Convert square miles to hectares
Enter a square miles value below and convert to hectares
mi²
1 square mile ≈
258.999 hectares
* rounded result
Select how many decimal places the result will be rounded to:
How to convert square miles to hectares
To convert square miles to hectares, multiply a square miles value by 258.9988110336.
Formula ha = mi² × 258.9988110336
Example: Convert 0.5 square miles to hectares Calculations: 0.5 mi² × 258.9988110336 ≈ 129.499 ha
Square mile (mi²)
The square mile is the imperial system's unit of area, defined as the area of a square with sides of 1 mile. It is equal to about 2.59 square kilometers.
Hectare (ha)
The hectare is a unit of area in the metric system, defined as the area of a square with sides of 100 meters. It is equal to about 2.4711 acres.