In Japan, the size of a room is often measured by the number of tatami mats (-畳 -jō). Alternatively, house floor area is measured in terms of tsubo, where one tsubo is the area of two tatami mats (a square). One tsubo is almost the area of 2 blocks of the standard tatami put together into a square since the Edo Period (江戸時代).
In South Korea, a new law enacted as of July 1, 2007, will replace the use of pyeong in official documents with the square metre. A studio apartment will generally be around 8 to 12 pyeong, a house somewhere around 25 or more, and the smallest of rooms, consisting of only a bed and a bit of floor space for students, will be as little as 1.5 pyeong.