Direct conversion
Convert kilometer per hour [km/h] to mile per hour [mph] instantly with formula, examples, chart, and FAQs.
Quick answer
Use the calculator below for any custom value, then check the formula, examples, chart, and reverse conversion links.
1 kilometer per hour [km/h] = 0.621371 mile per hour [mph]
1 kilometer per hour [km/h] = 0.621371 mile per hour [mph]
Example: 1 kilometer per hour [km/h] equals 0.621371 mile per hour [mph].
Speed conversions use meter per second as the reference unit. Road, aviation, nautical, and physics units are converted through stored factors.
Displayed results are rounded for readability. The calculator keeps enough precision for everyday use and switches to scientific notation for very large or very small values. Last reviewed: 2026-05-21.
Kilometers per hour measures how many kilometers are traveled in one hour.
HistoryThe unit follows the metric system and became the common road-speed unit in many countries.
Current useKilometers per hour is used for speed limits, vehicles, cycling, running, weather reports, and transportation planning.
Miles per hour measures how many miles are traveled in one hour.
HistoryThe unit combines the customary mile with the hour and became common with road, rail, and vehicle speed measurement.
Current useMiles per hour is used for road speeds, vehicle dashboards, wind speeds, sports, and travel planning in the United States and UK.
| kilometer per hour [km/h] | mile per hour [mph] |
|---|---|
| 1 | 0.621371 |
| 2 | 1.242742 |
| 5 | 3.106856 |
| 10 | 6.213712 |
| 20 | 12.427424 |
| 25 | 15.53428 |
| 50 | 31.06856 |
| 100 | 62.137119 |
| 1000 | 621.371192 |
Use this formula: 1 kilometer per hour [km/h] = 0.621371 mile per hour [mph] Enter your value in the calculator and the result updates instantly.
1 kilometer per hour [km/h] equals 0.621371 mile per hour [mph].
Yes. Use the swap button in the calculator or open the related reverse conversion link when it is listed on this page.