Square Feet to Acres (ft² to ac) Converter
1 square foot equals 2.295684e-5 acres — divide the number of square feet by 43,560 (or multiply by 2.295684e-5) to convert. An acre is defined as 43,560 square feet, so a single square foot is a tiny fraction of an acre.
The formula
To convert square feet to acres, multiply by the exact factor:
acres = square feet × 2.295684e-5
For example, 43560 ft² × 2.295684e-5 = 1 acre. To reverse, divide by 2.295684e-5 or multiply by 43,560.
Conversion table
| Square Feet (ft²) | Acres (ac) |
|---|---|
| 1 | 0.0000229568 |
| 10 | 0.0002295684 |
| 50 | 0.0011478420 |
| 100 | 0.0022956841 |
| 500 | 0.0114784205 |
| 1000 | 0.0229568411 |
| 5000 | 0.1147842053 |
| 10000 | 0.2295684114 |
| 43560 | 1 |
| 100000 | 2.2956841 |
How to convert online
- Type the number of square feet into the first box.
- Read the equivalent acres instantly in the second box.
- Or enter an acre value to convert back to square feet — it works both ways.
Use the Square Foot to Acre Converter — free and instant in your browser.
Where this conversion is used
Square-feet-to-acres conversion is essential in real estate, land development, farming, and zoning, where lot sizes are listed in square feet but bought, taxed, or planned in acres. It quickly tells you what fraction of an acre a parcel or building footprint covers.
FAQ
How many acres are in a square foot?
One square foot equals 2.295684e-5 acres. Multiply square feet by 2.295684e-5 — for example, 10,000 ft² = 0.2295684 acres.
What is the formula to convert square feet to acres?
Acres = square feet × 2.295684e-5, the same as dividing square feet by 43,560.
How do I convert acres back to square feet?
Multiply by 43,560. So 1 acre = 43,560 square feet and 2 acres = 87,120 square feet.
Is the conversion exact?
Yes. An acre is defined as exactly 43,560 square feet, so the conversion is precise; 2.295684e-5 is 1/43,560 rounded.
Related converters
- Acre to Square Foot Converter
- Square Foot to Square Meter Converter
- Square Foot to Square Yard Converter
- Square Foot to Hectare Converter
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