Race names may be rounded
A marathon is officially 42.195 km, so the familiar 26.2-mile label is not the exact defining distance.
Unit converter
Miles to KM Converter
Convert miles to kilometres instantly. Miles to kilometres for roads and races. See the formula, worked examples and practical reference values.
How to convert mi to km
Miles to kilometres is useful for road distances, running events and travel planning between countries using different distance units.
Formula: km = mi × 1.609344
Reverse formula: mi = km × 0.621371
Worked example
1 mi = 1.609344 km
- = 1,609.344 m
- = 5,280 ft
- = 63,360 in
Avoid these errors
Common mistakes
Miles and nautical miles are different
This page uses statute miles; one nautical mile is exactly 1.852 kilometres.
Useful for: Road, race and travel distances in kilometres.
Common mi to km conversions
| miles | kilometres |
|---|---|
| 1 mi | 1.609344 km |
| 3 mi | 4.828032 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.09344 km |
| 13.1 mi | 21.082406 km |
| 26.2 mi | 42.164813 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.9344 km |
About the units
A mile is an imperial unit represented by mi. A kilometre is a metric unit represented by km. Calculations use the same authoritative registry as the full length converter, retaining full precision until display.
Sources and definitions
NIST — SI units and conversion guidance
Conversion constants come from the shared EzyCalculator unit registry. See how calculations are reviewed and tested.