Convert KM to MILES, Free
Type any KM value and see the MILES result instantly. No button press needed.
How to convert KM to MILES
One kilometer equals exactly 0.621371192 miles, derived from the international yard and pound agreement of 1959. To convert km to miles, multiply by 0.621371 (commonly approximated as 0.6214 or the rougher estimate of 0.625 for quick mental math). The calculation runs instantly in your browser. Going the other direction, one mile is approximately 1.60934 km.
This conversion matters most for international drivers, runners, and cyclists who encounter mixed units. European speed limits are in km/h; US and UK road signs show miles and mph. A 5K race is 3.107 miles. A marathon is 42.195 km or 26.219 miles. Speed limits of 100 km/h equal 62.1 mph. For travel and navigation these equivalents are worth memorizing, but for precise calculations the exact factor is always best.
Enter the distance in kilometers
Type any km value, including decimals. Works for anything from 0.1 km to intercontinental distances.
Get the miles result instantly
The conversion (km x 0.621371) appears as you type.
Switch to miles-to-km
Enter a value in the miles field to convert in the other direction (miles x 1.60934).
View the quick reference table
Common distances (5K, 10K, half marathon, marathon) are shown with both km and miles values for quick reference.
Frequently asked questions
How many miles is 1 kilometer?
Exactly 0.621371192 miles. For everyday use, 0.6214 is a good rounded value.
What is 100 km in miles?
100 x 0.621371 = 62.14 miles. Speed limits of 100 km/h are roughly 62 mph.
What is the quick mental approximation?
Multiply by 0.625 (or divide by 1.6) for a rough estimate: 100 km x 0.625 = 62.5 miles, off by about 0.6%.
How long is a 5K in miles?
5 x 0.621371 = 3.107 miles.
Which countries use miles for road distances?
The United States, the United Kingdom, and Liberia use miles. Most other countries use kilometers. Myanmar was the last major country to switch away from miles, completing the change in the 2010s.