.934 kilometers per hour. The table below lists the most requested values, and the converter above accepts decimals for anything in between.
mph to km/h formula
km/h = mph × 1.60934
1 mile per hour is about 1.60934 kilometers per hour. Multiply the value in miles per hour by that factor to get kilometers per hour.
Miles per hour to Kilometers per hour conversion table
| miles per hour | kilometers per hour | Rounded |
|---|---|---|
| 1 mph | 1.60934 km/h | 1.61 |
| 2 mph | 3.21869 km/h | 3.22 |
| 3 mph | 4.82803 km/h | 4.83 |
| 4 mph | 6.43738 km/h | 6.44 |
| 5 mph | 8.04672 km/h | 8.05 |
| 6 mph | 9.65606 km/h | 9.66 |
| 7 mph | 11.2654 km/h | 11.3 |
| 8 mph | 12.8748 km/h | 12.9 |
| 9 mph | 14.4841 km/h | 14.5 |
| 10 mph | 16.0934 km/h | 16.1 |
| 12 mph | 19.3121 km/h | 19.3 |
| 15 mph | 24.1402 km/h | 24.1 |
| 20 mph | 32.1869 km/h | 32.2 |
| 25 mph | 40.2336 km/h | 40.2 |
| 30 mph | 48.2803 km/h | 48.3 |
| 40 mph | 64.3738 km/h | 64.4 |
| 50 mph | 80.4672 km/h | 80.5 |
| 60 mph | 96.5606 km/h | 96.6 |
| 70 mph | 112.654 km/h | 113 |
| 75 mph | 120.701 km/h | 121 |
| 80 mph | 128.748 km/h | 129 |
| 90 mph | 144.841 km/h | 145 |
| 100 mph | 160.934 km/h | 161 |
| 150 mph | 241.402 km/h | 241 |
| 200 mph | 321.869 km/h | 322 |
| 250 mph | 402.336 km/h | 402 |
| 300 mph | 482.803 km/h | 483 |
| 500 mph | 804.672 km/h | 805 |
| 750 mph | 1,207.01 km/h | 1,207 |
| 1,000 mph | 1,609.34 km/h | 1,609 |
Frequently asked questions
How many kilometers per hour are in 5 miles per hour?
5 mph = 8.04672 km/h. Multiply 5 by 1.60934, the number of kilometers per hour in one mile per hour. The converter on this page does the same arithmetic for any value, including decimals.
What is the formula to convert miles per hour to kilometers per hour?
km/h = mph × 1.60934. The factor comes from the definitions of the units: 1 mile per hour is about 1.60934 kilometers per hour. Worked example: 12 mph = 19.3121 km/h.
Is 30 mph the same as 48.2803 km/h?
Yes. 30 mph = 48.2803 km/h. Rounded to four decimals it is 48.28 km/h.
How do I convert kilometers per hour back to miles per hour?
Divide by 1.60934, or multiply by 0.621371: 1 kilometer per hour is 0.621371 miles per hour. The kilometers per hour to miles per hour page linked above lists common values the other way.
Is the mph to km/h conversion exact?
1 mile per hour is about 1.60934 kilometers per hour. The ratio is a defined constant but produces a long decimal, so this page rounds to six significant digits, which is more precision than any everyday measurement needs.