⚡ Speed
mph to km/h Converter
Convert mph to km/h instantly with a reference conversion table.
Quick answer: To convert mph to km/h, multiply by 1.60934. For example, 1 mph = 1.60934 km/h. Use the calculator below for any value.
mph to km/h
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Common conversions
| mph | km/h |
|---|
Formula:
How to convert mph to km/h
1
Enter your value
Type the number of mph you want to convert into the left box. The result in km/h 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 — km/h to mph. Your current value carries across so you don't have to re-enter anything.
3
About mph and km/h
mph and km/h are common speed measurements.
📊 Common conversions at a glance
| mph | km/h |
|---|---|
| 1 | 1.609 |
| 5 | 8.047 |
| 10 | 16.09 |
| 20 | 32.19 |
| 25 | 40.23 |
| 30 | 48.28 |
Reviewed for 2026. mph ↔ km/h 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 mph to km/h?
To convert mph to km/h, multiply by 1.60934. Or use the calculator above for instant results.
How many km/h are in 1 mph?
1 mph equals 1.60934 km/h.
Is the mph to km/h converter free?
Yes, the mph to km/h converter is completely free with no sign-up required, no downloads, and it works offline once the page has loaded.