Miles to km
One mi equals 1.609344 km. 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
| miles | km |
|---|---|
| 1 mi | 1.609344 km |
| 2 mi | 3.218688 km |
| 3 mi | 4.828032 km |
| 5 mi | 8.04672 km |
| 10 mi | 16.09344 km |
| 15 mi | 24.14016 km |
| 20 mi | 32.18688 km |
| 25 mi | 40.2336 km |
| 50 mi | 80.4672 km |
| 100 mi | 160.9344 km |
| 500 mi | 804.672 km |
| 1000 mi | 1609.344 km |
How to use
- Enter the number of miles in the field.
- The result in km 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: km = mi × 1.609344. Going back the other way, one km is 0.6213711922 mi.
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.
km = mi × 1.609344
Frequently asked questions
How many km are in one miles?
One mi is 1.609344 km.
How do I convert miles to km?
Multiply by the factor: km = mi × 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 km back to miles?
One km is 0.6213711922 mi — or open the reverse page linked below.