Han measure the value of an ordinary hand. Each ordinary yaku has a fixed han value, then dora and uradora add one han per matching tile. Aka-dora do the same in variants that enable them; WRC 2025 uses none. Genuine yakuman follow a fixed payout and ignore dora.
Scores are read from the han and fu of the hand at the end of a ron or tsumo. From one to four han the payout is computed from a base-points formula in which each added han roughly doubles the value, until it reaches the mangan ceiling. Some yaku lose one han when the hand is open (kuisagari): sanshoku and ittsuu drop from two to one, honitsu from three to two, chinitsu from six to five.
Beyond the doubling scale, fixed limit hands are defined by han count: five han is mangan, six to seven haneman, eight to ten baiman, and eleven to twelve sanbaiman. Under Tenhou rules, thirteen or more han is kazoe yakuman. WRC 2025 calls that tier yonbaiman, with the same payout as one yakuman without making it a genuine yakuman. Dora add han but can never make a yakuless hand legal.