1 Square Foot = 0.0000229568411 Acre
Square foot is an imperial, US customary unit. It is used mostly in real estate, architecture and interior space plans. The abbreviations are "sq ft" and "ft2".
Acre is used in different systems as a unit of area. The international and survey acres are the mostly used ones but the difference between them is very small which is 0.016 sq. meters. It’s mostly used to measure the land. It is about 40% of hectare. The abbreviation is "ac".