Miles to km Converter

Multiply miles by 1.609344 to get kilometres. Useful for travel plans, running and cycling distances, and comparing U.S. or UK road distances with metric maps.

How to use the Miles to km Converter

1. Type the number of miles into the Miles field. Decimals such as 5 are fine.
2. Read the answer in Kilometres – it updates as you type, with no button to press.
3. To convert the other way, type into Kilometres and the miles are recalculated.
4. Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.

This page converts only mi ⇄ km. Need a different unit? Use the general length converter, where you can choose any “from” and “to” unit.

How it works

Both units measure length, so they are always in the same ratio: one mile equals 1.609344 kilometres. The calculator multiplies the number of miles you type by 1.609344 to give kilometres, and when you type into the kilometres field it divides by the same factor to give miles. Because the ratio never changes, doubling the miles always doubles the kilometres. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).

How to convert miles to kilometres

1. Write down the value in miles, for example 10 mi.
2. Multiply by the conversion factor 1.609344 (because 1 mile = 1.609344 km).
3. 10 × 1.609344 = 16.09344 km.
4. To go back from kilometres to miles, divide by 1.609344 – or multiply by 0.62137119.

mi to km conversion table

What is a mile?

The statute mile is 5,280 feet, exactly 1,609.344 m. U.S. and UK road signs, speed limits and running races such as the mile and the marathon (26.2 mi) use it.

What is a kilometre?

A kilometre is 1,000 metres. It is the standard unit for road distances, maps, running races and travel in almost every country except the U.S. and UK, where miles are still used on road signs.

Quick mental conversion

For a fast estimate, multiply miles by about 1.6 to get kilometres; the error is about 0.6%. Use the calculator above when you need the exact figure.

Common mistakes to avoid

Mixing the international foot (0.3048 m) with the old u.s. survey foot, confusing nautical and statute miles, and writing decimal feet such as 5.5 ft as “5 ft 5 in” (it is 5 ft 6 in).