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km to miles
Convert kilometers to miles for US road and race distances.
1 kilometer equals 0.621371 miles. This free km to miles converter divides kilometers by 1.609344, the exact mile definition in kilometers. Use it for 5K and 10K race plans, foreign road signs, and product shipping ranges listed in km. The chart uses the same factor as the tool. No account is required.
How to convert km to miles
Divide kilometers by 1.609344. In short: miles = kilometers ÷ 1.609344.
Example: 10 km ÷ 1.609344 = 6.21371 mi. So 10 kilometers is 6.2137 miles.
Use the converter above for any value. Use the chart below when you need a common number fast.
km to miles conversion chart
Common kilometer values converted to miles, rounded to four decimal places.
| Kilometers (km) | Miles (mi) |
|---|---|
| 1 km | 0.6214 mi |
| 2 km | 1.2427 mi |
| 3 km | 1.8641 mi |
| 5 km | 3.1069 mi |
| 10 km | 6.2137 mi |
| 20 km | 12.4274 mi |
| 25 km | 15.5343 mi |
| 50 km | 31.0686 mi |
| 75 km | 46.6028 mi |
| 100 km | 62.1371 mi |
Scan the chart for quick checks. Use the converter above when your number is not listed.
Common km to miles conversions
1 km is 0.6214 miles. 5 km is 3.1069 miles.
10 km is 6.2137 miles. 21.0975 km (half marathon) is 13.1094 miles.
42.195 km (marathon) is 26.2188 miles. 100 km is 62.1371 miles.
Runners in the US often convert race distances printed only in kilometers on international event sites.
Why km to miles matters in the US
Americans still think of road and run distances in miles. Global race calendars and GPS apps often default to kilometers.
A clear km to miles conversion keeps training plans and trip estimates consistent. Using the exact mile factor avoids the rough 0.6 shortcut.
School work and science labs also switch units mid problem. Showing the formula keeps answers checkable.
More free converters
Need the reverse tool? Open miles to km. For the full set, visit the length converter hub. Related: miles to km and feet to meters.
See NIST - SI units for length for official SI length context.