⚡ Speed
km/h to mph Converter
Convert km/h to mph instantly with a reference conversion table.
Quick answer: To convert km/h to mph, multiply by 0.621371. For example, 1 km/h = 0.621371 mph. Use the calculator below for any value.
km/h to mph
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Common conversions
| km/h | mph |
|---|
Formula:
How to convert km/h to mph
1
Enter your value
Type the number of km/h you want to convert into the left box. The result in mph appears instantly in the right box. You can also type into the right box to convert in the other direction.
2
Use the swap button
Click the ⇄ Swap button to reverse the conversion — mph to km/h. Your current value carries across so you don't have to re-enter anything.
3
About km/h and mph
km/h and mph are common speed measurements.
📊 Common conversions at a glance
| km/h | mph |
|---|---|
| 1 | 0.6214 |
| 5 | 3.107 |
| 10 | 6.214 |
| 20 | 12.43 |
| 30 | 18.64 |
| 50 | 31.07 |
Reviewed for 2026. km/h ↔ mph conversion factor verified against published reference data. Built by a UK-based qualified primary teacher and FA Level 2 coach as part of 247QuickTools' free utility-tools project.
Frequently asked questions
How do I convert km/h to mph?
To convert km/h to mph, multiply by 0.621371. Or use the calculator above for instant results.
How many mph are in 1 km/h?
1 km/h equals 0.621371 mph.
Is the km/h to mph converter free?
Yes, the km/h to mph converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.