Riichi Mahjong Score Calculator

Why Han and Fu Matter

This calculator covers Japanese Riichi mahjong scoring specifically — not American/NMJL mahjong (which uses a card reissued every year with entirely different hand values) and not Chinese Official scoring (which uses its own fan system). If you already know your hand's han and fu, the actual points you score aren't obvious from those two numbers alone — the conversion involves an exponential base-points formula, then different multipliers depending on whether you won by self-draw or off a discard, and whether you're the dealer. Two hands with the same han and fu can pay out very differently just based on who's dealing and how the win happened, which is exactly what trips up newer players doing the math at the table.

What You Need Before You Start

You need your hand's han count — the sum of every yaku (scoring condition) your hand qualifies for, plus any dora — and its fu count, a separate score built from the shape of your hand and how you completed it (these are worked out from the tiles themselves, which this tool doesn't do). You also need to know your seat (dealer or non-dealer) and whether you won by tsumo (drawing the winning tile yourself, so every other player pays) or ron (winning off someone else's discard, so only that player pays). Fu stops mattering once han reaches 5, because mangan and every tier above it uses a fixed point value regardless of fu — the calculator ignores whatever fu you've selected once you're in that range.

The Logic Behind the Scoring

Below 5 han, base points are fu × 2^(2+han), capped at 2,000 — if that formula would produce 2,000 or more (which happens with high fu at 3 or 4 han), the hand is automatically scored as mangan instead. At 5 han the base is fixed at 2,000 (mangan); 6–7 han is 3,000 (haneman); 8–10 han is 4,000 (baiman); 11–12 han is 6,000 (sanbaiman); 13+ han is 8,000 (yakuman). From that base, a non-dealer ron pays base × 4, a dealer ron pays base × 6, each non-dealer pays base × 1 on a non-dealer's tsumo (with the dealer paying base × 2), and every player pays base × 2 on a dealer's tsumo. Every individual payment is then rounded up to the nearest 100 points.

Notes & Caveats

This tool does not work out han or fu from your tiles — it only converts numbers you've already determined into a point total, and it uses standard base scoring without optional house rules some groups play with (like rounding 4 han 30 fu up to a full mangan). Kuitan, red fives, and other rule variants affect which yaku and dora apply, not the conversion math shown here. If your local rules differ from the standard tables, treat this as a reference starting point rather than a house-rule-specific scorer.