Square Feet to Acres
Convert square feet (ft²) to acres (ac). Both measure surface measurement, and the conversion comes up in real estate, farming, construction work.
The Formula
``
acres = square feet × 0.0000229568411387
square feet = acres × 43560
`
One square feet is 2.2957e-5 acres, and one acre is 43,560 square feet.
Conversion Table
| Square Feet | Acres |
|---|---|
| 1 ft² | 2.2957e-5 ac |
| 2 ft² | 4.5914e-5 ac |
| 5 ft² | 1.1478e-4 ac |
| 10 ft² | 2.2957e-4 ac |
| 25 ft² | 5.7392e-4 ac |
| 50 ft² | 0.001148 ac |
| 100 ft² | 0.002296 ac |
| 500 ft² | 0.011478 ac |
| 1,000 ft² | 0.022957 ac |
The Other Direction
| Acres | Square Feet |
|---|---|
| 1 ac | 43,560 ft² |
| 2 ac | 87,120 ft² |
| 5 ac | 217,800 ft² |
| 10 ac | 435,600 ft² |
| 25 ac | 1,089,000 ft² |
| 50 ac | 2,178,000 ft² |
| 100 ac | 4,356,000 ft² |
| 500 ac | 21,780,000 ft² |
| 1,000 ac | 43,560,000 ft² |
What Each Unit Is
Square Feet (ft²) — the area of a square one foot on each side, or 0.092903 square metres. The imperial unit US and UK property is advertised in.
Acres (ac) — exactly 4,046.8564224 square metres, or one furlong by one chain. The area a yoke of oxen could plough in a day — long and thin, because turning wasted time.
A Sense of Scale
A bedroom is 120–200 ft²- A US home averages 2,300 ft²
- A parking space is 130 ft²
- An American football field is 1.32 acres
- A soccer pitch is about 1.8 acres
Precision
The factor 0.0000229568411387 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
In Code
`javascript
const squareFootToAcre = (value) => value * 0.0000229568411387;
``
Where This Conversion Comes Up
- Real estate
- Farming
- Construction
- Landscaping
- Flooring
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 ft² with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 ft² becomes | Error |
|---|---|---|---|
| 0 | 0 | 0 | 100.0000% |
| 1 | 0 | 0 | 100.0000% |
| 2 | 0 | 0 | 100.0000% |
| 3 | 0 | 0 | 100.0000% |
| 4 | 0 | 0 | 100.0000% |
The right number of significant figures is set by your input, not by the converter. If you measured square feet to three significant figures, the answer in acres is only good to three — writing more digits claims precision the measurement never had.