An Irish acre is a unit of area historically used in Ireland, Yorkshire, and regions bordering the Solway Firth.[1]
One Irish acre is equal to about 1.62 (196⁄121) acre, 7,840 square yards, or 70,560 square feet.
The difference between the Irish acre and the statute acre arises from the fact that the Irish mile is 14⁄11 miles (1.273 mi or ~ 2km). Whereas a one-acre area ten times as long as wide would have dimensions of 66 feet × 660 feet, the Irish acre of that shape would have dimensions of 84 feet × 840 feet.