Square Feet to Acres Converter
1 square foot is about 0.0000229568 acres. To convert square feet to acres, divide by 43,560.
Sources: NIST SP 811, NIST Handbook 44, NIST U.S. survey foot, UK Weights and Measures Act 1985 Updated
Result
10,000 ft² = 0.229568 ac
How to convert square feet to acres
acres = square feet ÷ 43,560
1 square foot is exactly 0.09290304 square meter (0.3048²). 1 acre is 43,560 square feet, exactly 4,046.8564224 square meters.
Dividing by 43,560 is exact. Written as a multiplication the factor is a repeating decimal, 1 ft² = 0.00002295684113866… ac, so a rounded multiplier such as 0.00002296 is slightly off. This converter keeps the exact fraction (1/43560) and rounds only the result it shows.
Worked example: 20,000 ft²
- Start with the value in square feet: 20,000 ft².
- Divide by 43,560, because 1 acre = 43,560 square feet: 20,000 ÷ 43,560 = 0.4591368228….
- Round to the precision you need: 0.46 ac to two decimals.
Square Feet to acres chart
Square feet from 1,000 to 100,000 converted to acres with the exact factor, shown to five significant digits.
| ft² | ac |
|---|---|
| 1,000 | 0.02296 |
| 2,000 | 0.04591 |
| 3,000 | 0.06887 |
| 4,000 | 0.09183 |
| 5,000 | 0.1148 |
| 6,000 | 0.1377 |
| 7,000 | 0.1607 |
| 8,000 | 0.1837 |
| 9,000 | 0.2066 |
| 10,000 | 0.2296 |
| 11,000 | 0.2525 |
| 12,000 | 0.2755 |
| 13,000 | 0.2984 |
| 14,000 | 0.3214 |
| 15,000 | 0.3444 |
| 16,000 | 0.3673 |
| 17,000 | 0.3903 |
| 18,000 | 0.4132 |
| 19,000 | 0.4362 |
| 20,000 | 0.4591 |
| 21,000 | 0.4821 |
| 22,000 | 0.5051 |
| 23,000 | 0.528 |
| 24,000 | 0.551 |
| 25,000 | 0.5739 |
| ft² | ac |
|---|---|
| 26,000 | 0.5969 |
| 27,000 | 0.6198 |
| 28,000 | 0.6428 |
| 29,000 | 0.6657 |
| 30,000 | 0.6887 |
| 31,000 | 0.7117 |
| 32,000 | 0.7346 |
| 33,000 | 0.7576 |
| 34,000 | 0.7805 |
| 35,000 | 0.8035 |
| 36,000 | 0.8264 |
| 37,000 | 0.8494 |
| 38,000 | 0.8724 |
| 39,000 | 0.8953 |
| 40,000 | 0.9183 |
| 41,000 | 0.9412 |
| 42,000 | 0.9642 |
| 43,000 | 0.9871 |
| 44,000 | 1.01 |
| 45,000 | 1.033 |
| 46,000 | 1.056 |
| 47,000 | 1.079 |
| 48,000 | 1.102 |
| 49,000 | 1.125 |
| 50,000 | 1.148 |
| ft² | ac |
|---|---|
| 51,000 | 1.171 |
| 52,000 | 1.194 |
| 53,000 | 1.217 |
| 54,000 | 1.24 |
| 55,000 | 1.263 |
| 56,000 | 1.286 |
| 57,000 | 1.309 |
| 58,000 | 1.331 |
| 59,000 | 1.354 |
| 60,000 | 1.377 |
| 61,000 | 1.4 |
| 62,000 | 1.423 |
| 63,000 | 1.446 |
| 64,000 | 1.469 |
| 65,000 | 1.492 |
| 66,000 | 1.515 |
| 67,000 | 1.538 |
| 68,000 | 1.561 |
| 69,000 | 1.584 |
| 70,000 | 1.607 |
| 71,000 | 1.63 |
| 72,000 | 1.653 |
| 73,000 | 1.676 |
| 74,000 | 1.699 |
| 75,000 | 1.722 |
| ft² | ac |
|---|---|
| 76,000 | 1.745 |
| 77,000 | 1.768 |
| 78,000 | 1.791 |
| 79,000 | 1.814 |
| 80,000 | 1.837 |
| 81,000 | 1.86 |
| 82,000 | 1.882 |
| 83,000 | 1.905 |
| 84,000 | 1.928 |
| 85,000 | 1.951 |
| 86,000 | 1.974 |
| 87,000 | 1.997 |
| 88,000 | 2.02 |
| 89,000 | 2.043 |
| 90,000 | 2.066 |
| 91,000 | 2.089 |
| 92,000 | 2.112 |
| 93,000 | 2.135 |
| 94,000 | 2.158 |
| 95,000 | 2.181 |
| 96,000 | 2.204 |
| 97,000 | 2.227 |
| 98,000 | 2.25 |
| 99,000 | 2.273 |
| 100,000 | 2.296 |
acres = square feet ÷ 43,560. Factors: NIST SP 811, NIST Handbook 44, NIST U.S. survey foot, UK Weights and Measures Act 1985. unitcheck.net/area/square-feet-to-acres/
Which acre?
An acre is 43,560 square feet. Until the end of 2022 the US acre was tied to the US survey foot, which made it 4,046.873 m². Since January 1, 2023 NIST bases it on the international foot, giving exactly 4,046.8564224 m². The two differ by about 4 parts in a million, which only matters in land surveying.
Frequently asked questions
How many acres are in 1 square foot?
1 square foot is about 0.0000229568 acres. 1 square foot is exactly 0.09290304 square meter (0.3048²).
How do I convert square feet to acres?
Divide by 43,560: acres = square feet ÷ 43,560. For example, 20,000 ft² = 0.46 ac.
How many square feet are in 1 acre?
1 acre is exactly 43,560 square feet. Press Swap on the converter to go the other way.
Is the ft² to ac conversion exact?
The relationship is exact (1 ac = 43,560 ft²), but 1 ÷ 43,560 is a repeating decimal, 0.00002295684114…. The converter works with the exact fraction and rounds only the displayed result, so it does not pick up the small error a rounded multiplier would cause.
Sources
- NIST Special Publication 811, Guide for the Use of the International System of Units, Appendix B.8: Factors for Units Listed Alphabetically — exact factors are printed in bold in the NIST table (checked October 12, 2026)
- NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement — US customary units and their exact relationships (checked October 12, 2026)
- NIST: U.S. survey foot (deprecated on January 1, 2023) — the acre and the square mile are now based on the international foot (checked October 12, 2026)
- Weights and Measures Act 1985 (UK), Schedule 1: Definitions of Units of Measurement — imperial gallon, pint and fluid ounce, stone and long ton (checked October 12, 2026)