Unit Definition (ngarn) The ngarn is a unit of land area in Thailand. The ngarn equals 1/4 rai, 100 talangwah (tw), or exactly 400 square meters (478.396 square yards or just under 0.1 acre).
Unit Definition (square inch) The square inch is a traditional unit of area. 1 in2 equals exactly 6.4516 cm2 or 645.16 mm2.
