Kilometers to Miles Converter (km to mi)

The international mile is exactly 1,609.344 meters (5,280 feet of 0.3048 m), so 1 kilometer is about 0.621371 miles. Road signs and speed limits in the US and UK use miles; most other countries, and nearly all running races, use kilometers.

The same factor converts speeds: kilometers per hour to miles per hour is exactly the same calculation as kilometers to miles.

How to use this tool

1. Type a value in the Kilometer box to see it in miles, or type in the Mile box to convert the other way.
2. Press ⇄ to swap the two units, or Load example for a typical value.
3. Check the charts below for common values; for other units, open the Length converter.

Formula

mi = km ÷ 1.609344

km = mi × 1.609344

Both factors come from exact definitions: 1 mile = 1.609344 kilometers and 1 kilometer = 0.621371192237 miles (shown to 12 significant digits).

Example

Two conversions worked with the same factors the converter uses:

42.195 km × 0.621371192237 ≈ 26.2188 mi

26.2 mi × 1.609344 ≈ 42.1648 km

Kilometer to Mile chart

Common values from kilometers to miles, rounded to four decimal places.

Mile to Kilometer chart

The reverse direction for values people often look up.

Race distances in miles

Official race distances are set in kilometers (the marathon is 42.195 km), so the mile figures are converted.

Quick mental estimate

Multiply the kilometers by 0.6: 100 km → 60 mi, about 3.4% short. Consecutive Fibonacci numbers are a closer trick: 5 miles is about 8 km, and 8 miles is about 13 km.

Use the converter or the charts when the exact figure matters.

The two units

Kilometer (km): The kilometre is 1,000 metres. One international mile is exactly 1.609344 km; to convert kilometres to miles, divide by 1.609344.

Mile (mi): The international (statute) mile is exactly 1609.344 metres, or 5280 feet. It is the unit for road distances and speed limits in the United States and the United Kingdom.