Riichi (Japanese) mahjong. Facts only — no advice.
Quickly answer "how many points is 3 han 30 fu?" Pick the han and fu, choose dealer or non-dealer and ron or tsumo, and the calculator shows the total points moved and the payment breakdown (from the discarder, or for tsumo the amount each non-dealer and the dealer pays, including "X all" for a dealer tsumo). The base value is fu × 2^(2+han); above the mangan cap it shows the limit hands by han — mangan (5 han), haneman (6-7), baiman (8-10), sanbaiman (11-12) and yakuman (13+). Switch to "Score table" mode for the full han × fu tables (non-dealer ron, non-dealer tsumo, dealer ron, dealer tsumo) plus a limit-hand summary, which you can print or save as PDF to keep beside the table. This is facts-only scoring for riichi (Japanese) mahjong, done entirely in your browser; your inputs are never stored or uploaded.
How to use
- In "Calculate" mode, pick the han and fu, then toggle dealer/non-dealer and ron/tsumo.
- Read the total points and the payment breakdown (from discarder / each non-dealer and dealer / X all). Limit hands show their name.
- Switch to "Score table" mode for the han × fu tables, then use the print button to save as PDF or print.
FAQ
How is the score calculated?
The base value is fu × 2^(2+han). A dealer ron pays base × 6, a non-dealer ron base × 4, a dealer tsumo base × 2 from each player, and a non-dealer tsumo base × 1 from each non-dealer and base × 2 from the dealer — each rounded up to the nearest 100. This is standard riichi (Japanese) mahjong scoring.
How are mangan, haneman, baiman and yakuman decided?
When the base value exceeds 2000 it is capped at mangan, and by han the hand becomes mangan (5 han, base 2000), haneman (6-7, 3000), baiman (8-10, 4000), sanbaiman (11-12, 6000) or yakuman (13+, 8000). Hands like 4 han 30 fu or 3 han 60 fu stay below mangan (7,700 / 11,600).
How do I enter the fu?
Choose 20, 25, 30, 40 and so on. Pinfu tsumo is 20 fu, seven pairs (chiitoitsu) is 25 fu; otherwise add the melds, wait and win bonuses to the 20 base fu and round up. This tool does not compute the fu itself — enter the final fu to get the score.
Can I print the score table?
Yes — the print button in "Score table" mode prints (or saves as PDF) the non-dealer ron, non-dealer tsumo, dealer ron and dealer tsumo han × fu tables plus the limit-hand summary, ready to keep beside the table.
Are my inputs uploaded?
No. Everything runs in your browser and nothing is sent to a server. Your han/fu and other settings are saved only on your device to make the next visit easier, and Reset clears them.