Japan uses Metric System and More ...
8月
25日
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Tatami Mat
In addition to sum, Japan uses "TSUBO 坪" to show how large the space is. TSUBO is based on two Tatami Mat size. Two Tatami mats create a square space that is 3.3 square meters. That is 35.52 square feet.
You count each Tatami as one "jo 畳". So if the room has 6 Tatami, it is called 6 jo room. That will be 19.8 square meter or 213.13 square foot.
Now you know how Japanese explain the room size.
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