This square feet to acres converter gives you the sq ft to ac result instantly, in your browser, with the exact ratio so you can verify it. 1 square foot is about 0.0000229568 acres, and going the other way, 1 acre is 43,560 square feet. Square feet are an imperial unit still common in the United States and the United Kingdom; acres are an imperial unit still common in the United States and the United Kingdom.
To convert by hand, multiply the number of square feet by 0.0000229568. For example, 10 square feet is 0.000229568 acres and 100 square feet is 0.00229568 acres. The table below lists the most requested values, and the converter above accepts decimals for anything in between.
sq ft to ac formula
ac = sq ft × 0.0000229568
1 square foot is about 0.0000229568 acres. Multiply the value in square feet by that factor to get acres.
Square feet to Acres conversion table
| square feet | acres | Rounded |
|---|---|---|
| 1 sq ft | 0.0000229568 ac | 0.000023 |
| 2 sq ft | 0.0000459137 ac | 0.0000459 |
| 3 sq ft | 0.0000688705 ac | 0.0000689 |
| 4 sq ft | 0.0000918274 ac | 0.0000918 |
| 5 sq ft | 0.000114784 ac | 0.000115 |
| 6 sq ft | 0.000137741 ac | 0.000138 |
| 7 sq ft | 0.000160698 ac | 0.000161 |
| 8 sq ft | 0.000183655 ac | 0.000184 |
| 9 sq ft | 0.000206612 ac | 0.000207 |
| 10 sq ft | 0.000229568 ac | 0.00023 |
| 12 sq ft | 0.000275482 ac | 0.000275 |
| 15 sq ft | 0.000344353 ac | 0.000344 |
| 20 sq ft | 0.000459137 ac | 0.000459 |
| 25 sq ft | 0.000573921 ac | 0.000574 |
| 30 sq ft | 0.000688705 ac | 0.000689 |
| 40 sq ft | 0.000918274 ac | 0.000918 |
| 50 sq ft | 0.00114784 ac | 0.00115 |
| 60 sq ft | 0.00137741 ac | 0.00138 |
| 70 sq ft | 0.00160698 ac | 0.00161 |
| 75 sq ft | 0.00172176 ac | 0.00172 |
| 80 sq ft | 0.00183655 ac | 0.00184 |
| 90 sq ft | 0.00206612 ac | 0.00207 |
| 100 sq ft | 0.00229568 ac | 0.0023 |
| 150 sq ft | 0.00344353 ac | 0.00344 |
| 200 sq ft | 0.00459137 ac | 0.00459 |
| 250 sq ft | 0.00573921 ac | 0.00574 |
| 300 sq ft | 0.00688705 ac | 0.00689 |
| 500 sq ft | 0.0114784 ac | 0.0115 |
| 750 sq ft | 0.0172176 ac | 0.0172 |
| 1,000 sq ft | 0.0229568 ac | 0.023 |
Frequently asked questions
How many acres are in 5 square feet?
5 sq ft = 0.000114784 ac. Multiply 5 by 0.0000229568, the number of acres in one square foot. The converter on this page does the same arithmetic for any value, including decimals.
What is the formula to convert square feet to acres?
ac = sq ft × 0.0000229568. The factor comes from the definitions of the units: 1 square foot is about 0.0000229568 acres. Worked example: 12 sq ft = 0.000275482 ac.
Is 30 sq ft the same as 0.000688705 ac?
Yes. 30 sq ft = 0.000688705 ac. Rounded to four decimals it is 0.0006887 ac.
How do I convert acres back to square feet?
Divide by 0.0000229568, or multiply by 43,560: 1 acre is 43,560 square feet. The acres to square feet page linked above lists common values the other way.
Is the sq ft to ac conversion exact?
1 square foot is about 0.0000229568 acres. The ratio is a defined constant but produces a long decimal, so this page rounds to six significant digits, which is more precision than any everyday measurement needs.