Kilometres to miles (km to mi)
Convert kilometres to miles (÷ 1.609344), with race distances from 5K to the marathon.
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A statute mile is exactly 1.609344 km, so miles = kilometres ÷ 1.609344 (× 0.621371). A 5K run is 3.11 mi, a 10K 6.21 mi, a half marathon (21.0975 km) 13.11 mi and a marathon (42.195 km) 26.22 mi.
Runners, cyclists and drivers crossing between metric countries and the US or UK use this constantly. Speeds convert with the same factor, so 100 km/h is 62.14 mph. For nautical miles (1.852 km), use the length converter.
How to use it
- Type the value in the first box; the converted value appears in the second box as you type.
- Or type in the second box to convert the other way.
- Use the Decimals menu to round, and the quick-reference table for common values.
Frequently asked questions
How many miles is 1 km?
0.621371 mi. One mile is exactly 1.609344 km.
How many miles is a 5K?
3.107 mi. A 10K is 6.214 mi.
Is there a trick for km to miles?
Multiply by 0.6 and add a little: 80 km → 48 + 1.7 ≈ 49.7 mi (exact 49.71). Consecutive Fibonacci numbers also work: 8 km ≈ 5 mi, 13 km ≈ 8 mi, 21 km ≈ 13 mi.
Are UK miles different from US miles?
No. Both use the international mile of 1609.344 m. The only other mile in common use is the nautical mile (1852 m) at sea and in the air.
Related tools
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- Miles per hour to kilometres per hour (mph to km/h)Convert miles per hour to kilometres per hour (× 1.609344), with a table of common speed limits.
- Length and distance converterMillimetres, centimetres, metres, kilometres, inches, feet, yards, miles and nautical miles, converted both ways.
- Speed converterkm/h, mph, metres per second, knots and feet per second, converted both ways with exact factors.
- Fuel economy converter (mpg, L/100 km, km/L)Miles per gallon (US and UK), litres per 100 km and kilometres per litre, converted with the correct reciprocal formulas.