How to convert square miles to hectares
To convert square miles to hectares, multiply by 258.998811034. Area conversions are essential for real estate, flooring, land surveys, farming and map reading.
Square Mile to Hectare conversion table
| Square Mile (mi²) | Hectare (ha) |
|---|---|
| 0.1 mi² | 25.8998811034 ha |
| 0.5 mi² | 129.499405517 ha |
| 1 mi² | 258.998811034 ha |
| 2 mi² | 517.997622067 ha |
| 3 mi² | 776.996433101 ha |
| 4 mi² | 1,035.99524413 ha |
| 5 mi² | 1,294.99405517 ha |
| 10 mi² | 2,589.98811034 ha |
| 20 mi² | 5,179.97622067 ha |
| 25 mi² | 6,474.97027584 ha |
| 50 mi² | 12,949.9405517 ha |
| 100 mi² | 25,899.8811034 ha |
| 500 mi² | 129,499.405517 ha |
| 1,000 mi² | 258,998.811034 ha |
About the units
Square Mile (mi²)
A square mile equals 640 acres, or about 2.59 square kilometers.
Hectare (ha)
A hectare equals 10,000 m² (a 100 m × 100 m square) and is the metric unit for farmland.
How to use this converter
- Type the number of square miles (mi²) in the input box.
- The result in hectares appears instantly — no button needed.
- See the same value in every other area unit just below.
- Use “Swap units” to convert hectares back to square miles.
Tips for better results
- Double-check which system a unit belongs to (for example US vs UK gallons).
- Use the swap button to convert in the opposite direction instantly.
- Bookmark the conversions you use most — each pair has its own page.
Frequently asked questions
How many hectares are in one square mile?
One square mile equals 258.998811034 hectares. 258.998811034 is the exact factor used by this converter.
How do I convert square miles to hectares?
Multiply the value in square miles by 258.998811034. To go the other way, multiply hectares by 0.00386102158542.
What is 10 mi² in ha?
10 mi² = 2,589.98811034 ha. Also, 5 mi² = 1,294.99405517 ha and 100 mi² = 25,899.8811034 ha.
What is the difference between a square mile and a hectare?
A square mile equals 640 acres, or about 2.59 square kilometers. A hectare equals 10,000 m² (a 100 m × 100 m square) and is the metric unit for farmland.
Is this tool free and private?
Yes — the Square Mile to Hectare is completely free with no sign-up, and it runs entirely in your browser, so the values you enter are never uploaded to our servers.
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