Miles to Km
Free miles to kilometres converter — type any mile value and instantly see the result in km, metres, feet, and yards. No signup.
About Miles to Km
The Miles to Km Converter gives you an instant kilometre result the moment you start typing — no button press required. Enter any value in miles, including decimals, and the tool immediately shows the equivalent in kilometres as the primary result, with metres, feet, and yards as secondary conversions. A copy button grabs the km value straight to your clipboard.
The conversion is exact. One mile is defined as exactly 1.609344 kilometres under the 1959 International Yard and Pound Agreement, so the calculator simply multiplies your mile value by 1.609344. There is no rounding in the underlying math — just a clean multiplication. The reverse direction (one kilometre to miles) is approximately 0.621371, or exactly 1 ÷ 1.609344.
Most of the world runs on kilometres. The United States is the main holdout still using miles for road distance and speed limits, with the United Kingdom keeping miles on road signs while metricating most other measurements. So this conversion most often comes up when an American traveller plans a trip abroad, when an international visitor reads a US road sign, when comparing race distances across systems, or when reading any travel or sports data reported in the unit you do not natively think in. A marathon (26.2 miles) becomes 42.195 km. A 100-mile drive becomes 160.93 km. 60 mph becomes 96.56 km/h.
For quick mental conversion, two shortcuts work well. Multiply by 1.6 for an everyday approximation, or multiply by 8 and divide by 5 for an answer accurate to two decimal places on whole numbers. For exact figures, this tool uses the full 1.609344 factor and shows the result to six decimal places. Free, private, and runs entirely in your browser without an account or signup.
Frequently asked questions
Multiply your mile value by 1.609344 to get the equivalent in kilometres. So 1 mile is 1.609344 km, 5 miles is 8.04672 km, and 100 miles is 160.9344 km. This tool does the math instantly the moment you type.
One mile equals exactly 1.609344 kilometres. This is the internationally agreed definition — the international mile was defined by the 1959 International Yard and Pound Agreement as exactly 1,609.344 metres. Conversely, one kilometre is approximately 0.621371 miles.
The kilometre is part of the metric system, adopted by most of the world for everyday distance measurement. The mile is part of the imperial system and is still the standard in the United States, the United Kingdom (for road signs), and a few other places. Most science, medicine, and international trade run on metric.
A marathon is 26.2 miles, which works out to 42.16 km using the exact 1.609344 factor — though the official marathon distance is defined as 42.195 km (26.21875 miles). A half-marathon is 13.1 miles or 21.0975 km. A 10K is 6.214 miles, and a 5K is 3.107 miles.