Kokaho (price regulation law) is a law that stipulated the official prices and the conversion rates for goods at the market from ancient times to medieval periods under the Court, kokuga (provincial government offices) and the Kamakura bakufu (Japanese feudal government headed by a shogun).
估価法（こかほう・沽価法）とは、古代から中世にかけての日本において、朝廷・国衙・鎌倉幕府において、市場における公定価格及び物品の換算率を定めた法律。