Square Foot to Acre
Free instant square foot to acre converter. 1 ft² = 2.2957e-5 ac.
Common Square Foot to Acre values
| Square Foot (ft²) | Acre (ac) |
|---|---|
| 1 | 2.2957e-5 |
| 5 | 0.000114784 |
| 10 | 0.000229568 |
| 25 | 0.000573921 |
| 50 | 0.00114784 |
| 100 | 0.00229568 |
| 500 | 0.0114784 |
| 1000 | 0.0229568 |
How does Square Foot to Acre conversion work?
Type a value in the Square Foot (ft²) field and the equivalent in Acre (ac) appears instantly to the right. The math uses the exact formula shown above — no rounding errors, no approximations beyond standard floating-point precision. Use the swap button to flip the units and see the inverse conversion.
Square Foot. The standard floor-area unit in the US. About a quarter of a square metre.
Acre. The traditional land-area unit in the US, UK, and many former British colonies. About 4,047 square metres.
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🎯 Accurate conversions
Conversion factors come from the official standard (NIST, BIPM, ISO definitions where applicable). Values are precise to standard floating-point limits.
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