square feet to acres
This converter makes instant conversions from square feet (ft²) to acres (ac). It also provides the conversion steps. To use the converter, please provide a value in the input field. The converter will begin making conversions as the values are being typed in.
How many acres in a square foot?
Both acre and square foot are units of area in the United States (US) customary systems of measurement as well as in the British imperial system. In both systems, an acre is defined to be of a square mile. A mile is defined to have 5280 feet. Therefore, there are 5280 × 5280 = 27,878,400 square feet in a square mile. of which is = 43,560 square feet. Therefore, there are 43,560 square feet in an acre. Based on this, there are ≈ 0.00002295684 acres in a square foot.
How to convert square feet to acres
Based on the definition of 1 acre being exactly 43560 square feet, the square foot to acre conversion formula is:
ac = 

Thus, to convert from square feet to acres, divide a value in square feet by 43560. For example, convert a campus of 1000000 square feet to acres:
1000000 ft² = 

ac = 22.957 ac 