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Area
Square miles to Hectares
Convert square miles (mi²) to hectares (ha). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 mi² = 259 ha
Square miles to Hectares Conversion Table
Common values, ready to copy:
| square miles | hectares |
|---|---|
| 1 mi² | 259 ha |
| 2 mi² | 518 ha |
| 5 mi² | 1294.99 ha |
| 10 mi² | 2589.99 ha |
| 25 mi² | 6474.97 ha |
| 50 mi² | 12949.94 ha |
| 100 mi² | 25899.88 ha |
| 1,000 mi² | 258998.81 ha |
Formula
hectares = square miles × 258.998811
Area conversions are derived from length: 1 ft² = (0.3048 m)² = 0.092903 m². 1 acre = 4,046.86 m². 1 hectare = 10,000 m² exactly.
About Square miles and Hectares
Square miles (mi²): One mile squared, or 2.59 km²; the standard US unit for large land areas. Common uses: City and county area, state and national park sizes, watersheds, and large geographic features in the US.
Hectares (ha): Ten thousand square meters, or 100 m × 100 m; from the Greek hekaton meaning hundred (referring to the hundred-fold of an are, an obscure unit). Common uses: Land area in metric countries — agriculture, forestry, real estate (especially rural), and conservation.
How the conversion works
Area conversions are derived from length: 1 ft² = (0.3048 m)² = 0.092903 m². 1 acre = 4,046.86 m². 1 hectare = 10,000 m² exactly.
The exact relationship is hectares = square miles × 258.998811, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between square miles and hectares comes up wherever area measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.