Riichi Fu Count

Riichi Fu Count

Work top to bottom. Stop when you reach a result.

  1. ?

    Seven pairs (chiitoitsu)?

    Stop here. No rounding.

    Yes → 25 fu
    No
  2. ?

    Pinfu?

    Closed, all sequences, valueless pair, two-sided wait.

    Yes → tsumo 20 · ron 30
    No
  3. +

    Base

    Every other hand starts here.

    20
  4. ?

    Closed hand won on a discard (ron)?

    Yes +10
  5. ?

    Won by tsumo?

    Open or closed.

    Yes +2
  6. +

    Melds

    Add every triplet and kan. Sequences are 0.

    2triplet ×2if closed ×2if 1, 9 or honor ×4if kan

    Every meld lands on 2481632

    Apply every multiplier that fits: a closed kan of honors is 2 × 2 × 2 × 4 = 32.

    A triplet completed by the winning discard counts as open.

  7. +

    Pair

    Only a pair of yakuhai scores.

    Dragon pair2
    Round-wind pair2
    Seat-wind pair2
    Pair that is both round and seat wind4

    Some rule sets score the double-wind pair as 2.

  8. +

    Wait

    If the hand reads two ways, use the one that scores more.

    Kanchan closed wait, 4-6 on 52
    Penchan edge wait, 1-2 on 32
    Tanki single wait for the pair2
    Ryanmen two-sided wait0
    Shanpon two pairs, either completes0
  9. =

    Round up to the next 10

    38 becomes 40. 40 stays 40.

    fu
  10. ?

    Open hand that still totals 20?

    All sequences, valueless pair, won on a discard.

    Yes → 30 fu