Miles to Km Converter
Convert miles to kilometers or the reverse, using the exact factor. Handy for road distances, running events and speed limits when crossing between metric and imperial countries.
How to use this calculator
- Enter the distance in miles or km.
- Pick the direction of conversion.
- Press Convert to see miles, km, meters and nautical miles.
Formula used
The statute mile is exactly 1,609.344 meters (5,280 feet). A nautical mile — used at sea and in the air — is longer: exactly 1,852 meters.
Example calculation
Convert 10 miles: 10 × 1.609344 = 16.09 km. In reverse, a 10K race = 10 ÷ 1.609 = 6.21 miles, and a marathon (42.195 km) = 26.2 miles.
Miles, kilometers and running distances
Only a handful of countries still sign roads in miles — the US and UK chief among them — so this conversion comes up constantly for drivers, runners and travelers. The factor is exact: 1 mile = 1.609344 km.
Race anchors: 5K = 3.11 mi, 10K = 6.21 mi, half marathon = 13.1 mi = 21.1 km, marathon = 26.2 mi = 42.195 km. Pace math: a 5:00 min/km pace equals about 8:03 min/mile.
Why use this calculator?
- Translate road signs, distances and speed limits when driving abroad.
- Convert race distances and treadmill settings between conventions.
- Nautical miles included for sailing and flight tracking.
Frequently asked questions
How many km is a mile?
1.609344 km exactly. Estimate: add 60% — 50 miles ≈ 80 km. Reverse: km × 0.62 = miles.
How many miles is a 10K?
6.21 miles. A 5K is 3.11 miles, a half marathon 13.1 miles, a full marathon 26.2 miles (42.195 km).
What's the difference between a mile and a nautical mile?
A statute mile is 1,609 m; a nautical mile is 1,852 m — one minute of latitude. Ships and aircraft use nautical miles, and speeds in knots (nautical miles/hour).