1 km = 0.621371 mi
About distance units
Distance is length over a journey—roads, races, sea lanes and flight plans. Here you can move between meters, kilometers, miles and nautical miles.
In short
To convert kilometers to miles, multiply by 0.621371. One nautical mile equals exactly 1,852 meters (about 1.151 statute miles).
Road signs around the world
Most countries post highway distances and limits in kilometers. The United States (and still parts of the UK for road distance) uses miles. 100 km ≈ 62.1 miles; 60 miles ≈ 96.6 km. When a rental car or map switches systems, convert the whole route rather than guessing exit numbers.
Running & racing
A marathon is 42.195 km—about 26.22 miles. 5K and 10K races are metric by name; many US training plans still talk in miles. Switch units to compare a PR posted abroad with your local training log.
Nautical miles
One nautical mile equals exactly 1,852 m (about 1.151 statute miles). It matches one minute of latitude, which is why marine and aviation charts prefer it for courses and waypoints.
Maps & navigation apps
Phone maps often let you choose km or mi in settings, but imported GPX tracks or paper atlases may not. Convert a segment length once, then keep using that unit for the rest of the trip to avoid mixing pace and ETA.
Flight planning basics
Great-circle distances in airline ops are often in nautical miles, while passenger apps show km or mi. A 3,000 nmi sector is about 5,556 km. Use nautical miles when talking to aviation sources; convert for travelers reading metric guides.