Miles to Kilometers Converter
Convert miles to kilometers — 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 to Kilometers 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 miles to kilometers formula
One mile equals 1.609344 kilometers, so multiply miles by 1.609344: km = mi × 1.609344. For example, a 26.2-mile marathon is 26.2 × 1.609344 = 42.16 km. To estimate in your head, add roughly 60% to the mileage.
Running and driving distances
A 5K race is 3.11 miles and a 10K is 6.21 miles. 5 mi is 8.05 km, 10 mi is 16.09 km, and a 60 mph speed limit is about 96.6 km/h. The factor is the same whether you measure a run, a drive or a flight.
Frequently asked questions
How do I convert miles to kilometers?
Type the number of miles in the first box and read the result in kilometers — it updates as you type. To go the other way, type in the kilometers 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.