How much liquid does one koku equal?

One koku is traditionally defined as the volume of sake that is equivalent to 180 liters, which was established during the Edo period in Japan as a measurement for rice and sake. This volume has significant historical relevance, as it was used to denote the amount of rice necessary to feed one person for a year, emphasizing the cultural importance of rice in Japanese society.

In the context of sake production and distribution, understanding the koku is critical for professionals in the field, as it helps in measuring production scale and managing inventory. Thus, choosing 180 liters accurately reflects this traditional measure and its significance within the sake industry.