Kilometers to Miles Converter
Convert kilometers to miles instantly for measuring, travel planning, fitness and navigation.
Last updated: May 2026
Enter a value to see the conversion instantly.
How to convert kilometers to miles
Enter a value in the kilometers field to instantly see the equivalent in miles. The formula is: miles = kilometers × 0.621371. The reverse: kilometers = miles × 1.609344.
Common reference values
| Kilometers | Miles | Typical use |
|---|---|---|
| 1 km | 0.6214 mi | Short walk distance |
| 5 km | 3.1069 mi | Popular running race |
| 10 km | 6.2137 mi | 10K race distance |
| 21.0975 km | 13.1094 mi | Half marathon |
| 42.195 km | 26.2188 mi | Full marathon |
| 50 km | 31.0686 mi | Long-distance cycling |
| 100 km | 62.1371 mi | One-day driving distance |
| 1000 km | 621.371 mi | Cross-country trip |
Understanding kilometers and miles
Kilometers are part of the metric system used in most countries for distance and speed limits. Miles are part of the imperial system, used primarily in the United States and the United Kingdom. The conversion factor is fixed: 1 mile equals exactly 1.609344 kilometers, which means 1 kilometer equals approximately 0.621371 miles.
When you'll need this conversion
Use this converter for: Reading US speed limits in metric units, comparing race distances across international standards, planning international trips, understanding fitness app data, converting GPS distances, comparing vehicle odometer readings when traveling between countries.
Frequently Asked Questions
How does the 5K, 10K and marathon distance translate to miles?
5K = 3.11 miles, 10K = 6.21 miles, half marathon = 13.11 miles, full marathon = 26.22 miles. These reference points help runners and spectators follow international race events. Most race apps give both km and mile splits, but the official distance is always in kilometers.
Is a mile longer than a kilometer?
Yes. One mile is about 1.6 kilometers, so a mile is approximately 60% longer than a kilometer.
My car's odometer shows miles — how many km have I driven?
Multiply your odometer reading by 1.609344. So if your trip shows 50 miles, you've driven 80.47 km. UK and US cars always display miles. If you're filling in a fleet form that requires km, multiply by 1.609344 and round to the nearest km.
How fast is 100 km/h in miles per hour?
100 km/h equals approximately 62.14 mph.
Can I convert running pace too?
Yes, but pace conversion is different. To convert pace (min/km to min/mile), multiply by 1.609.