Riichi mahjong calculators
Everything on this page is computed in your browser. No sign-up, no network request, no upload — you can open it offline once the page has loaded.
Points calculator
Pick han, fu, dealer or non-dealer, and ron or tsumo. Tsumo results are broken down into what the dealer pays and what each non-dealer pays, so you can call the score out loud at the table.
Choose the conditions above and the payment appears here.
Points lookup table
In each cell the top number is ron and the smaller bottom number is the tsumo total. The table is generated from the same engine as the calculator above, so the two can never drift apart.
Mangan and above (fixed by han, fu is irrelevant)
Hand analyzer (Chinese interface)
The tenpai and tile-efficiency analyzer is on the Chinese page. The input
notation is the standard one — 123m 456p 789s 11z for 万 / 筒 / 索 / honours —
and the output is numbers plus tile names, so it stays usable without reading Chinese.
Which rules do these use?
- Riichi, East-round rules: ippatsu on, ura dora on, three red fives, double-wind 4 fu, open tanyao allowed, counted yakuman at 8000.
- Mangan is triggered by the standard rule: base points ≥ 2000, i.e. 3 han 70 fu / 4 han 40 fu / 5 han. Kiriage mangan is not applied.
- This is the same engine the Chinese course, the trainers and the full game use, and it is covered by a regression test suite.