Acre (AC) Conversions
The acre is a unit of land area used in the imperial and US customary systems. The acre is a statute measure in the United States, in the United Kingdom and in almost all countries of the former British Empire: in most it is lawful to "use for trade" if given as supplementary information and is not used for land registration.
In the United States both the international acre and the US survey acre are in use. While all modern variants of the acre contain 4,840 square yards, there are alternative definitions of a yard, so the exact size of an acre depends upon the particular yard on which it is based. As a unit of measure, an acre has no prescribed shape; any area of 43,560 square feet is an acre. The acre is commonly used in a number of current and former Commonwealth countries by custom, and in a few it continues as a statute measure.