Convert Acres to Square Feet (ac to ft2)
1 acre (ac) = 43560 square feet (ft²). 1 ft² = 0.00002295684114 ac. Example: 0.25 ac = 0.25 × 43560 = 10890 ft².
Also searched as acres to ft2, acres in ft2, acres into square feet, ac to ft2, ac in square feet, ac into square foot, acre to square foot, ac to square feet converter and how many square feet in an acre.
1 ac = 43560 ft²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk acre to square foot converter to paste a column from Excel.
How to Convert Acre to Square Foot
- 1 ac = 43560 ft²
- 1 ft² = 0.00002295684114 ac
- Example: convert 0.25 ac to ft²: 0.25 ac = 0.25 × 43560 ft² = 10890 ft²
Formula
ft² = ac × 43560
Derivation from SI units:
- 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 = (0.3048 m)² = 0.09290304 m²
- 1 ac = 4046.8564224 m² ÷ 0.09290304 m² per ft² = 43560 ft²
Both units are defined exactly, so the factor is exact. Acre definition: acre; Square Foot definition: square foot.
Worked examples
- 1 ac is 43560 ft².
1 ac × 43560 = 43560 ft² - A quarter-acre lot, 0.25 ac, is 10890 ft².
0.25 ac × 43560 = 10890 ft²
Acre to Square Foot conversion table
| Acres (ac) | Square Feet (ft²) |
|---|---|
| 0.1 ac | 4356 ft² |
| 0.25 ac | 10890 ft² |
| 0.5 ac | 21780 ft² |
| 1 ac | 43560 ft² |
| 2 ac | 87120 ft² |
| 2.47105 ac | 107638.938 ft² |
| 5 ac | 217800 ft² |
| 10 ac | 435600 ft² |
| 20 ac | 871200 ft² |
| 40 ac | 1742400 ft² |
| 100 ac | 4356000 ft² |
| 160 ac | 6969600 ft² |
| 640 ac | 27878400 ft² |
Where it's used
Acres are converted to square feet to size house plots, lawns and building footprints. One acre is exactly 43 560 ft².
Acre to other area units
| Conversion | 1 ac equals |
|---|---|
| acre to square foot | 43560 ft² |
| acre to square meter | 4046.856422 m² |
| acre to square centimeter | 40468564.22 cm² |
| acre to square inch | 6272640 in² |
| acre to hectare | 0.4046856422 ha |
| acre to square millimeter | 4046856422 mm² |
| acre to square kilometre | 0.004046856422 km² |
| acre to square yard | 4840 yd² |
Show 1 more units
| acre to square mile | 0.0015625 mi² |
|---|
Frequently asked questions
How many square feet are in an acre?
Exactly 43 560 ft², about 208.7 ft × 208.7 ft as a square.
How many square feet are in 1 acre?
1 ac = 43560 ft².
How do I convert acres to square feet?
Multiply the value in ac by 43560. For example, 0.25 ac × 43560 = 10890 ft².
Is the ac to ft² conversion exact?
Yes. Both units are defined exactly, and 1 ac is exactly 43560 ft².
Sources
- NIST Handbook 44, Appendix C: General Tables of Units of Measurement, National Institute of Standards and Technology , Appendix C, units of area.
- 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)".
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 Acres to Square Feet (ac to ft2). Retrieved October 25, 2026, from https://scientificconverters.com/area/acres-to-square-feet/
IEEE
Scientific Converters, "Convert Acres to Square Feet (ac to ft2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/area/acres-to-square-feet/