# Miles to kilometers Enter a distance in miles to see it in kilometers. One mile equals exactly 1.609344 kilometers. To convert miles to kilometers, multiply the number of miles by 1.609344. ## How the conversion works ``` kilometers = miles × 1.609344 ``` This one is exact rather than rounded. In 1959 the United States, United Kingdom and four other countries agreed to define the yard as exactly 0.9144 metres, which fixes the mile at exactly 1,609.344 metres. No approximation is involved. ### A worked example A 60 mph speed limit: 60 × 1.609344 = 96.56 km/h, which is why countries converting from imperial road signs often ended up with a 100 km/h limit as the nearest round equivalent. ## Reference table Common mile to kilometer conversions. | Miles | Kilometers | |---|---| | 1 mi | 1.60934 | | 2 mi | 3.21869 | | 3 mi | 4.82803 | | 5 mi | 8.04672 | | 10 mi | 16.09344 | | 15 mi | 24.14016 | | 20 mi | 32.18688 | | 25 mi | 40.2336 | | 30 mi | 48.28032 | | 50 mi | 80.4672 | | 75 mi | 120.7008 | | 100 mi | 160.9344 | | 150 mi | 241.4016 | | 200 mi | 321.8688 | | 500 mi | 804.672 | | 1000 mi | 1,609.344 | ## Doing it in your head Add half the number, then a tenth: 40 miles becomes 40 + 20 + 4 = 64 km, against a true 64.4. The error stays under 1% at any size. Going the other way? Use the kilometers to miles converter . ## Next steps - [convert kilometers to miles](https://www.kilometer-mileage.com/km-to-miles.html) - [convert mph speed limits to km/h](https://www.kilometer-mileage.com/kmh-to-mph.html) - [the exact definitions behind these figures](https://www.kilometer-mileage.com/about.html) ## Common questions