Nouplo

Riichi mahjong score calculator

Han and fu in, the payment out.

Points
1,000
Limit
Output
1,000 points
Non-dealer ron: the player who dealt in pays 1,000.

Working (non-dealer ron, 1 han 30 fu)
  Base points = fu × 2^(han + 2) = 30 × 2^(1 + 2) = 30 × 8 = 240
  Non-dealer ron = base × 4 = 240 × 4 = 960 → rounded up to the next 100: 1,000

Counting fu (a guide)
  Base 20 fu
  Closed hand won by ron +10, any tsumo +2 (not pinfu tsumo)
  Triplets and quads  simples  terminals, honors
    open triplet            2                  4
    closed triplet          4                  8
    open quad               8                 16
    closed quad            16                 32
  Pair of dragons, seat or round wind +2 (some rules: 4 for a double wind)
  Kanchan, penchan or tanki wait +2 (ryanmen and shanpon 0)
  Round the total up to the next 10
  Seven pairs (chiitoitsu) 25 fu, pinfu tsumo 20 fu, an open pinfu-shaped ron 30 fu

Your files stay on your device

This tool runs entirely in your browser. What you paste is processed on your device and is never sent to a server, so it is safe to use with tokens, keys and unpublished text.

How it works

  1. Choose the han and the fu of the winning hand.
  2. Choose whether the winner is the dealer, and whether they won by ron or tsumo; add the honba counters.
  3. The payment appears first — who pays what — then the calculation and a guide to counting fu.

Frequently asked questions

How are riichi mahjong points calculated?
Base points = fu × 2^(han + 2). A non-dealer’s ron pays 4 times that, a dealer’s 6 times, each payment rounded up to the next 100. 4 han 30 fu: 30 × 64 = 1,920, × 4 = 7,680 → 7,700.
When is a hand a mangan?
When the base points reach 2,000: 5 han always, and 4 han with 40 fu or more, or 3 han with 70 fu or more. Then come haneman (6–7 han), baiman (8–10), sanbaiman (11–12) and yakuman.
How are fu counted?
20 for winning, +10 for a closed ron, +2 for a tsumo, then points for triplets and quads (more for terminals and honors, double if concealed), +2 for a dragon or own-wind pair or a single-wait, rounded up to the next 10. Seven pairs is always 25.
What does honba add?
300 points per counter to a ron, or 100 from each player on a tsumo.
Is anything uploaded?
No. It is worked out in your browser, and nothing you type leaves your computer.

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