Convert Square Miles to Hectares
One square mile equals 258.9988 hectares. Type any value to convert square miles to hectares instantly — with a full reference table below.
Convert Square Miles to Hectares
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How to convert Square Miles to Hectares
To convert square miles to hectares, multiply by 258.9988. One square mile equals 258.9988 ha, and one hectare equals 0.00386102 mi².
- Take the value in square miles — for example 7.5 mi².
- Multiply by 258.9988 (the number of hectares in one square mile).
- 7.5 × 258.9988 = 1,942.491 ha.
Quick mental estimate: Multiply the number of square miles by 259 (accurate to better than 0.05%).
Square Miles to Hectares conversion table
| Square Miles | Hectares |
|---|---|
| 1 mi² | 258.9988 ha |
| 2 mi² | 517.9976 ha |
| 3 mi² | 776.9964 ha |
| 5 mi² | 1,294.994 ha |
| 10 mi² | 2,589.988 ha |
| 20 mi² | 5,179.976 ha |
| 50 mi² | 12,949.94 ha |
| 100 mi² | 25,899.88 ha |
| 200 mi² | 51,799.76 ha |
| 500 mi² | 129,499.4 ha |
| 1,000 mi² | 258,998.8 ha |
| 5,000 mi² | 1,294,994 ha |
| Hectares | Square Miles |
|---|---|
| 1 ha | 0.00386102 mi² |
| 2 ha | 0.00772204 mi² |
| 3 ha | 0.0115831 mi² |
| 5 ha | 0.0193051 mi² |
| 10 ha | 0.0386102 mi² |
| 20 ha | 0.0772204 mi² |
| 50 ha | 0.193051 mi² |
| 100 ha | 0.386102 mi² |
| 200 ha | 0.772204 mi² |
| 500 ha | 1.930511 mi² |
| 1,000 ha | 3.861022 mi² |
| 5,000 ha | 19.30511 mi² |
About converting Square Miles to Hectares
Square Miles (mi²) and Hectares (ha) are both units of area. The exact factor is 1 mi² = 258.9988 ha, so multiply by 258.9988 to go from square miles to hectares (or divide to go back).
The conversion runs entirely in your browser. Need the reverse? Use the Hectares to Square Miles converter, or the full unit converter for every unit at once.
Real-world area in square miles and hectares
| Example | Square Miles | Hectares |
|---|---|---|
| A doubles tennis court (23.77 × 10.97 m) | 0.000100679 mi² | 0.0260757 ha |
| An NBA basketball court (94 × 50 ft) | 0.000168589 mi² | 0.0436644 ha |
| An American football field (incl. end zones) | 0.00206612 mi² | 0.535122 ha |
| A football pitch (105 × 68 m) | 0.00275677 mi² | 0.714 ha |
| One acre | 0.0015625 mi² | 0.404686 ha |
“≈” marks typical values; the rest are defined or measured figures.
The units
A square 1 mile on each side: 640 acres, about 2.59 km².
Used for: US/UK land and city areas.
10,000 m² — a square 100 m on each side.
Used for: Farmland and land records in metric countries.
Area factors are the squares of exact length factors, so they are exact too (an international acre is exactly 4,046.8564224 m²).