# Miles to km Converter URL: https://speedycalculator.com/calculators/conversion/miles-to-km/ Last updated: 2026-10-25 > Convert miles (mi) to kilometres (km): 1 mile = 1.609344 km, so multiply by 1.609344 or divide by 0.62137119. Both fields are editable, so you can also type in kilometres and get miles back. ## Inputs - Miles (mi) ## Results - Kilometres ## Formula ``` 1 mi = 1.609344 km 1 km = 0.62137119 mi km = mi × 1.609344 ``` ## Explanation 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 - Type the number of miles into the **Miles** field. Decimals such as 5 are fine. - Read the answer in **Kilometres** – it updates as you type, with no button to press. - To convert the other way, type into **Kilometres** and the miles are recalculated. - 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 - Write down the value in miles, for example **10 mi**. - Multiply by the conversion factor 1.609344 (because 1 mile = 1.609344 km). - 10 × 1.609344 = **16.09344 km**. - To go back from kilometres to miles, divide by 1.609344 – or multiply by 0.62137119. ### mi to km conversion table MilesKilometresKilometresMiles0.5 mi0.804672 km1 km0.62137119 mi1 mi1.609344 km2 km1.2427424 mi2 mi3.218688 km5 km3.106856 mi5 mi8.04672 km10 km6.2137119 mi6.2 mi9.9779328 km20 km12.427424 mi10 mi16.09344 km50 km31.06856 mi13.1 mi21.082406 km100 km62.137119 mi20 mi32.18688 km1,000 km621.37119 mi26.2 mi42.164813 km60 mi96.56064 km100 mi160.9344 km500 mi804.672 km ### 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). ## Worked example Inputs — Miles: 10 mi. Results — **Kilometres = 16.09344 km**. ## FAQ **How many km is 10 miles?** 16.09 km. **What about nautical miles?** 1 nautical mile = 1.852 km, used at sea and in the air. **How do I convert miles to kilometres?** Multiply the number of miles by 1.609344. For example, 10 mi × 1.609344 = 16.09344 km. **How do I convert kilometres back to miles?** Divide by 1.609344 (or multiply by 0.62137119), or simply type the value into the kilometres field above. **What is 100 mi in kilometres?** 100 mi = 160.9344 km. **What is 5 mi in kilometres?** 5 mi = 8.04672 km. **Is this conversion exact?** Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit. **Can I convert to other units on this page?** This page converts only between miles and kilometres. To pick any length unit, use the general length converter linked under Related calculators. **What formula does the Miles to km Converter use?** 1 mi = 1.609344 km. ## Sources - [NIST Special Publication 811 – Guide for the Use of the International System of Units](https://www.nist.gov/pml/special-publication-811) - [NIST Handbook 44 Appendix C – General tables of units of measurement](https://www.nist.gov/pml/owm/nist-handbook-44-current-edition)