The 30-second answer
In Taiwanese mahjong you build your own hand. In American mahjong you can only build hands printed on this year's card.
- 152 vs 144 tiles — American adds 8 jokers; Taiwan has none.
- 13 vs 16 tiles in hand — American wins on 14, Taiwan on 17.
- No chow in American mahjong — pung, kong, or win, nothing else.
- The Charleston — a tile-passing ritual with no Taiwanese equivalent.
- The rules change annually — NMJL issues a new card every spring.
If you have played one and are looking at the other for the first time, the tiles will fool you. Bams, craks, dots, winds, dragons — they are all there in both games. But the rules diverge so early and so hard that a lifelong Taiwanese player would be lost at an American table within about three minutes, and vice versa.
Here is exactly where they split.
1. All 8 differences in one table
| 🇺🇸 American (NMJL) | 🇹🇼 Taiwanese 16-tile | Notes | |
|---|---|---|---|
| Total tiles | 152 (144 + 8 jokers) | 144 (136 + 8 flowers) | The 8 extra tiles are the jokers |
| Jokers | 8, wild | None | The single biggest change in feel |
| Hand size | 13 tiles (14 to win) | 16 tiles (17 to win) | Dealer starts with 14 in both |
| What counts as a winning hand | Only hands printed on this year’s NMJL card | Any 5 sets + 1 pair you can build | This is the fundamental split |
| How often the rules change | New card every spring | Essentially unchanged for decades | Americans relearn annually |
| Can you chow (take a run)? | No — pung, kong, or win only | Yes, from the player to your left | Completely different rhythm |
| Start of play | The Charleston (ritual tile passing) | Replace flowers, then just play | Taiwan has no equivalent |
| Scoring | Value printed next to the hand on the card | Base + tai × tai count, added up by hand | Taiwan makes you do the math |
2. The card: why American mahjong changes every year
If you remember one thing from this page, make it this: in American mahjong you do not decide what a winning hand looks like.
The National Mah Jongg League (founded 1937) publishes a card every spring listing every legal winning hand for that year, along with what each one is worth. A combination that is not on the card is not a win, no matter how elegant it looks.
Taiwanese mahjong has nothing like this. The winning shape is structural — five sets plus one pair — and every famous hand type is just a variation built inside that structure. You are free to chase whatever you can assemble.
And because the American card is reissued annually, players there genuinely relearn the game every spring. It also explains a search pattern you can watch in the data: interest in "american mahjong" climbs sharply every April through June, right when the new card lands and everyone is working out what they can build this year.
A note on the card: it is NMJL's copyrighted work. Get it through official channels — we do not reproduce its contents here.
3. Jokers: the 8 tiles Taiwan doesn't have
Of American mahjong's 152 tiles, 8 are jokers. Taiwanese sets have none.
What a joker can do: stand in for any tile inside a group of three or more identical tiles — a pung, a kong, even a quint.
What it cannot do: be used in a pair, or stand alone as a single tile.
That pair restriction is where beginners get stuck. You can be sitting on two jokers and still be frozen waiting for one specific tile to finish your pair. Nothing in Taiwanese mahjong feels like this, because every tile you hold is a real tile you actually drew.
4. 13 tiles vs 16 tiles
| In hand | To win | Structure | |
|---|---|---|---|
| 🇺🇸 American | 13 | 14 | Must match a hand on the card |
| 🇹🇼 Taiwanese | 16 | 17 | 5 sets + 1 pair, freely built |
Taiwanese 16-tile is the largest hand in any major mahjong variant. Three extra tiles sounds small; in practice it makes every turn a harder decision and makes reading what you are waiting on genuinely difficult.
American hands are smaller and constrained by the card, so the real decision is not "what should I build" but "which card hand am I chasing, and when do I abandon it for a different one".
5. Why you can't chow in American mahjong
In Taiwanese mahjong you can chow — claim the discard from the player on your left to complete a run. American mahjong has no chow at all.
A discard in American mahjong can only be claimed for:
① a pung — three of a kind
② a kong — four of a kind
③ the win itself — if it completes your hand
Take away the chow and the whole rhythm changes. You get far fewer chances to react to other people's discards, and runs have to be drawn tile by tile.
6. The Charleston
The most distinctly American part of the game, and the one with no Taiwanese counterpart whatsoever. Before play begins:
First Charleston (required): pass three unwanted tiles right, then across, then left.
Second Charleston (optional, table must agree): the same thing in reverse — left, across, right.
Finally: an optional courtesy pass of one to three tiles with the player across from you.
The purpose is practical — dump your junk, move toward a hand on the card — but it is also the most social stretch of the game. You are talking while you pass, and quietly noting what everyone is throwing away.
Taiwanese mahjong simply deals and starts. A bad opening hand is your problem.
7. Scoring: the card vs tai counting
| How it works | |
|---|---|
| 🇺🇸 American | Every hand on the card has a value printed beside it. You win that hand, you score that number. No arithmetic. |
| 🇹🇼 Taiwanese | Base + tai × tai count, and you count the tai yourself: concealed hand 1 tai, all-pungs 4 tai, single-suit 8 tai, and so on. Self-draw is paid by all three opponents; winning on a discard is paid by the discarder alone. |
Tai counting is a real skill in Taiwan — miscount and you are paid the wrong amount. American mahjong outsources that entirely to the card.
8. Which one should you learn?
Learn what the people near you play. You cannot mix the two at one table, so this is the only answer that matters in practice.
In the US? It will almost certainly be American mahjong, and you will need the current card.
Want maximum freedom in hand building? Taiwanese 16-tile: the biggest hand in mahjong, no card dictating what is allowed, and scoring you control yourself.
We build free browser tools for Taiwanese 16-tile mahjong — no signup, no download, no ads. The pung, chow and kong trainer is the fastest way to get the basic calls into muscle memory, and it works for Chinese-style mahjong generally, not just the Taiwanese variant.
FAQ
What is the single biggest difference between American and Taiwanese mahjong?
In American mahjong you do not invent your own hand. Every legal winning hand is printed on a card issued each year by the National Mah Jongg League (NMJL), and anything not on that card is not a win — even if it looks like a perfectly good mahjong hand. Taiwanese mahjong has no card: any five sets plus a pair wins, and that structure has stayed the same for decades.
How many tiles does each game use?
American mahjong uses 152 tiles: 144 standard tiles (36 bams, 36 craks, 36 dots, 16 winds, 12 dragons, 8 flowers) plus 8 jokers. Taiwanese mahjong uses 144: the standard 136 plus 8 flowers, and no jokers at all.
How big is the hand in each game?
American mahjong deals 13 tiles (the dealer gets 14) and you win with 14. Taiwanese mahjong deals 16 and you win with 17 — the largest hand of any major mahjong variant. That is three extra tiles to manage every single turn, which is why Taiwanese hands take longer and branch more.
Can you chow in American mahjong?
No. American mahjong has no chow. A discarded tile can only be claimed for a pung (three of a kind), a kong (four of a kind), or to complete your winning hand. In Taiwanese mahjong you can chow a run from the player to your left, which gives you far more chances to react to what other people throw.
What is the Charleston?
A tile-passing ritual at the start of an American mahjong game, with no equivalent in Taiwanese play. Each player picks three unwanted tiles and passes them right, then across, then left. An optional second Charleston runs in reverse, and there is often a final courtesy pass with the player across from you. The point is to dump junk and move toward a hand on the card.
How do jokers work?
A joker can stand in for any tile inside a group of three or more identical tiles — a pung, a kong, even a quint. It cannot be used in a pair, and it cannot stand alone as a single. That restriction traps a lot of beginners: you can be holding two jokers and still be stuck waiting on one specific tile for your pair.
Which one should I learn?
Learn whichever one the people around you play, because you cannot mix them at one table. If you want the version with the most hand-building freedom, Taiwanese 16-tile gives you the biggest hand and no card telling you what is allowed. If you are in the US and want to join an existing group, it will almost certainly be American.
Where can I practise?
We build free browser tools for Taiwanese 16-tile mahjong — no signup, no download. Start with the pung/chow/kong trainer to get the basic calls into muscle memory. For American mahjong you will need the current NMJL card, which we do not reproduce here for copyright reasons.
