Unit Definition (perch) The perch is a unit of area. A perch of area covers exactly 272.25 square feet or about 25.292 85 square meters. There are 40 perches in a rood and 160 perches in an acre.
Unit Definition (square yard) The square yard is a traditional unit of area. 1 yd2 equals 9 ft2, 1296 in2, or exactly 0.836 127 36 m2.
