Miles to KM●
Miles in. Kilometres out. Convert distances in a moment.
Length
Use a decimal point (2.54), scientific notation (1e3), or feet + inches (5 ft 11 in).
Feet + inches detected. The source unit is set to feet. Swap converts the value to the other unit.
Fractional results are rounded to the nearest 1/16 inch.
Try a value
Pick an example to startThe formula
kilometres = miles × 1.609344
One international mile is exactly 1.609344 kilometres. Multiply the number of miles by 1.609344 to get kilometres.
A worked example
For 10 miles, multiply 10 by 1.609344. The result is exactly 16.09344 kilometres.
10 × 1.609344 = 16.09344 km
Quick reference
Reference values are rounded to 6 decimal places. Use the converter above for other values or precision.
| Miles (mi) | Kilometres (km) |
|---|---|
| 1 | 1.609344 |
| 2 | 3.218688 |
| 5 | 8.04672 |
| 10 | 16.09344 |
| 13.1 | 21.082406 |
| 20 | 32.18688 |
| 26.2 | 42.164813 |
| 50 | 80.4672 |
| 100 | 160.9344 |
All equivalent units
The same value, in every supported unit.
Length conversions
For road signs, runs and trips.
Use this conversion for road distances, running and cycling routes, speed limits and travel plans. A quick estimate is to multiply miles by 1.6, so 10 miles is about 16 kilometres.
Calculation details & precision
Length conversions use metres as the base unit. The international inch is exactly 0.0254 m; a foot is 12 inches, an international mile is 1,609.344 m, and an international nautical mile is 1,852 m.
Automatic displays up to 12 significant digits. Choose 2, 4 or 6 decimal places in Precision for a shorter result. Displayed results are rounded; very large or small values use scientific notation.
Common questions
Do I multiply or divide by 1.609344?
Multiply miles by 1.609344 to get kilometres. In the other direction, divide kilometres by 1.609344 to get miles.
How many kilometres are in a marathon?
A marathon is 26.2 miles, which is approximately 42.16 kilometres. The official distance is 42.195 km.