Square feet to Acres Converter
Convert square feet (ft²) to acres (ac) instantly. Type a value above and the result updates while you type. 1 square foot equals 0.000023 acres.
Result updates as you type. Values are calculated locally in your browser — nothing is sent to a server.
The formula
1 square foot = 0.000023 acres
Multiply the square feet value by 0.000023 to get acres. Or divide by 43,560 to go the other way.
Square feet to acres conversion table
| ft² | ac |
|---|---|
| 1 | 0.000023 |
| 2 | 0.000046 |
| 3 | 0.000069 |
| 4 | 0.000092 |
| 5 | 0.000115 |
| 6 | 0.000138 |
| 7 | 0.000161 |
| 8 | 0.000184 |
| 9 | 0.000207 |
| 10 | 0.00023 |
| 15 | 0.000344 |
| 20 | 0.000459 |
| 25 | 0.000574 |
| 50 | 0.001148 |
| 75 | 0.001722 |
| 100 | 0.002296 |
Worked examples
- 5 ft² × 0.000023 = 0.000115 ac
- 30 ft² × 0.000023 = 0.000689 ac
- 165 ft² × 0.000023 = 0.003788 ac
Conversion factors follow the exact international definitions (SI/BIPM; imperial units per the 1959 International Yard and Pound Agreement, maintained by NIST). NIST unit conversion reference
Factors last verified August 2026 · Built by Jeffrey Tepper.
Looking for the other direction?
Frequently asked questions
How many acres are in 1 square foot?
1 square foot equals 0.000023 acres (ft² → ac).
How do you convert square feet to acres?
Multiply the number of square feet by 0.000023. For example: 10 ft² × 0.000023 = 0.00023 ac.
What is 50 ft² in ac?
50 ft² equals 0.001148 ac.
Which is bigger: 1 square foot or 1 acre?
1 acre is bigger: 1 square foot is only 0.000023 acres.