Square Feet to Acres Converter
Enter the area in square feet below to convert it to acres.
Convert Square Feet to Acres
Enter a value in square feet (ft²) to convert to acres (ac).
Square Foot to Acre Conversion Table
Table showing various square foot measurements converted to acres. Click any preset value or arrow to load it into the converter.
| Square Feet (ft²) | Acres (ac) |
|---|---|
| 1 ft² | 0.000022957 ac |
| 2 ft² | 0.000045914 ac |
| 5 ft² | 0.000114784 ac |
| 10 ft² | 0.000229568 ac |
| 15 ft² | 0.000344353 ac |
| 20 ft² | 0.000459137 ac |
| 25 ft² | 0.000573921 ac |
| 30 ft² | 0.000688705 ac |
| 50 ft² | 0.0011478 ac |
| 75 ft² | 0.0017218 ac |
How to Convert Square Feet to Acres
To convert square feet to acres, multiply the area by the following conversion ratio: 0.000022957 acres/square foot.
Since one square foot is equal to 0.000022957 acres, you can use this simple formula to convert:
The area in acres is equal to the area in square feet multiplied by 0.000022957.
For example, here's how to convert 43560 square feet to acres using the formula above.
How Many Acres Are in a Square Foot?
There are 0.000022957 acres in a square foot, which is why we use this value in the formula above.
Our square foot to acre calculator automatically converts your area measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Square Feet and acres are both units used to measure area. Keep reading to learn more about each unit.
What Is a Square Foot?
A square foot is a unit of area equal to 0.092903 square meters (m²), the base unit for area. Imperial area equal to 144 square inches (0.09290304 m²). [1]
The square foot is classified as a US customary and imperial unit of area. Square Feet can be abbreviated as ft²; for example, 1 square foot can be written as 1 ft².
When working with square feet (ft²) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, square feet (ft²) are widely used across standard area applications within US customary and imperial workflows, engineering documentation, and technical data sheets.
What Is an Acre?
An acre is a unit of area equal to 4,046.8564224 square meters (m²), the base unit for area. Imperial & US Customary land unit equal to 43,560 square feet. [2]
The acre is classified as a US customary and imperial unit of area. Acres can be abbreviated as ac; for example, 1 acre can be written as 1 ac.
When working with acres (ac) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, acres (ac) are widely used across large-scale industrial, bulk, and macro-level area specifications within US customary and imperial workflows, engineering documentation, and technical data sheets.
When converting area between square feet (ft²) and acres (ac), keep full floating-point precision (1 ft² = 0.000022957 ac; 1 ac = 43,560 ft²) during intermediate calculations and round only the final acre figure to match your instrument tolerance.
More Square Foot & Acre Conversions
Need to calculate in the opposite direction? Use our acres to square feet converter (ac to ft²) to switch your starting unit immediately. You can also explore related tools such as converting hectares to acres, converting square miles to acres, or converting square feet to square meters.
Convert from Square Feet
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length & Area)·Area Metrology Standard — Square Feet (ft²) to Acres (ac)
- [2]NIST HB 44 SpecificationNIST HB 44 (Acre, Hectare & Land Survey Tables)·Unit Specifications: Square Foot (ft²) & Acre (ac)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9 (Area))·Conversion Factors & Mathematical Basis (ft² to ac)