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Area
Square feet to Acres
Convert square feet (ft²) to acres (ac). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 ft² = 2.2957e-5 ac
Square feet to Acres Conversion Table
Common values, ready to copy:
| square feet | acres |
|---|---|
| 1 ft² | 2.2957e-5 ac |
| 2 ft² | 4.5914e-5 ac |
| 5 ft² | 0.000115 ac |
| 10 ft² | 0.00023 ac |
| 25 ft² | 0.000574 ac |
| 50 ft² | 0.001148 ac |
| 100 ft² | 0.002296 ac |
| 1,000 ft² | 0.022957 ac |
Formula
acres = square feet × 2.29568110e-5
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 feet and Acres
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.
Acres (ac): An old English unit, originally the area a yoke of oxen could plow in a day; standardized at exactly 4,046.86 m² (43,560 sq ft). Common uses: Land area in the US, UK, and most former British colonies — farm sizes, residential lots, and ranch acreage.
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 acres = square feet × 2.29568110e-5, 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 feet and acres 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.