Kilometers to Miles Converter
Enter a distance in kilometers to see it in miles right away. Edit either box and the other updates live. The math runs in your browser.
How to convert kilometers to miles
- Type the distance in kilometers into the left box.
- Read the miles value in the right box as it updates live.
- Edit the miles box instead to convert back to kilometers.
Examples
Short run
5 km
3.107 mi
10K race
10 km
6.214 mi
Frequently asked questions
What is the formula to convert kilometers to miles?
Multiply the kilometer value by 0.621371. So miles = km times 0.621371. For example, 5 km becomes 5 times 0.621371, which is about 3.107 miles.
How far is a 5K, 10K, or marathon in miles?
A 5K is 5 km, or about 3.11 miles. A 10K is 10 km, or about 6.21 miles. A marathon is 42.195 km, which works out to roughly 26.22 miles.
How do I convert a speed limit from km/h to mph?
The same factor applies: multiply by 0.621371. A 100 km/h limit is about 62 mph, and 50 km/h is about 31 mph. Use it as a quick mental check while driving.
What are some common kilometers to miles conversions?
1 km is about 0.621 mi, 5 km is about 3.107 mi, 10 km is about 6.214 mi, and 100 km is about 62.137 mi.
Is this conversion exact?
One mile is defined as exactly 1.609344 km, so the factor is exact. Results are rounded for display, but the underlying calculation is precise.
Is my data sent anywhere?
No. The conversion runs entirely in your browser, so the distances you enter never leave your device.
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