Square Feet to Acres
The square foot is used throughout the US and UK to describe the floor area of homes and offices. An acre is 4,840 square yards, roughly the size of a football field, the traditional unit for land area in the US and UK. 1 ft² equals ≈0.0000229568 ac, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to area, measured here against area's base unit (m²) — every other area unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
ac = ft² × ≈0.0000229568
ft² = ac × 43,560
Worked example: 5 ft² × ≈0.0000229568 = ≈0.000114784 ac.
Conversion table
| Square Foot (ft²) | Acre (ac) |
|---|---|
| 1 ft² | ≈0.0000229568 ac |
| 2 ft² | ≈0.0000459137 ac |
| 3 ft² | ≈0.0000688705 ac |
| 5 ft² | ≈0.000114784 ac |
| 10 ft² | ≈0.000229568 ac |
| 20 ft² | ≈0.000459137 ac |
| 25 ft² | ≈0.000573921 ac |
| 50 ft² | ≈0.00114784 ac |
| 100 ft² | ≈0.00229568 ac |
| 250 ft² | ≈0.00573921 ac |
| 500 ft² | ≈0.0114784 ac |
| 1,000 ft² | ≈0.0229568 ac |
Frequently asked
- How many Acres in a square foot?
- 1 ft² equals ≈0.0000229568 ac.
- How do I convert Square Feet to Acres?
- Multiply the value in ft² by ≈0.0000229568 to get ac. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Square Foot and Acre are both defined by a fixed conversion factor to area's base unit (m²), so the result shown is exact to the precision displayed, not an approximation.