Kilometres ↔ miles converter
Instantly convert a distance between kilometres and miles in either direction.
Common race distances
| Distance | Kilometres | Miles |
|---|---|---|
| 5K | 5.00 km | 3.11 mi |
| 10K | 10.00 km | 6.21 mi |
| Half marathon | 21.10 km | 13.11 mi |
| Marathon | 42.20 km | 26.22 mi |
Frequently asked questions
How many miles are in a marathon?
A 42.195 km marathon is approximately 26.22 miles. The official distance of 26 miles and 385 yards was established at the 1908 London Olympic Games.
What is the exact conversion formula?
One kilometre equals 0.621371 miles, and one mile equals 1.60934 kilometres. These are the conversion factors used by this calculator.
Why do American races use miles?
The United States, the United Kingdom and a few other countries use the imperial system for everyday distances, including running events. Races of 1 mile and 5 miles are therefore common, while half-marathon distances are also often displayed in miles.
How do you convert kilometres into miles?
Kilometres and miles are distance units used respectively by the metric system — adopted by most countries — and the imperial system, notably in the United States and the United Kingdom. One mile equals 1.60934 kilometres, or approximately 1.6 km, which is a useful figure to remember for quick conversions.
This converter works in both directions: enter a value in kilometres to get its equivalent in miles, or vice versa. The table above also lists converted versions of the most common race distances, making it easy to compare a distance shown in miles on an app or sports watch with its equivalent in kilometres.