Several records have descriptions of the volume, such as, with today's standard, 0.6270 sho (in "Irohajirui-sho" [a dictionary written by Tadakane TACHIBANA in the Heian period]), 0.8223 sho (in "the endorsement of a request about a fief of Moriyoshi AZUMA"), and 0.4932 sho (in "Junhai" [a document in Kamakura period]) (according to "the study of the history of quantitative system in Japanese medieval age," written by Keigo HOGETSU, published by Yoshikawa Kobunkan Inc. in 1961).
文献的には現升の0.6270（『伊呂波字類抄』）、0.8223（『東盛義所領注文案裏書』）、0.4932（『潤背』）とする記録が残されている（寶月圭吾『中世量制史の研究』、昭和36年、吉川弘文館）。