Square kilometers to square miles
Type a value in square kilometers to see it in square miles 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 square kilometers box.
- Read the result in square miles as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
mi² = km² × 0.3861021585
Multiply the value in square kilometers by 0.3861021585 to get square miles.
Example
To convert 25 km² to square miles: 25 × 0.3861021585 = 9.65255 mi².
Conversion table
| Square kilometers (km²) | Square miles (mi²) |
|---|---|
| 1 | 0.386102 |
| 2 | 0.772204 |
| 3 | 1.15831 |
| 5 | 1.93051 |
| 10 | 3.86102 |
| 20 | 7.72204 |
| 25 | 9.65255 |
| 50 | 19.3051 |
| 100 | 38.6102 |
| 250 | 96.5255 |
| 500 | 193.051 |
| 1,000 | 386.102 |
About the units
- Square kilometer
- A square kilometer is exactly 1,000,000 square meters, used for the area of cities and countries.
- Square mile
- A square mile is 640 acres, exactly 2,589,988.110336 square meters.
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 miles are in one square kilometer?
1 km² = 0.386102 mi² exactly.
How do I convert square kilometers to square miles?
Use mi² = km² × 0.3861021585. For example, 25 km² = 9.65255 mi².
How many square kilometers are in one square mile?
1 mi² = 2.58999 km².
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.