Miles per Hour to Kilometers per Hour Converter
Convert miles per hour to kilometers per hour — and back — in an instant. Type a value in either box and the answer updates live. It’s accurate, free and completely private: the conversion runs entirely on your device.
- 🔒 100% private — no uploads
- 🆓 Free, no watermark
- 📱 Works on any device
How to convert
- 1
Choose your units
The tool opens on the most common pairing. Change either unit from its dropdown, or hit the swap button to flip the direction.
- 2
Type a value
Enter a number in either box. The other side updates instantly as you type — convert either way without pressing a button.
- 3
Copy or compare
Copy the result to your clipboard, or scan the common-values table below for quick at-a-glance conversions.
Why use Miles per Hour to Kilometers per Hour Converter?
100% private
Every conversion is computed locally in your browser. Nothing you enter ever leaves your device.
Instant & two-way
Results update live as you type, in either direction — no “convert” button and no page reloads.
Accurate
Conversions use exact, standards-based factors, so you get the same answer a trusted reference would.
Works on any device
No install and no account — it runs in any modern browser on desktop, tablet or phone.
The mph to km/h formula
Multiply miles per hour by 1.609344 to get kilometers per hour: km/h = mph × 1.609344. For example, 60 mph × 1.609344 = 96.56 km/h. Speed uses the same factor as distance, since both miles and kilometers measure length.
Common speed limits converted
30 mph is 48 km/h, 50 mph is 80 km/h, 60 mph is 97 km/h and 70 mph is 113 km/h. That is why a “100” on a European motorway sign (in km/h) is about 62 mph, not 100 mph.
Frequently asked questions
How do I convert miles per hour to kilometers per hour?
Type the number of miles per hour in the first box and read the result in kilometers per hour — it updates as you type. To go the other way, type in the kilometers per hour box instead.
Does anything get uploaded to a server?
No. The conversion runs entirely in your browser with JavaScript — nothing you type is uploaded, stored or logged, and it keeps working offline once the page has loaded.
Is it free?
Yes — completely free, no account, no watermark and no limits.