Square Miles to Hectares Converter
1 square mile ≈ 258.998811 hectares
1 square mile equals 258.999 hectares
How to convert square miles to hectares
Area factors are squared length factors: 1 ft² = (0.3048 m)². The acre here uses international feet; historic US survey acres differ slightly.
ha = mi² × 258.998811One square mile is 258.998811 hectares, so a single multiplication converts any value.
2,589.99 ha ≈ 10 × 258.998811Square miles to hectares conversion table
Common values in square miles, converted to hectares.
| Square miles (mi²) | Hectares (ha) |
|---|---|
| 1 | 258.99881 |
| 2 | 517.99762 |
| 3 | 776.99643 |
| 4 | 1,035.9952 |
| 5 | 1,294.9941 |
| 10 | 2,589.9881 |
| 20 | 5,179.9762 |
| 25 | 6,474.9703 |
| 50 | 12,949.941 |
| 100 | 25,899.881 |
| 250 | 64,749.703 |
| 500 | 129,499.41 |
| 1,000 | 258,998.81 |
About these units
square milemi²
Exactly 640 acres. Used for county and country areas.
hectareha
Exactly 10,000 square metres, a square 100 m on each side. The metric land unit.
Sources and precision
Table results are rounded to 8 significant digits; formula constants may be rounded to 10. Worked example answers use 6 significant digits. The converter starts at 6 significant digits and lets you change display precision. Calculations use the stored factors without intermediate rounding. Exact unit definitions do not make an input measurement more precise; conventional and measured factors follow the assumptions stated here.