Scoring your Mahjong Hand, Singapore-Style

First, add up all your base points. Multiply this by 4 and round up to the next multiple of 10. Winner applies 50 more points. Then apply your doubles (Fans). Fans are exponential, so a score of 60 with 3 fans is 60 * 2 * 2 * 2 = 480. Kongs are paid 300 points at the moment they occur. Also, if a player draws the Cat and the Mouse animal tiles, or the Rooster and Caterpillar animal tiles, those pay 300 on the spot as well. Flower tiles can be Konged when you have all four Flowers with the same number. The Dealer (East Wind) always wins and loses double, that is, if the dealer has money coming, he/she gets twice as much. Conversely, every point owed must be payed double. Don't lose to a big hand if you're dealer, and don't lose to the dealer when he/she has a big hand!

Base Points

Meld	Revealed	Concealed
Chi (sequence)	No points	No points
Mid-card Pong (2-8 any suit)	1/2 point	1 point
Mid-card Kong* (2-8 any suit)	2 points
End-card Pong (1 or 9 any suit)	1 point	2 points
End-card Kong* (1 or 9 any suit)	4 points
Wind Pong (any wind)	1 point	2 points
Wind Kong* (any wind)	4 points
Dragon Pong (any dragon)	1 point	2 points
Dragon Kong* (any dragon)	4 points
Any Flower or Animal	1 point
The Pair** (winner only)	1/2 point

* Kong pays 300 points (600 from or to the banker) at the moment it is declared. If the Kong is made by drawing the 4th tile from the wall into a concealed Pong, it is Am-Kong and pays 600 all around. All Kongs must be natural, that is, with no wild cards.

** The pair is only counted for the winner and only if the tiles are such that, had they been a Pong, they would have scored a double. That means the pair counts as a half point if it is a dragon, the prevailing wind, or the winner's relative wind.

Fans (Doubles)

Every meld or tile from this list adds another Fan to your score!

Dragon Pong/Kong
Prevailing or Relative Wind Pong/Kong
Animal Tile (Cat, Mouse, Rooster, Caterpillar)
Positional Flower Tile (if you're sitting South Wind and get a 2-Flower, that's a fan)
All Four Flowers in a Flower suit (1,2,3,4 of Seasons, e.g.)
All suited tiles are in the same suit

Special Hands

Pong-Pong (all 4 sets are pongs) -- 2 Fan
Peng-Hu (all 4 sets are chis, no honor tiles)*** -- 3 Fan
Chi-Mon (winning tile drawn from wall) -- Everyone pays dealer price
Fa-Seon (winning tile drawn from flower pile) -- 1 Fan and Everyone pays dealer price
Heavenly Twins (7 pairs) -- 3 Fan (all but the last tile must be drawn from the wall -- no discards)
Thirteen Wonders (1 & 9 Bamboo, 1 & 9 Ball, 1 & 9 Character, Each Dragon, Each Wind, and a pair -- Moon Game (take the whole pot -- everyone must buy in again)

*** To win Peng-Hu, which is all about having the crappiest luck of all, the winning tile must not have been unique. That means there must be more than one kind of tile that would complete a ready (calling) hand. If you're waiting specifically to complete your pair or a chi bounded by an end-card (1 or 9), you can't win Peng-Hu. You can win, you just don't get any Fans. For instance, this hand cannot claim Peng-Hu:

Only a 3 Character can complete this hand, so it can't be Peng-Hu.

Example Hand

Pair of dragons -- 1/2 point (winner only)
Pong of 5-Ball, concealed -- 1 point
Chi of Characters -- no points
Pong of Pak, the relative wind, revealed, 1 point
Kong of Sai, the prevailing wind -- 4 points
No flowers

6 1/2 times 4 is 26, which rounds up to 30. Plus 50 for winning is 80. The Pong of the North Wind, being the player's relative wind, is 1 fan, brining the score to 160. The Kong of Sai, the prevailing wind, is another fan, bringing the score to 320.