Kilometers to Miles Converter
Type a distance in kilometers to see it in miles instantly. The two boxes are linked, so editing either one updates the other, letting you convert miles back to kilometers just as easily. A reference table below shows common distances, and every calculation runs in your browser.
How to convert kilometers to miles
- Type the distance in kilometers into the left Kilometers box.
- Read the miles value in the right Miles box as it updates live while you type.
- Edit the right box instead to convert a mile figure back into kilometers.
- Check the reference table for 1, 2, 5, 10, 25, 50, and 100 km at a glance.
Examples
One kilometer
1 km
0.621371 mi
Short run
5 km
3.106856 mi
10K race distance
10 km
6.213712 mi
Frequently asked questions
What is the formula to convert kilometers to miles?
Multiply kilometers by 0.621371 to get miles. The tool actually divides by the exact 1.609344 km in a mile, so 5 km becomes 5000 / 1609.344, which is about 3.106856 miles.
Why does 5 km show 3.106856 rather than 3.107?
The converter displays up to six decimal places, so it shows 3.106856 instead of a shorter rounding like 3.11. The extra digits are handy when precision matters, and you can round the result yourself for casual use.
How far is a 5K, 10K, or marathon in miles?
A 5K equals 5 km, about 3.106856 miles. A 10K equals 10 km, about 6.213712 miles. A marathon is 42.195 km, which works out to roughly 26.22 miles.
How do I convert a km/h speed limit to mph?
The same factor applies to speed: multiply km/h by 0.621371. A 100 km/h limit is about 62.14 mph and a 50 km/h limit is about 31.07 mph. This tool converts distance, so use it as a mental cross-check while driving.
What are some common kilometers to miles values?
1 km is about 0.621371 mi, 2 km is about 1.242742 mi, 25 km is about 15.53428 mi, 50 km is about 31.06856 mi, and 100 km is about 62.137119 mi. The reference table lists these presets.
How do I go from miles back to kilometers?
Type into the right Miles box and the left box updates. One mile equals exactly 1.609344 km, so 10 miles becomes 16.09344 km. Multiplying miles by 1.609344 gives kilometers.
Is this conversion exact?
The factor is exact by definition, since one international mile is precisely 1.609344 kilometers. Only the on-screen display is rounded to six decimals; the underlying math uses the full-precision value.
Does this work for nautical miles?
No. This tool uses the statute or land mile of 1.609344 km. A nautical mile is longer, about 1.852 km, and is used for sea and air navigation, so it needs a different converter.
Is my data sent anywhere?
No. The conversion runs entirely in your browser with JavaScript, so the distances you enter never leave your device and nothing is uploaded or stored.
Learn more
- Kilometers and Miles Explained
Where the mile and kilometer come from, the exact 1.609344 factor, and quick mental tricks for converting between them.
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