A koku of brown rice (unpolished rice) weighs about 150 กิโลกรัม (330 ปอนด์).[6][5] White rice (milled rice, polished rice) weighs about the same (150g per 1 gō).[7] But 1 koku of brown rice would only 0.91 koku of milled rice (white rice)[6] after processing (ญี่ปุ่น: 精米; โรมาจิ: seimai), i.e., removing the rice bran).
Apparently 1.8 koku (1 koku and 8 to) was actually required for nourishment by a man each year, according to the conventional wisdom documented in a "home code" (kakun [ja]) of a certain merchant family in the Edo Period.[8]
