KM to Miles converter

How to convert kilometers to miles

To convert kilometers to miles, use mi = km × 0.621371. For example, 50 km is 31.0686 mi. Type any value in the converter above and the result updates instantly.

The KM to Miles formula

The conversion is mi = km × 0.621371. One kilometer equals 0.621371 mi. This conversion is exact: kilometer is defined precisely in terms of mile, so the only rounding is in the digits shown.

KM to Miles conversion table

Where kilometers and miles are used

Kilometers measure road and running distances in almost every country outside the United States and the United Kingdom.

Miles measure road distances in the United States and the United Kingdom, and appear in running, cycling and aviation.

Worked examples

These examples use the formula above, so you can check the converter or do the same by hand:

• 2 km = 1.24274 mi
• 10 km = 6.21371 mi
• 42.2 km = 26.2219 mi

Converting kilometers to miles in your head

Multiply by 0.6: 100 km is about 60 miles (exactly 62.1 mi).

Miles to KM reference table

For the opposite direction, these values are handy to have at hand:

Common mistakes to avoid

• Do not confuse the international inch (exactly 25.4 mm) with the US survey foot used in old land records; everyday conversions use the international values.
• Feet and inches are often written together: 5 ft 9 in is 69 inches, or 175.26 cm.

About this converter

The converter accepts whole numbers, decimals and negative values, gives the result as you type, and uses full precision internally, so what you copy is as accurate as it can be. It runs in your browser: nothing you type is sent to a server, it keeps working offline once the page has loaded, and there is nothing to install.

Need the opposite direction? Use the Miles to KM converter.