A 10K race
Convert 10 km to about 6.21 miles, the distance of a standard 10K.
Use Kilometres to Miles
Converts kilometres to miles in this tab, with nothing sent anywhere.
Runs entirely on your deviceThe conversion happens in this browser tab. Nothing you type is uploaded, logged or stored, which is worth knowing for anything you would not paste into a search box.
A 10 km race is 6.2137 miles. That conversion describes route distance, not the number shown by every watch: GPS smoothing, corners, and where the runner crosses the road can make a recorded activity slightly longer.
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Find related browser-local tools for nearby tasks without starting another search.
Browse all general convertersAbout Kilometres to Miles
Kilometres measure road distances, runs and journeys across most of the world, while miles do the same in the US and UK. Converting kilometres to miles lets you read a metric distance the way an American or British audience pictures it - a race length, a road sign, a car's range. One kilometre is 0.6214 miles, so a 10 km run is about 6.2 miles, the classic figure runners know. Running and cycling apps set abroad log distance in kilometres, so a US athlete converting to miles can compare a session against the mile-based targets and races they train for. Car warranties and service intervals abroad are set in kilometres, so a US owner converts to miles to know when the odometer will actually reach them. Route distance and straight-line distance are different measurements even after both are converted to miles.
Using Kilometres to Miles
- Type a number of km. You can paste a value with its unit; the tool reads the number.
- The exact factor is applied and the result is shown as mi, updating live as you type.
- Copy the answer, or switch to the reverse converter to go from mi back to km.
Where kilometres to miles helps
Both directions
Need the opposite? The mi-to-km converter is linked below and uses the exact inverse factor.
Keep route distance separate from time
A 5 km route is about 3.1069 miles. Rounding that to 3.1 miles is often sufficient for a distance label, but estimating arrival time also requires speed, stops and route conditions. The converter uses the international mile; nautical miles belong to a separate navigation convention.
Before you use the result
- The result is rounded for readability, so a value converted and then converted back may differ in the last decimal place. The underlying factor is exact.
- Units in your input are ignored - only the number is read - so make sure the figure you type is really in km.
Questions about Kilometres to Miles
How many miles in a km?
About 0.6214 miles make one kilometre. Five kilometres is roughly 3.1 miles, which is why a 5K and a '3.1-mile run' are the same event.
Is my data uploaded?
No. Kilometres to Miles does the arithmetic in this browser tab; the value is calculated on your device and is not sent to a server.
Related tools
Miles to Kilometres
Convert miles to kilometres using the exact 1.609344 factor. Check running distances, road-trip examples, rounding and the difference from nautical miles.