how big is an acre in feet

An acre is 43,560 square feet in size. This size comes from the traditional definition of an acre, which is a parcel of land measuring one furlong (660 feet) by one chain (66 feet), totaling 43,560 square feet. An acre can take any shape, as long as its total area equals 43,560 square feet. For reference, an acre is roughly the size of a football field without the end zones.