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Converters
KM to Miles
One kilometre is 0.621371 miles. The international mile is exactly 1.609344 kilometres, so the converter divides a kilometre value by that length.
1 km = 0.6214 mi
How to use it
- Type a value in kilometres. The miles result updates immediately.
- Read the full factor under the result if you need to check the math by hand.
- Use the table for the values people look up most often.
- Open the reverse converter when you already have miles.
Formula
miles = kilometres × (1000 ÷ 1609.344)
The international mile is exactly 1.609344 kilometres, because it is 1,760 yards of 0.9144 metres. A marathon is 42.195 kilometres by design.
A marathon, in miles
42.195 kilometres ÷ 1.609344 = 26.219 miles. Race reports round that to 26.2 miles. The extra 0.019 mile is about 30 metres.
Runners, drivers, and map apps hit this conversion every day. Five kilometres is 3.107 miles, the usual “5K” park race. Ten kilometres is 6.214 miles. A marathon is 42.195 kilometres, which is 26.219 miles, the source of the familiar 26.2 figure. Speed converts with the same factor: 100 km/h is 62.137 mph.
Common km to miles values
| kilometres | miles |
|---|---|
| 1 km | 0.6214 mi |
| 5 km | 3.1069 mi |
| 10 km | 6.2137 mi |
| 21.0975 km | 13.1094 mi |
| 42.195 km | 26.2188 mi |
| 100 km | 62.1371 mi |
Questions
How do I convert kilometres to miles?
Use miles = kilometres × (1000 ÷ 1609.344). The converter applies that factor at full precision and rounds only what it displays.
Is this km to miles factor exact?
The international mile is exactly 1.609344 kilometres, because it is 1,760 yards of 0.9144 metres. A marathon is 42.195 kilometres by design.
How many miles is 5 km?
5 kilometres is 3.107 miles. Divide 5 by 1.609344.
Does ProHacks store the number I type?
No. The conversion runs in your browser. The value is not uploaded with the calculation.