Conversion result
21 km = 13.0488 mi
How the conversion works
Converting from kilometers to miles uses this relationship:
mi = km × 0.621371
Plugging in 21 km gives 13.0488 mi. Adjust the value in the calculator above if you need a different amount.
When people convert kilometers
This length conversion shows up in recipes, fitness tracking, travel, shopping, and school homework. Bookmark nearby values from the related list, or open the full unit converter for more unit pairs.