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Area
Square miles to Square feet
Convert square miles (mi²) to square feet (ft²). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 mi² = 2.7878e+7 ft²
Square miles to Square feet Conversion Table
Common values, ready to copy:
| square miles | square feet |
|---|---|
| 1 mi² | 2.7878e+7 ft² |
| 2 mi² | 5.5757e+7 ft² |
| 5 mi² | 1.3939e+8 ft² |
| 10 mi² | 2.7878e+8 ft² |
| 25 mi² | 6.9696e+8 ft² |
| 50 mi² | 1.3939e+9 ft² |
| 100 mi² | 2.7878e+9 ft² |
| 1,000 mi² | 2.7878e+10 ft² |
Formula
square feet = square miles × 2.78784120e+7
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 Square feet
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.
Square feet (ft²): One foot squared, or 0.092903 m²; the dominant area unit in US real estate. Common uses: Home and apartment sizing in the United States, commercial real estate, lawn areas, and US construction blueprints.
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 feet = square miles × 2.78784120e+7, 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 square feet 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.