Convert Square Feet to Acres (ft2 to ac)
1 square foot (ft²) = 0.00002295684114 acres (ac). 1 ac = 43560 ft². Example: 10000 ft² = 10000 × 0.00002295684114 = 0.2295684114 ac.
Also searched as square feet to ac, square feet in ac, square feet into acres, ft2 to ac, ft2 in acres, ft2 into acre, square foot to acre, ft2 to acres converter and how many acres in a square foot.
1 ft² = 0.00002295684114 ac
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk square foot to acre converter to paste a column from Excel.
How to Convert Square Foot to Acre
- 1 ft² = 0.00002295684114 ac
- 1 ac = 43560 ft²
- Example: convert 10000 ft² to ac: 10000 ft² = 10000 × 0.00002295684114 ac = 0.2295684114 ac
Formula
ac = ft² ÷ 43560
Derivation from SI units:
- 1 ft² = (0.3048 m)² = 0.09290304 m²
- 1 acre = 43 560 ft² = 4 046.856 422 4 m² (international foot; the US survey foot was retired at the end of 2022)
- 1 ft² = 0.09290304 m² ÷ 4046.8564224 m² per ac = 0.00002295684113866 ac
Both units are defined exactly, so the factor is exact. Square Foot definition: square foot; Acre definition: acre.
Worked examples
- A 10000 ft² lot is 0.2295684114 ac.
10000 ft² × 0.00002295684114 = 0.2295684114 ac - 43560 ft² is exactly 1 ac.
43560 ft² × 0.00002295684114 = 1 ac
Square Foot to Acre conversion table
| Square Feet (ft²) | Acres (ac) |
|---|---|
| 0.1 ft² | 0.000002295684114 ac |
| 0.25 ft² | 0.000005739210285 ac |
| 0.5 ft² | 0.00001147842057 ac |
| 1 ft² | 0.00002295684114 ac |
| 2 ft² | 0.00004591368228 ac |
| 4 ft² | 0.00009182736455 ac |
| 5 ft² | 0.0001147842057 ac |
| 10 ft² | 0.0002295684114 ac |
| 25 ft² | 0.0005739210285 ac |
| 50 ft² | 0.001147842057 ac |
| 100 ft² | 0.002295684114 ac |
| 200 ft² | 0.004591368228 ac |
| 500 ft² | 0.01147842057 ac |
| 1000 ft² | 0.02295684114 ac |
| 1500 ft² | 0.03443526171 ac |
| 2000 ft² | 0.04591368228 ac |
| 2500 ft² | 0.05739210285 ac |
| 5000 ft² | 0.1147842057 ac |
| 43560 ft² | 1 ac |
Where it's used
Plot and building areas in square feet are converted to acres for land listings, zoning and farm records. Divide by 43 560.
Square Foot to other area units
| Conversion | 1 ft² equals |
|---|---|
| square foot to acre | 0.00002295684114 ac |
| square foot to square meter | 0.09290304 m² |
| square foot to square centimeter | 929.0304 cm² |
| square foot to square inch | 144 in² |
| square foot to hectare | 0.000009290304 ha |
| square foot to square millimeter | 92903.04 mm² |
| square foot to square kilometre | 9.290304 × 10⁻⁸ km² |
| square foot to square yard | 0.1111111111 yd² |
Show 1 more units
| square foot to square mile | 3.587006428 × 10⁻⁸ mi² |
|---|
Frequently asked questions
How do I convert square feet to acres?
Divide by 43 560: 10 000 ft² = 0.2295684114 ac.
How many acres are in 1 square foot?
1 ft² = 0.00002295684114 ac.
Is the ft² to ac conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "square foot (ft²)".
- NIST Handbook 44, Appendix C: General Tables of Units of Measurement, National Institute of Standards and Technology , Appendix C, units of area.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Square Feet to Acres (ft2 to ac). Retrieved October 25, 2026, from https://scientificconverters.com/area/square-feet-to-acres/
IEEE
Scientific Converters, "Convert Square Feet to Acres (ft2 to ac)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/area/square-feet-to-acres/