📏 Square feet to Acres Converter
Convert square feet (ft²) to acres (ac) instantly, with the formula, a worked example and a conversion table.
Quick answer: 1 square foot (ft²) = 0.0000229568 acres (ac). Formula: ac = ft² × 0.0000229568.
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Square feet to Acres Converter inputs
Result
Square feet to Acres conversion table
| Square feet (ft²) | Acres (ac) |
|---|---|
| 0.1 ft² | 0.0000022957 ac |
| 0.5 ft² | 0.0000114784 ac |
| 1 ft² | 0.0000229568 ac |
| 2 ft² | 0.0000459137 ac |
| 3 ft² | 0.0000688705 ac |
| 5 ft² | 0.0001147842 ac |
| 10 ft² | 0.0002295684 ac |
| 20 ft² | 0.0004591368 ac |
| 25 ft² | 0.000573921 ac |
| 50 ft² | 0.0011478421 ac |
| 100 ft² | 0.0022956841 ac |
| 1,000 ft² | 0.022956841 ac |
Other area conversions
How to convert square feet to acres
Multiply the number of square feet by 0.0000229568 to get acres: ac = ft² × 0.0000229568.
Example: 5 ft² = 0.0001147842 ac.
The square foot (ft²) and the acre (ac) are both units of area. Need the opposite direction? Use the ac to ft² converter.
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Metric and imperial units
The metric system (SI) is used by almost every country and by science worldwide. Its units scale by powers of ten – 1 kilometer is 1,000 meters, 1 meter is 100 centimeters – which makes conversions inside the system easy. The imperial and US customary systems (inches, feet, pounds, gallons) are still used daily in the United States and partly in the UK.
Since 1959 the inch has been defined as exactly 2.54 centimeters and the pound as exactly 0.45359237 kilograms, so conversions between the two systems are exact. Note that a US gallon (3.785 L) and an imperial gallon (4.546 L) are different – choose the right one above.
This converter covers 10 categories and 66 units: length, weight, temperature, volume, area, speed, time, data, energy, pressure.
Frequently asked questions
How many acres are in a square foot?
1 square foot = 0.0000229568 acres.
How do I convert square feet to acres?
Use the formula ac = ft² × 0.0000229568. For example, 5 ft² = 0.0001147842 ac.
How do I convert acres back to square feet?
1 acre = 43,560 square feet. Use the ac to ft² converter linked on this page.
Are these conversions exact?
Yes – all factors use the internationally defined values (for example 1 inch = 2.54 cm exactly, 1 pound = 0.45359237 kg exactly). Results are rounded to 8 significant digits for display.