KM to Miles Converter
Convert km to miles instantly. Formula: miles = kilometers × 0.621371. Free, no ads walls, runs in your browser.
1 Kilometer (km)
0.6213711922
Mile (mi)
Mile (mi) = Kilometer (km) × 0.6213711922
1 Kilometer (km) equals
Millimeter (mm)
1,000,000
Centimeter (cm)
100,000
Meter (m)
1,000
Inch (in)
39,370.0787402
Foot (ft)
3,280.83989501
Yard (yd)
1,093.61329834
Mile (mi)
0.6213711922
Convert km to miles instantly with this free online converter — the units are already selected above, so just type your value and read the result. It's most often needed for running and cycling distances, road-trip planning, and comparing speed limits abroad.
The conversion uses the exact formula miles = kilometers × 0.621371. Quick reference: 1 km = 0.62 mi, 5 km = 3.11 mi, 10 km = 6.21 mi, 42.195 km (marathon) = 26.22 mi. All math runs locally in your browser with 12-digit precision — nothing is sent to a server, and there's no sign-up or paywall.
How to convert units online
- 1Pick a category tab at the top — Length, Weight, Temperature, Volume, Area, Speed, or Data.
- 2Enter the number you want to convert in the Value field.
- 3Choose your starting unit in the From dropdown and your target unit in the To dropdown — the result updates instantly as you type.
- 4Click the swap button between the dropdowns to reverse the conversion direction.
- 5Check the formula shown under the result, and use the quick-reference grid below to see your value’s equivalent in every other unit of the category.
Frequently asked questions
What is the formula to convert km to miles?
miles = kilometers × 0.621371. The converter above applies it instantly as you type and shows the formula used under the result.
What are some common km to miles conversions?
1 km = 0.62 mi, 5 km = 3.11 mi, 10 km = 6.21 mi, 42.195 km (marathon) = 26.22 mi
Can I convert miles back to km?
Yes — click the swap button between the two unit selectors to reverse the conversion direction instantly.
Is this converter accurate?
Yes. It uses exact international conversion factors and computes to 12 significant digits, entirely in your browser.
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