How Hong Kong mahjong scoring works
Hong Kong (Cantonese) mahjong is played by four. The most common house rules are a 3-fan minimum, a 10-fan cap, half doubling, and the discarder covers the whole win. After a win you count the fan, then convert fan to points. The table shows what each player loses on a self-draw (before base points):
| Fan | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
|---|---|---|---|---|---|---|---|---|
| Half doubling (bun laat) | 4 | 8 | 12 | 16 | 24 | 32 | 48 | 64 |
| Full doubling (laat laat) | 4 | 8 | 16 | 32 | 64 | 128 | 256 | 512 |
Half doubling doubles every two fan after 4, with the fan in between at ×1.5. Full doubling doubles with every fan after 4.
- Self-draw: each of the three others loses the table value. A 5-fan self-draw with half doubling: −12 each, the winner +36.
- Win off a discard, discarder only (default): only the discarder loses, twice the table value. 5 fan: discarder −24, winner +24.
- Shared discard (option): the discarder loses 1×, the other two 0.5× each.
- Liability: the liable player alone covers the whole win.
- Draw: no points for that hand.
Keep score in three steps
- Choose Hong Kong mahjong, enter the four players in East, South, West, North order, pick the first dealer and the base points.
- After each hand, record the win: who won, self-draw or discard, who discarded, and the fan on the number pad (fan below the minimum is greyed out). Draws and false wins can be recorded too.
- Check each player's +/− and save. Dealer repeats and the prevailing wind move on automatically. At the end, make a share image for the group.
House rules you can change before you start
- Minimum fan, cap (for example 8, 10 or 13), half or full doubling, or edit the whole fan table.
- Discarder only or shared, how many times the discarder loses, dealer doubles, whether the dealer stays after a draw.
- Multiple winners on one discard, false win penalty, and a win off a kong replacement after an exposed kong (the player who discarded the kong tile covers it).
Rules lock when the session starts. Edit, delete or undo any hand and the dealer and winds are recalculated.