Convert Square miles to hectares
1 square mile = 259 hectares · ha = mi² × 258.998811
When you need this conversion
This conversion goes from square miles, used for US counties, states, and large regions, to hectares, the metric land measure used in agriculture worldwide. Both measure the same physical quantity, so the conversion is exact — the difference is which unit your source, tool, or region happens to use.
Square miles to hectares conversion table
| Square miles (mi²) | Hectares (ha) |
|---|---|
| 1 mi² | 259 ha |
| 2 mi² | 518 ha |
| 3 mi² | 777 ha |
| 5 mi² | 1,294.99 ha |
| 10 mi² | 2,589.99 ha |
| 15 mi² | 3,884.98 ha |
| 20 mi² | 5,179.98 ha |
| 25 mi² | 6,474.97 ha |
| 50 mi² | 12,949.94 ha |
| 75 mi² | 19,424.91 ha |
| 100 mi² | 25,899.88 ha |
| 250 mi² | 64,749.7 ha |
| 500 mi² | 129,499.41 ha |
| 1,000 mi² | 258,998.81 ha |
The formula
ha = mi² × 258.998811Because both units measure area, the conversion is a single multiplication by a fixed factor. That factor never changes, so the result is exact.
Convert the other way
Hectares to square miles →Related area conversions
- Acres to hectares
- Square meters to square feet
- Square feet to square meters
- Hectares to acres
- Square millimeters to hectares
- Square centimeters to hectares
- Square meters to hectares
- Square kilometers to hectares
- Square inches to hectares
- Square feet to hectares
- Square yards to hectares
- Square miles to square millimeters
Frequently asked questions
- How many hectares are in a square mile?
- There are 259 hectares in 1 square mile. The formula is ha = mi² × 258.998811.
- How do you convert square miles to hectares?
- Use the formula ha = mi² × 258.998811. For example, 10 square miles equals 2,589.99 hectares.
- Is the square miles to hectares conversion exact?
- Yes. Square miles and hectares are both units of area, related by an exact defined factor. Displayed results are rounded for readability.
- What is mi² short for?
- mi² is the standard symbol for square mile. ha is the symbol for hectare.