Definitions An Acre is a US customary and an imperial (UK) unit of area measurement and is abbreviated as "ac". One Acre is equal to 43560 square feet, 4840 square yards, or 4046.8564 square meters. An acre is about 40% of a hectare (1 acre equals 0.404686 hectares).

1 Acre is equal to 4840 square yards, 43,560 square feet, or 0.404 hectares. An acre can be any dimensions providing they equal 43,560 square feet. For example, 66 feet x 660 feet equals 43,560 square feet or 1 acre. #1. American Football Field The size of a football field including the end zones is 360 feet long x 160 feet wide.