An informal unit of area used in Japan to measure the size of rooms in houses and apartments. One jo is the area of a traditional tatami mat, 180 x 90 centimeters or 1.62 square meters (1.94 square yards).
An informal unit of area used in Japan to measure the size of rooms in houses and apartments. One jo is the area of a traditional tatami mat, 180 x 90 centimeters or 1.62 square meters (1.94 square yards).