The exact miles-to-kilometers formula
One international statute mile equals exactly 1.609344 kilometers. Multiply miles by 1.609344 to calculate kilometers.
The relationship follows from one mile equaling 5,280 international feet and one international foot equaling exactly 0.3048 meters.
Worked distance examples
A 5-mile distance is 8.04672 kilometers. A 10-mile run is 16.09344 kilometers, commonly rounded to 16.09 km.
For road travel, 60 miles equals 96.56064 kilometers. Appropriate rounding depends on whether the number is an estimate, road sign, or measured route.
A quick mental conversion
Multiplying by 1.6 gives a close estimate: 25 miles is about 40 kilometers. The exact result is 40.2336 km.
Useful reference points are 5 miles at about 8 km, 50 miles at about 80 km, and 100 miles at about 161 km.
Statute miles and nautical miles
A statute mile is used for land distance, while a nautical mile is used in marine and aviation navigation. One nautical mile is exactly 1.852 kilometers.
Check the source label whenever the word mile appears in navigation, weather, or technical data.