Convert kilometers to miles
Enter any value to calculate the result instantly.
kilometers to miles formula
Multiply kilometers by 0.6213711922. This follows from one international mile equaling exactly 1.609344 kilometers.
Conversion table
Use these reference values for a quick comparison. The calculator above accepts positive, negative, decimal, and large values when they are meaningful for the quantity.
| kilometers | miles |
|---|---|
| 1 km | 0.62137119 mi |
| 5 km | 3.10685596 mi |
| 10 km | 6.21371192 mi |
| 21.0975 km | 13.10937873 mi |
| 42.195 km | 26.21875745 mi |
| 100 km | 62.13711922 mi |
How to use this converter
Enter the source measurement in the first field. CalUnit applies the displayed formula and updates the destination value immediately. You can use decimals and negative values, copy the result into your work, and compare it with the reference table. Keep the original unit beside the starting measurement so another reader can verify the calculation. For a different unit pair, open the complete length conversion guide or the multi-unit length converter.
When this conversion is useful
Road signs and race distances use kilometers in most countries and miles in the United States and United Kingdom. The conversion is for statute miles, not nautical miles.
Accuracy and rounding
The underlying mile definition is exact. For travel estimates, two decimal places are usually enough; mapping and engineering work may need additional digits.
Standards references
CalUnit checks physical unit relationships against authoritative measurement references. See the NIST Guide to the SI conversion factors and the BIPM SI Brochure. Regional cooking measures and digital storage conventions are identified separately because their names can represent more than one definition.