Miles to kilometers
Type a value in miles to see it in kilometers straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the miles box.
- Read the result in kilometers as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
km = mi × 1.609344
Multiply the value in miles by 1.609344 to get kilometers.
Example
To convert 25 mi to kilometers: 25 × 1.609344 = 40.2336 km.
Conversion table
| Miles (mi) | Kilometers (km) |
|---|---|
| 1 | 1.60934 |
| 2 | 3.21869 |
| 3 | 4.82803 |
| 5 | 8.04672 |
| 10 | 16.0934 |
| 20 | 32.1869 |
| 25 | 40.2336 |
| 50 | 80.4672 |
| 100 | 160.934 |
| 250 | 402.336 |
| 500 | 804.672 |
| 1,000 | 1,609.34 |
About the units
- Mile
- The international statute mile is 1760 yards, exactly 1609.344 meters, used on roads in the US and UK.
- Kilometer
- A kilometer is exactly 1000 meters and is the usual unit for road and travel distances.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many kilometers are in one mile?
1 mi = 1.60934 km exactly.
How do I convert miles to kilometers?
Use km = mi × 1.609344. For example, 25 mi = 40.2336 km.
How many miles are in one kilometer?
1 km = 0.621371 mi.
Are the inch, foot and mile factors exact or rounded?
They are exact by definition. Since the 1959 agreement one inch is exactly 2.54 cm, one foot 0.3048 m and one mile 1609.344 m.
What is the difference between a mile and a nautical mile?
A statute mile is 1609.344 meters and is used on roads. A nautical mile is 1852 meters and is used at sea and in aviation.