Unit Converter

KM to Miles Converter

Convert kilometers to miles for running, driving and travel. One kilometer is roughly 0.621371 miles — get the exact distance below.

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How to convert km to miles

  1. Enter the distance in kilometers into the box above.
  2. The mile equivalent updates live as you type.
  3. Switch either dropdown to convert between any length unit on this site.

The formula

Miles are found by multiplying kilometers by 0.621371:

miles = kilometers × 0.621371

Reversed, kilometers = miles × 1.609344.

Common km to miles values

KilometersMiles
1 km0.6214 mi
5 km3.1069 mi
10 km6.2137 mi
21.0975 km13.1094 mi
42.195 km26.2188 mi
100 km62.1371 mi

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Frequently asked questions

How do I convert kilometers to miles?
Multiply the kilometer value by 0.621371. For example, 10 km × 0.621371 ≈ 6.214 miles. The converter above shows the result live.
How many miles are in a kilometer?
One kilometer is about 0.621371 miles. The reverse factor — miles to km — is exactly 1.609344.
What is a 5K race in miles?
A 5 km race is about 3.107 miles (5 × 0.621371), which is why it’s often described as roughly "3.1 miles" by runners.
What is a marathon (42.195 km) in miles?
A marathon is 42.195 km, which converts to about 26.219 miles — the standard marathon distance runners quote as "26.2 miles".
Why isn’t the km-to-miles factor a round number?
The mile is defined as exactly 1609.344 meters, so its inverse (kilometers to miles) doesn’t simplify to a clean decimal — 0.621371 is itself a rounded value.
Does this tool track or upload the distances I enter?
No. Everything is computed locally in your browser with JavaScript — nothing is sent to a server.