1 sho at that time was converted into 0.4 sho with today's standard ("the numerical study of the economy under the civil administration in the Nara period," written by Goichi SAWADA, republished by Kashiwashobo Co., Ltd.).
当時使われていた尺度から現在の升量に換算すると、当時の1升は現升の0.4升に当たる（澤田吾一『奈良朝時代民政経済の数的研究』、復刻柏書房）。