Square miles to square kilometers
Type a value in square miles to see it in square kilometers straight away, or type in the second box to convert back.
Loading the tool…
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 square miles box.
- Read the result in square kilometers as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
km² = mi² × 2.58998811
Multiply the value in square miles by 2.58998811 to get square kilometers.
Example
To convert 25 mi² to square kilometers: 25 × 2.58998811 = 64.7497 km².
Conversion table
| Square miles (mi²) | Square kilometers (km²) |
|---|---|
| 1 | 2.58999 |
| 2 | 5.17998 |
| 3 | 7.76996 |
| 5 | 12.9499 |
| 10 | 25.8999 |
| 20 | 51.7998 |
| 25 | 64.7497 |
| 50 | 129.499 |
| 100 | 258.999 |
| 250 | 647.497 |
| 500 | 1,294.99 |
| 1,000 | 2,589.99 |
About the units
- Square mile
- A square mile is 640 acres, exactly 2,589,988.110336 square meters.
- Square kilometer
- A square kilometer is exactly 1,000,000 square meters, used for the area of cities and countries.
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 square kilometers are in one square mile?
1 mi² = 2.58999 km² exactly.
How do I convert square miles to square kilometers?
Use km² = mi² × 2.58998811. For example, 25 mi² = 64.7497 km².
How many square miles are in one square kilometer?
1 km² = 0.386102 mi².
How do I convert square meters to square feet?
Divide the square meters by 0.09290304, or multiply by about 10.7639. The factor is exact because a foot is exactly 0.3048 m.
Are the dunam, feddan and acre the same size?
No. A metric dunam is 1000 m², an Iraqi dunam 2500 m², an Egyptian feddan about 4200.83 m² and an acre 4046.8564224 m².