The size of a chigyo area, called chigyo-daka, was used as the standard of the amount of military service a lord levied on his samurai, and a chigyo-daka was expressed by kandaka (the money corresponding to the amount of rice production based on the size of the chigyo area chigyo) during the Sengoku Period.
知行面積＝知行高は、主君が武士に賦課する軍役の基準となり、その知行高の算出は、戦国期においては貫高により表された。