In 1 kilometers there are 0.621371 miles. Meanwhile in 1 miles there are 1.609344 kilometers. Keep reading to learn more about each unit of measure and how they are calculated. Or just use the Miles to Kilometers calculator above to convert any number.
* Values rounded to 6 decimal places for readability
To convert kilometers to miles, use this simple formula:
The number 0.621371 is the kilometers-to-miles conversion factor. It tells you how many miles are in 1 kilometer.
Example:
For quick estimates, you can use 0.62:
Round your final result to the decimal places you need (often 2 decimals for everyday use).
1 kilometer equals 0.621371 miles.
To convert kilometers to miles, multiply kilometers by 0.621371.
Use this formula: miles = kilometers × 0.621371.
Example: 10 km × 0.621371 = 6.21371 miles.
Use this formula: kilometers = miles × 1.609344.
Example: 5 miles × 1.609344 = 8.04672 km.
The conversion factor from kilometers to miles is 0.621371.
It comes from the fixed relationship: 1 mile = 1.609344 km.
Yes, in rounded form.
1 km = 0.621371 miles, which rounds to 0.62 miles (2 decimals).
5 km = 5 × 0.621371 = 3.106855 miles.
Rounded: 3.11 miles.
10 km = 10 × 0.621371 = 6.21371 miles.
Rounded: 6.21 miles.
21.1 km = 21.1 × 0.621371 = 13.1107 miles.
Rounded: 13.11 miles (half marathon distance).
42.195 km = 42.195 × 0.621371 = 26.2188 miles.
Rounded: 26.22 miles (standard marathon distance).
A simple estimate is to multiply kilometers by 0.62.
This is close, but it’s less exact than using 0.621371.
The factor 0.621371 is based on exact definitions.
Any small mismatch comes from rounding your final number.
Kilometers come from the metric system.
Miles come from the imperial and US customary systems.
They use different base units, so the numbers won’t match.
Round based on your use.
For signs and driving, 1 or 2 decimals often works.
For races and stats, use 3 or more decimals when needed.
The Calculate Box tool to convert kilometers to miles uses the open source script Convert.js to convert units of measurement. To use this tool, simply type a kilometers value in the box and have it instantly converted to miles.