Shaku (roughly 1 ft.) = 11.93 in.
Ri are converted into miles by being multiplied by 2.44.
SQUARE
Ri (roughly 6 sq. miles) = 5.955 sq. miles.
Chō (sometimes written, Chōbu) (roughly 2½ acres) = 2.450 acres = 10 tan = 3,000 tsubo.
Tan or Tambu (roughly ¼ acre) = 0.245 acres = 10 se = 300 bu.
Bu or Tsubo (roughly 4 sq. yds.) = 3.953 sq. yds.
An acre is about 4 tan 10 bu or 1,200 bu or tsubo (an urban measure). The size of rooms is reckoned by the number of mats, which are ordinarily 6 shaku in length and 3 shaku in breadth.
CAPACITY
Koku (roughly 40 gals. or 5 bush.) = 39.703 gals, or 4.960 bush. = 10 tō. According to American measurements, there are 47.653 gals, (liquid) and 5.119 bush, (dry) in a koku. A koku of rice is 313½ lbs. (British).