How to convert miles to kilometers
To convert miles to kilometers, multiply each value by the exact factor in the box: 1 mile = 1.609344 kilometers exactly (5,280 feet × 0.3048 m). There is no rounding anywhere in the chain — the display trims the final answer to six decimal places, and converting the result back with the inverse page returns your starting number.
The statute mile — 5,280 feet, fixed in Elizabethan England so that a furlong would divide it neatly — is exactly 1.609344 km once the inch is defined as 25.4 mm: the precision is inherited, digit for digit. It remains the road unit of the United States and the UK, while the kilometer, a thousand meters, is the road unit everywhere else, which makes this the defining conversion of travel between the two systems.
Running and road trips fill the table for a reason. The 26.2 in the table is the marathon: 26 miles 385 yards, 42.195 km, usually quoted as 26.2 mi. A 5-mile run is 8.04672 km — noticeably more than the 8 km estimate that “multiply by 1.6” suggests when you are pacing it — and the 62.1 entry marks 100 km in reverse, the ultra-runner's landmark. Road distances (100 mi = 160.9344 km) and fuel-economy comparisons both start from the same multiplication.
The common mistake is the 1.6 shortcut compounding over distance: on a 500-mile drive it under-reads by nearly 5 km, and at marathon distance it misplaces the finish by almost 400 m. The second trap is the nautical mile, a different unit entirely (1.852 km, defined by Earth's geometry) used at sea and in the air — converting a nautical figure with 1.609344 understates it by 13%. This page is statute miles only, the kind on road signs and running watches on land.
Worked example
5 miles is 8.04672 kilometers: 5 × 1.609344 = 8.04672 — a standard weekday run, and a distance anyone training for a 10K should recognise as most of the way there.
How to use this converter
- Enter your value in miles in the box above — the result updates as you type.
- Read the converted value in kilometers in the headline panel.
- Check the factor, the formula and the inverse result (your answer converted back) in the stats if you need to show your working.
- Use the Miles to Kilometers conversion table below for other common values without typing each one.