Square miles to hectares
Type a value in square miles to see it in hectares 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 miles box.
- Read the result in hectares as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
ha = mi² × 258.998811
Multiply the value in square miles by 258.998811 to get hectares.
Example
To convert 25 mi² to hectares: 25 × 258.998811 = 6,474.97 ha.
Conversion table
| Square miles (mi²) | Hectares (ha) |
|---|---|
| 1 | 258.999 |
| 2 | 517.998 |
| 3 | 776.996 |
| 5 | 1,294.99 |
| 10 | 2,589.99 |
| 20 | 5,179.98 |
| 25 | 6,474.97 |
| 50 | 12,949.9 |
| 100 | 25,899.9 |
| 250 | 64,749.7 |
| 500 | 129,499 |
| 1,000 | 258,999 |
About the units
- Square mile
- A square mile is 640 acres, exactly 2,589,988.110336 square meters.
- Hectare
- A hectare is exactly 10,000 square meters, a square 100 m on each side, used for farmland.
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 hectares are in one square mile?
1 mi² = 258.999 ha exactly.
How do I convert square miles to hectares?
Use ha = mi² × 258.998811. For example, 25 mi² = 6,474.97 ha.
How many square miles are in one hectare?
1 ha = 0.00386102 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.