Points

From faan to points

Faan don't add up to points directly. Each faan roughly doubles the value of the hand, so a ten-faan hand is worth far more than three three-faan hands. Two scales are common:

Half-spicy (半辣, bun3 laat6): points double with every faan up to 4, then with every two faan, with a step of half again in between. This is the usual Hong Kong scale and the calculator's default.
Full-spicy (全辣, cyun4 laat6): points double with every faan all the way up.

Faan	Half-spicy	Full-spicy
0	1	1
1	2	2
2	4	4
3	8	8
4	16	16
5	24	32
6	32	64
7	48	128
8	64	256
9	96	512
10	128	1024
11	192	2048
12	256	4096
13	384	8192

At a three-faan table, the rows below 3 never come up. Above the limit, the hand is scored at the limit.

Settling the points

The figure in the table is what the winner scores from a discard. Who gives up those points depends on how the hand was won:

Self-drawn (自摸): each of the other three players gives half, so the winner scores one and a half times the table value.
Discarder gives all (全銃): the player who discarded the winning tile gives the whole amount. The other two lose nothing.
Discarder gives half (半銃): the discarder gives half and the other two a quarter each.

Faan	From a discard	Self-drawn, each	半銃: discarder / others
3	8	4	4 / 2
4	16	8	8 / 4
5	24	12	12 / 6
6	32	16	16 / 8
7	48	24	24 / 12
8	64	32	32 / 16
9	96	48	48 / 24
10	128	64	64 / 32

All figures are half-spicy points.

Some tables have every player give the full table value on a self-draw instead of half, and some count the dealer's wins and losses double. If yours does, multiply accordingly. See house rules.