# km to Miles Converter URL: https://speedycalculator.com/calculators/conversion/km-to-miles/ Last updated: 2026-10-25 > Convert kilometres (km) to miles (mi): 1 kilometre = 0.62137119 mi, so multiply by 0.62137119 or divide by 1.609344. Both fields are editable, so you can also type in miles and get kilometres back. ## Inputs - Kilometres (km) ## Results - Miles ## Formula ``` 1 km = 0.62137119 mi 1 mi = 1.609344 km mi = km × 0.62137119 ``` ## Explanation Kilometres to miles is the conversion behind race distances, road signs and car odometers. A mile is exactly 1.609344 km, so a 5 km run is about 3.1 miles. ### How to use the km to Miles Converter - Type the number of kilometres into the **Kilometres** field. Decimals such as 2.5 are fine. - Read the answer in **Miles** – it updates as you type, with no button to press. - To convert the other way, type into **Miles** and the kilometres 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 km ⇄ mi. 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 kilometre equals 0.62137119 miles. The calculator multiplies the number of kilometres you type by 0.62137119 to give miles, and when you type into the miles field it divides by the same factor to give kilometres. Because the ratio never changes, doubling the kilometres always doubles the miles. 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 kilometres to miles - Write down the value in kilometres, for example **5 km**. - Multiply by the conversion factor 0.62137119 (because 1 kilometre = 0.62137119 mi). - 5 × 0.62137119 = **3.106856 mi**. - To go back from miles to kilometres, divide by 0.62137119 – or multiply by 1.609344. ### km to mi conversion table KilometresMilesMilesKilometres1 km0.62137119 mi1 mi1.609344 km3 km1.8641136 mi2 mi3.218688 km5 km3.106856 mi5 mi8.04672 km10 km6.2137119 mi10 mi16.09344 km20 km12.427424 mi20 mi32.18688 km21.0975 km13.109379 mi50 mi80.4672 km30 km18.641136 mi100 mi160.9344 km42.195 km26.218757 mi1,000 mi1,609.344 km80 km49.709695 mi160 km99.419391 mi200 km124.27424 mi1,000 km621.37119 mi ### 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. ### 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. ### Quick mental conversion For a fast estimate, multiply kilometres by about **0.62** to get miles; the error is about 0.2%. 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 — Kilometres: 5 km. Results — **Miles = 3.10685596 mi**. ## FAQ **How many miles is a 5K?** About 3.11 miles. **How many miles is a marathon?** 42.195 km is 26.2 miles. **How many miles are in one kilometre?** 1 km = 0.62137119 mi. **How many kilometres are in one mile?** 1 mi = 1.609344 km. **How do I convert kilometres to miles?** Multiply the number of kilometres by 0.62137119. For example, 5 km × 0.62137119 = 3.106856 mi. **How do I convert miles back to kilometres?** Divide by 0.62137119 (or multiply by 1.609344), or simply type the value into the miles field above. **What is 10 km in miles?** 10 km = 6.2137119 mi. **What is 100 km in miles?** 100 km = 62.137119 mi. **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 kilometres and miles. To pick any length unit, use the general length converter linked under Related calculators. **What formula does the km to Miles Converter use?** 1 km = 0.62137119 mi. ## 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)