Km to miles
One km equals 0.6213711922 mi. Type any number and the answer appears as you type — the maths happens in your browser.
Result
The same value in every unit
| Unit | Value |
|---|
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Common values
| km | miles |
|---|---|
| 1 km | 0.62137119 mi |
| 2 km | 1.2427424 mi |
| 3 km | 1.8641136 mi |
| 5 km | 3.106856 mi |
| 10 km | 6.2137119 mi |
| 15 km | 9.3205679 mi |
| 20 km | 12.427424 mi |
| 25 km | 15.53428 mi |
| 50 km | 31.06856 mi |
| 100 km | 62.137119 mi |
| 500 km | 310.6856 mi |
| 1000 km | 621.37119 mi |
How to use
- Enter the number of km in the field.
- The result in miles updates on every keystroke.
- Use the table below for the values people look up most often.
Formula and reverse conversion
The formula
To convert by hand: mi = km ÷ 1.609344. Going back the other way, one mi is 1.609344 km.
Where the odd number comes from
The factor is not a round number because the imperial units are defined through the metric ones by international agreement: an inch is exactly 25.4 mm and a pound is exactly 0.45359237 kg. Everything else follows from those definitions.
mi = km ÷ 1.609344
Frequently asked questions
How many miles are in one km?
One km is 0.6213711922 mi.
How do I convert km to miles?
Multiply by the factor: mi = km ÷ 1.609344.
Is the result exact?
The factors are the exact legal definitions, and up to ten significant digits are kept in the answer. Rounding happens only in the display.
How do I convert miles back to km?
One mi is 1.609344 km — or open the reverse page linked below.