Japanese units of measurement for the property

畳 /jou/ means the size of the tatami, a traditional Japanese mat woven soft rush straw.
坪 just equals the area twice 間 /ken/, which equals 1 ⁹/₁₁ meters.
坪 /tsubo/ nearly equals 2 畳.
畳 equals ca 1.653 square meters.
坪 equals ca 3.306 square meters.

For example,
35 cm³ equals ca 21.17 畳, ca 10.59 坪.
50 cm³ equals ca 30.25 畳. ca 15.12 坪.
60 cm³ equals ca 36.3 畳, ca 18.15 坪.