The koku was the standard unit of monetary measure in Rokugan. Its value was equal to the amount of rice that would feed a man for one year, roughly five bushels of rice. [1]

Worth of a Koku Edit

One Koku

One Koku

During the Dawn of the Empire heimin piled sacks of rice in a square at Otosan Uchi, and it was agreed about how many represented a koku. This arch, called Daikoku's Arch was built over the sacks, so that the measurement within would never be lost. [2]

Variable Worth Edit

The koku was based upon a year's harvest, so the value of items could fluctuate wildly from year to year, making it difficult to anticipate the cost of goods and services (other than rice) from year to year. [3]

Invention Edit

The coin used for the koku was invented and designed by Yasuki Tanaka in 243. The design of his coin featured the kanji of the Fortunes on one side and the Kami on the other. A hole ran through the center of the coin, which allowed for the coins to be strung for easy carrying and counting. The original design was still used to this date. Made of gold, it was simple and recognizable, but confounded most attempts at forgery. [4]

Koku is made round to go around.
-Oft-repeated Yasuki adage [5]

Implementation Edit

At first, the coin was used exclusively by the Crane Clan, but eventually the Emperor asked about the little copper coins. In response, Tanaka gave the Emperor the minting plates for the coins as a gift. [4]

Smaller Denominations Edit

One koku could be broken into five smaller silver coins known as ichibukin, or more commonly known as bu. A bu could be further broken down into ten copper coins known as zeni. [1]

Minting Edit



Each clan minted their own coinage, and used distinctive marks on them so the value of a Lion farm would not be confused with that of a Crane farm. The theory was that the coins could be redeemed for an amount of rice equal to their value at any time, although this practice was rarely enforced. The coins remained in circulation, and would be more commonly used as a medium of exchange. [1]


  1. 1.0 1.1 1.2 Legend of the Five Rings; Third Edition, p. 38
  2. Otosan Uchi:Book 1, p. 52
  3. Secrets of the Crane, p. 35
  4. 4.0 4.1 Legend of the Five Rings; Third Edition, pp. 11, 181
  5. Secrets of the Crab, p. 81

Sources Conflict
The sources relating to this article are in conflict with each other.
L5R Third Edition and Winter Court:Kyuden Asako page 26 claims Koku are copper coins, which iss considered a typo, or they were talking of the smaller zeni. Oni no Pikachu 09:17, May 16, 2012 (UTC)

Sources Conflict
The sources relating to this article are in conflict with each other.
"Roleplaying in the Emerald Empire page 29 states a bu was ten zeni, so a koku was 50 zeni. Oni no Pikachu 09:21, November 22, 2011 (UTC)

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