Convert square feet to acres
Converting square feet to acres is a common area task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 ft² equals 0.0000229568 ac, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert square feet to acres
To convert square feet to acres, multiply the number of square feet by 0.0000229568. For example, 10 ft² × 0.0000229568 = 0.000229568 ac.
ac = ft² × 0.0000229568
- Write down the value in square feet you want to convert.
- Multiply it by 0.0000229568 (the exact ft²→ac factor).
- The result is your value in acres. Check it below with the converter or the table.
Conversion table
Common values of square feet and their equivalents in acres:
| ft² | ac |
|---|---|
| 1 | 0.0000229568 |
| 2 | 0.0000459137 |
| 3 | 0.0000688705 |
| 4 | 0.0000918274 |
| 5 | 0.000114784 |
| 10 | 0.000229568 |
| 20 | 0.000459137 |
| 25 | 0.000573921 |
| 50 | 0.00114784 |
| 100 | 0.00229568 |
| 250 | 0.00573921 |
| 500 | 0.0114784 |
About these units
Square Foot (ft²). A square foot is a square with one-foot (30.48 cm) sides, exactly 0.09290304 square meters. It is the standard unit for homes and offices in the United States.
Acre (ac). An acre equals exactly 4,046.8564224 square meters, or 43,560 square feet. It is the traditional land unit in the US and UK, about 0.4 hectares.
Frequently asked questions
How do I convert square feet to acres?
To convert square feet to acres, multiply the number of square feet by 0.0000229568. For example, 10 ft² × 0.0000229568 = 0.000229568 ac. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many acres are in 1 square foot?
1 ft² = 0.0000229568 ac. That is the fixed relationship used by this converter and by international standards.
How many square feet are in 1 acre?
1 ac = 43,560 ft². If you are converting in the opposite direction, use our Acre to Square Foot converter for the dedicated table and FAQ.
Is the square feet to acres conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.0000229568 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is square foot used for?
A square foot is a square with one-foot (30.48 cm) sides, exactly 0.09290304 square meters. It is the standard unit for homes and offices in the United States.