Ichikoku (one koku, a traditional unit of volume)

Ichikoku (一石) is a unit used to measure the volume of sake, equal to approximately 180 liters. It has long been used in Japan to measure traditional quantities of rice and sake. One koku is also equal to 10 to (斗, a traditional unit of volume). In sake brewing and distribution, the koku is often used, and it is an important benchmark in the sake industry.