Seldons
km to miles
1 kilometer = 0.621371 miles.
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How do you convert kilometers to miles?
Use this formula. It is exact — these units are defined by international agreement, not measured.
mi = km ÷ 1.609344
Example: 10 km × 0.621371192 = 6.21371 mi.
km to miles conversion table
Common values, rounded to six significant figures.
| km | mi |
|---|---|
| 1 km | 0.621371 mi |
| 2 km | 1.24274 mi |
| 3 km | 1.86411 mi |
| 5 km | 3.10686 mi |
| 10 km | 6.21371 mi |
| 15 km | 9.32057 mi |
| 20 km | 12.4274 mi |
| 25 km | 15.5343 mi |
| 30 km | 18.6411 mi |
| 42.195 km | 26.2188 mi |
| 50 km | 31.0686 mi |
| 80 km | 49.7097 mi |
| 100 km | 62.1371 mi |
| 150 km | 93.2057 mi |
| 200 km | 124.274 mi |
| 500 km | 310.686 mi |
Road signs, race distances and car odometers switch between these two depending on the country. Runners hit it constantly: a 5K is 3.11 miles, a half marathon 13.1, and a full marathon 26.2 — the 42.195 km figure comes from the 1908 London Olympic course, not from a round number.
Values worth remembering
These come up often enough that knowing them saves a lookup.
- 42.195 km = 26.2188 mia marathon
- 5 km = 3.10686 mia 5K race
- 100 km = 62.1371 mian hour on the highway
Questions people ask
How many miles is 1 kilometer?
1 kilometer is 0.621371 miles.
How many kilometers is 1 mile?
1 mile is 1.60934 kilometers.
How do you convert kilometers to miles in your head?
Use × 0.6. That lands within a percent or so of the exact figure, which is close enough for packing, shipping estimates and shopping — use the calculator when the number has to be right.
Is the kilometer to mile conversion exact?
Yes. The relationship is exact by international agreement, so 0.621371192 is a definition rather than a measurement. Rounding in the answer comes from display, not from the conversion.