The size of each sheet of paper is determined by the dimensions of the su (bamboo screen) used in papermaking.
Since these screens were originally designed differently in each production area, there is no fixed standard, and the sizes may vary slightly. In addition, the original measurements were based on the traditional Japanese unit shaku, which has been converted into centimeters. Depending on whether 1 shaku is calculated as 3.03 cm or approximately 3 cm, the resulting size can differ.
Therefore, the sizes shown here are approximate.