Kilometers to Miles
( km → mi )
Instantly convert kilometers to miles. Enter any value below and get an accurate result with the full formula and reference table.
How to Convert Kilometers to Miles
To convert kilometers to miles, multiply the number of kilometers by 0.621371. This factor comes from the fact that one mile is exactly 1.609344 kilometers, so 1 km = 1/1.609344 ≈ 0.621371 miles.
Step-by-Step Example
Let’s convert 5 kilometers (a common running distance) to miles:
1. Multiply by 0.621371: 5 × 0.621371 = 3.106855 miles
2. So 5 km is approximately 3.11 miles.
For a marathon distance (42.195 km): 42.195 × 0.621371 ≈ 26.2187 miles (the official marathon distance is 26.219 miles).
Why 0.621371?
The exact conversion is 1 km = 1/1.609344 mi = 0.621371192237334 mi. The value 0.621371 is a convenient rounded figure for everyday use, but the converter uses the precise factor to ensure accuracy.
When You’d Use Each Unit
Kilometers are the standard unit of distance in most countries for road signs, maps, and running races. Miles are primarily used in the United States and the United Kingdom for road distances and speed limits. Converting between them is essential for travel, understanding race distances, and international communication.
Common kilometers values converted to miles — popular race distances highlighted.
| Kilometers (km) | Miles (mi) | Approximate |
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