Convert from tatami to stang

Unit Definition (tatami)
The tatami is a Japanese unit of area equal to the area of a traditional tatami mat, 0.5 ken by 1 ken or about 90 centimeters by 180 centimeters (roughly 1.62 square meters or 17.5 square feet). This unit, used especially for measuring the area of rooms in houses and apartments, is also called the jo.

Unit Definition (stang)
The stang is a traditional Welsh unit of land area generally equal to 3240 square yards, 0.6694 acre, or 0.2709 hectare.