1 Acre = 43 560 Square Feet
There are 43560 square feet in an acre, because an acre is defined as an area of 1 chain by 1 furlong (66 feet * 660 feet), that makes 66 ft * 660 ft = 43560 sq. feet in an acre.
For example, to find out how many sq. feet there are in an acre and a half of a land, multiply the acre value by the conversion factor, that makes 1.5 * 43560 = 65340 square feet in 1.5 acres.
Acre is an imperial and US customary area unit and equals to 43560 sq. feet, 4840 sq. yards and 4046.86 sq. meters. The abbreviation is "ac".
An acre is about 40% of a hectare (1 acre is 0.404686 hectare). To compare how big an acre is, it is about 1.35 NFL football field, 2.5 soccer field (393 ft * 295 ft maximum size as regulation) or roughly 16 tennis courts (78 ft * 36 ft).
Square foot is an imperial and US customary area unit and defined as a square with all sides are one foot in length. 1 square foot equals to 144 sq. inches and 0.093 sq. meters. The abbreviation is "ft^{2}".