Before explaining how to calculate fu, let's explain how fu is organized.

Fu always starts with "fuutei". If you agari via menzen ron, add "menzen kafu". Add fu if via tsumo. Add fu for the configuration of the mentsu. Add fu for the configuration of the jyantou. And finally, add fu for the type of wait. With all of these figured out, you can get the total fu.

By the way, for the yaku known as chiitoitsu, the makeup of your hand the type of wait don't matter; it's always considered 25 fu.

Formulae for calculating fu

Formulae for calculating fu

For menzen ron Fuutei (20) + menzen kafu (10) + mentsu fu (x) + jyantou fu (y) + wait fu (z)

For ron with fuuro Fuutei (20) + mentsu fu (x) + jyantou fu (y) + wait fu (z)

For menzen tsumo Fuutei (20) + tsumo fu (2) + mentsu fu (x) + jyantou fu (y) + wait fu (z) This formula is actually for tsumo whether or not it's menzen

The chart to the left shows the fu values of mentsu. Minkoutsu is a koutsu made by calling and minkantsu is a kantsu made by calling. The fu values for yaochuupai (1, 9, and jihai) are exactly twice those of the chunchanpai (2-8), so you really just need to remember one or the other.

If you agari via ron with a shanpon wait, that koutsu is treated as a minkoutsu!

If you agari via ron with a shanpon wait, that koutsu is treated as a minkoutsu!

Minkoutsu Ankoutsu Minkantsu Ankantsu

Minkoutsu Ankoutsu Minkantsu Ankantsu

For the jyantou, it's like this. Jikaze is "ton" for toncha, "nan" for nancha, "shaa" for shaacha, and "pei" for peicha. Bakaze/bafuu is "ton" during tonba and "nan" during nanba. Sangenpai refers to "haku", "hatsu", and "chun". Renfonpai is when jikaze and bakaze overlap.

For the jyantou, it's like this. Jikaze is "ton" for toncha, "nan" for nancha, "shaa" for shaacha, and "pei" for peicha. Bakaze/bafuu is "ton" during tonba and "nan" during nanba. Sangenpai refers to "haku", "hatsu", and "chun". Renfonpai is when jikaze and bakaze overlap.

Other

Of course, in the case of renfonpai, you don't also add the fu values for jikaze and bakaze. In short, the jyantou is worth at most 4 fu.

Finally, here's an overview of the waits. In the case of multiple waits, the form of the wait you used to agari takes precedence. The calculation of fu is rounded up at the end, so it will always be a multiple of 10.

In the case of these waits

If you agari with one of these, it's ryanmen, 0 fu.

If you agari with one of these, it's tanki, 2 fu.

However, if the yaku total at least 5 han or you got yakuman, the points are fixed without regard to fu so there's no need to calculate them. Hey, why are you doing a closeup of my chest?

Oya Point Chart 2

13 han or more Kazoe yakuman (counted yakuman), Yakuman

13 han or more Kazoe yakuman (counted yakuman), Yakuman

Ko Point Chart 2

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