This kilometers per hour to miles per hour converter gives you the km/h to mph result instantly, in your browser, with the exact ratio so you can verify it. 1 kilometer per hour is about 0.621371 miles per hour, and going the other way, 1 mile per hour is 1.60934 kilometers per hour. Kilometers per hour are part of the metric system used in most countries; miles per hour are an imperial unit still common in the United States and the United Kingdom.
To convert by hand, multiply the number of kilometers per hour by 0.621371. For example, 10 kilometers per hour is 6.21371 miles per hour and 100 kilometers per hour is 62.1371 miles per hour. The table below lists the most requested values, and the converter above accepts decimals for anything in between.
km/h to mph formula
mph = km/h × 0.621371
1 kilometer per hour is about 0.621371 miles per hour. Multiply the value in kilometers per hour by that factor to get miles per hour.
Kilometers per hour to Miles per hour conversion table
| kilometers per hour | miles per hour | Rounded |
|---|---|---|
| 1 km/h | 0.621371 mph | 0.621 |
| 2 km/h | 1.24274 mph | 1.24 |
| 3 km/h | 1.86411 mph | 1.86 |
| 4 km/h | 2.48548 mph | 2.49 |
| 5 km/h | 3.10686 mph | 3.11 |
| 6 km/h | 3.72823 mph | 3.73 |
| 7 km/h | 4.3496 mph | 4.35 |
| 8 km/h | 4.97097 mph | 4.97 |
| 9 km/h | 5.59234 mph | 5.59 |
| 10 km/h | 6.21371 mph | 6.21 |
| 12 km/h | 7.45645 mph | 7.46 |
| 15 km/h | 9.32057 mph | 9.32 |
| 20 km/h | 12.4274 mph | 12.4 |
| 25 km/h | 15.5343 mph | 15.5 |
| 30 km/h | 18.6411 mph | 18.6 |
| 40 km/h | 24.8548 mph | 24.9 |
| 50 km/h | 31.0686 mph | 31.1 |
| 60 km/h | 37.2823 mph | 37.3 |
| 70 km/h | 43.496 mph | 43.5 |
| 75 km/h | 46.6028 mph | 46.6 |
| 80 km/h | 49.7097 mph | 49.7 |
| 90 km/h | 55.9234 mph | 55.9 |
| 100 km/h | 62.1371 mph | 62.1 |
| 150 km/h | 93.2057 mph | 93.2 |
| 200 km/h | 124.274 mph | 124 |
| 250 km/h | 155.343 mph | 155 |
| 300 km/h | 186.411 mph | 186 |
| 500 km/h | 310.686 mph | 311 |
| 750 km/h | 466.028 mph | 466 |
| 1,000 km/h | 621.371 mph | 621 |
Frequently asked questions
How many miles per hour are in 5 kilometers per hour?
5 km/h = 3.10686 mph. Multiply 5 by 0.621371, the number of miles per hour in one kilometer per hour. The converter on this page does the same arithmetic for any value, including decimals.
What is the formula to convert kilometers per hour to miles per hour?
mph = km/h × 0.621371. The factor comes from the definitions of the units: 1 kilometer per hour is about 0.621371 miles per hour. Worked example: 12 km/h = 7.45645 mph.
Is 30 km/h the same as 18.6411 mph?
Yes. 30 km/h = 18.6411 mph. Rounded to four decimals it is 18.64 mph.
How do I convert miles per hour back to kilometers per hour?
Divide by 0.621371, or multiply by 1.60934: 1 mile per hour is 1.60934 kilometers per hour. The miles per hour to kilometers per hour page linked above lists common values the other way.
Is the km/h to mph conversion exact?
1 kilometer per hour is about 0.621371 miles 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.