Convert square miles to hectares
1 mi² = 258.998811034 ha — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
258.998 811 034ha
Exact decimal: 258.9988110336
As a fraction: 2529285264/9765625
1 mi² = 258.998811034 ha
How to convert square miles to hectares
Multiply the number of square miles by 258.998811034 to get hectares.
The exact factor is 258.9988110336 — as a fraction, 2529285264/9765625.
Hectare: The standard land-area unit almost everywhere outside the US.
Square mile to Hectare conversion table
| Square miles (mi²) | Hectares (ha) |
|---|---|
| 1 mi² | 258.998 81 |
| 2 mi² | 517.997 62 |
| 3 mi² | 776.996 43 |
| 5 mi² | 1294.9941 |
| 10 mi² | 2589.9881 |
| 20 mi² | 5179.9762 |
| 25 mi² | 6474.9703 |
| 50 mi² | 12 949.941 |
| 100 mi² | 25 899.881 |
| 250 mi² | 64 749.703 |
| 500 mi² | 129 499.41 |
| 1000 mi² | 258 998.81 |
Hectare to Square mile conversion table
| Hectares (ha) | Square miles (mi²) |
|---|---|
| 1 ha | 0.003 861 021 6 |
| 2 ha | 0.007 722 043 2 |
| 3 ha | 0.011 583 065 |
| 5 ha | 0.019 305 108 |
| 10 ha | 0.038 610 216 |
| 20 ha | 0.077 220 432 |
| 25 ha | 0.096 525 54 |
| 50 ha | 0.193 051 08 |
| 100 ha | 0.386 102 16 |
| 250 ha | 0.965 255 4 |
| 500 ha | 1.930 510 8 |
| 1000 ha | 3.861 021 6 |
Frequently asked
How many hectares are in a square mile?
One square mile equals 258.998811 hectares (mi² → ha). That figure is exact, not rounded.
How do you convert square miles to hectares?
Multiply the number of square miles by 258.998811034 to get hectares.
What is 1 ha in square miles?
One hectare is 0.003861021585 square miles.
What is 10 mi² in ha?
10 mi² = 2589.9881 ha.
What exactly is a hectare?
The standard land-area unit almost everywhere outside the US.