Kilometers per Hour to Miles per Hour converter (km/h to mph)
Convert Kilometers per Hour (km/h) to Miles per Hour (mph) with this free calculator. Type a value, press Convert, and the page applies the same factor shown in the formula below — no rounded shortcut, and nothing is stored on a server.
Miles per Hour to Kilometers per Hour (mph to km/h) ►
How to convert Kilometers per Hour to Miles per Hour
1 kilometer per hour (km/h) is equal to 0.621371 miles per hour (mph).
mph = kmh × 0.621371
Multiply the speed in km/h by 0.621371:
Example: Convert 100 km/h to mph:
mph = 100 × 0.621371 = 62.1371 mph
What is a Kilometers per Hour?
The Kilometers per Hour (km/h) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
What is a Miles per Hour?
The Miles per Hour (mph) is the starting or target unit on this page. Use the calculator above to convert values without looking up the factor by hand.
This page converts speed from Kilometers per Hour into Miles per Hour. One km/h equals 0.621371 mph.
Kilometers per Hour to Miles per Hour conversion table
Common km/h values and the matching mph result, calculated with the same factor as the widget. Highlight a nearby row if you want a quick check without entering a number.
| Kilometers per Hour (km/h) | Miles per Hour (mph) |
|---|---|
| 10 km/h | 6.21371 mph |
| 20 km/h | 12.42742 mph |
| 30 km/h | 18.64113 mph |
| 50 km/h | 31.06855 mph |
| 60 km/h | 37.28226 mph |
| 80 km/h | 49.70968 mph |
| 100 km/h | 62.1371 mph |
| 120 km/h | 74.56452 mph |
| 150 km/h | 93.20565 mph |
| 200 km/h | 124.2742 mph |
How this calculator works
The form on this page is a Kilometers per Hour-to-Miles per Hour converter. After you enter a number, JavaScript multiplies or rearranges it with the published conversion factor and writes the mph result in the output box. The step-by-step panel repeats the arithmetic so you can copy it into homework or a spreadsheet.
Reviewed by Hamsen, founder of GigaTables and a biology engineer. See the about page for how formulas are checked before a tool is published.
FAQ
How many mph are in 1 km/h?
1 km/h = 0.621371 mph.
How do I convert Kilometers per Hour to Miles per Hour?
Multiply the speed in km/h by 0.621371:
Is this km/h to mph converter free?
Yes. GigaTables calculators are free to use in a browser. You do not need an account, and the values you type are not uploaded.