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Area
Hectares to Square miles
Convert hectares (ha) to square miles (mi²). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 ha = 0.003861 mi²
Hectares to Square miles Conversion Table
Common values, ready to copy:
| hectares | square miles |
|---|---|
| 1 ha | 0.003861 mi² |
| 2 ha | 0.007722 mi² |
| 5 ha | 0.019305 mi² |
| 10 ha | 0.03861 mi² |
| 25 ha | 0.096526 mi² |
| 50 ha | 0.193051 mi² |
| 100 ha | 0.386102 mi² |
| 1,000 ha | 3.861 mi² |
Formula
square miles = hectares × 3.86102159e-3
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 Hectares and Square miles
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.
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.
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 square miles = hectares × 3.86102159e-3, 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 hectares and square miles 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.