TL;DR A 3-bet is a re-raise before the flop. The name comes from counting betting actions: blinds = 1st bet, open raise = 2nd bet, re-raise = 3rd bet. Size it to 3x the open when you're in position, 4x out of position. Your 3-bet range should include premium hands for value and a handful of well-chosen bluffs. In tournaments, once effective stacks drop below 25-30 big blinds, a 3-bet to a normal size commits you to the pot anyway; at that point, just shove.
What is a 3-bet in poker?
A 3-bet is a re-raise preflop. Someone opens the action with a raise; you raise over the top of them. That's a 3-bet.
The name comes from the way poker counts bets. Posting the blinds is the first bet — forced, but it's a bet. An open raise from any position is the second bet. When you put in a third raise, you're making the third bet in the sequence. Hence: 3-bet.
This is also just called a re-raise, and that's equally correct. But once the action heats up further and someone re-raises your re-raise, the numbered system becomes much easier to track than saying "re-re-raise." A 4-bet is a raise over a 3-bet. A 5-bet is a raise over a 4-bet. At that level, almost every hand going to showdown is AA versus KK or AK.
Why 3-bets are effective
The opener raised for a reason: they want to control the pot size, pick up the blinds cheaply, or build a pot with a strong hand. A 3-bet disrupts all three goals simultaneously.
It forces a decision before the flop. The opener has committed chips, but not enough to be pot-committed. They either continue by committing more or abandon what they've already invested. That's a hard spot, and many hands that play fine as an open can't profitably call a 3-bet.
It narrows the field. Players behind you who would have called a single raise face a much larger price. Suited connectors, weak aces, and speculative hands don't get the odds they need. You reduce the number of opponents, which increases your equity in the pot.
When you do hold a strong hand, it builds the pot early. Raising preflop with aces and getting called means going to the flop with 20-30 big blinds already in the middle. That's real money, and you're betting it with the best hand.
What hands go in a 3-bet range
There are two main approaches to building a 3-bet range: polarized and linear.
A polarized range combines your very best hands with a selection of bluffs at the other end. Premium holdings (AA, KK, QQ, AK) are the value side. On the bluffing side, you want hands with some post-flop potential — suited aces like A5s or A4s, or suited connectors like 76s. These hands can hit the flop in useful ways when they do connect, rather than just flopping two overcards that dominate nothing.
A linear (or merged) range takes your best hands and your next-best hands instead of value plus bluffs: AA through JJ, AK and AQs, maybe TT in position. This approach works well when you have a positional advantage and can realize equity post-flop.
For most home game and club tournament players, polarized is simpler to implement without getting out of line. The bluffs come from the bottom of what you'd normally call with: hands you can profitably fold from the calling range to shift into the 3-bet range instead.
The one hand players consistently mishandle: medium pairs like 77-99. These don't 3-bet well and don't call well from out of position. In most spots they're calling hands when in position and folding hands when out of position, not 3-bet candidates.
How to size a 3-bet
Sizing is where many players go wrong. A 3-bet that's too small is cheap to call; one that's too large puts you in an odd spot when your bluff gets called.
Starting points:
- In position: 3x the open raise. An open to 3bb becomes a 3-bet to 9bb.
- Out of position: 4x the open raise. Same open becomes a 12bb 3-bet. The extra size compensates for the disadvantage of acting first on every street after the flop.
- Add 1bb per limper. If someone opened and there's a cold-caller behind them, bump the size by 1bb for each extra player in the pot before you.
Consistency matters. If you size your value 3-bets to 12bb and your bluff 3-bets to 9bb, observant opponents will notice. Keep the sizing the same regardless of hand strength, and adjust the overall size based on position and field.
One adjustment worth making: against recreational players who call nearly everything preflop, size your value 3-bets bigger. Against tight players who fold to any 3-bet, smaller sizes build the same fold equity at lower risk.
3-bets in tournaments: stack depth changes everything
In a cash game, 100 big blinds is standard and the math is relatively stable. Tournament poker complicates this. Blinds rise, effective stacks compress, and a "standard" 3-bet can suddenly represent a large fraction of someone's stack.
The practical threshold to know: when effective stacks are 25-30 big blinds or below, a 3-bet to a normal size typically commits you to calling a shove anyway. At that point, raising to 3x and then folding to a 4-bet loses more than just moving all in directly. The 3-bet shove becomes the correct play: simpler, more credible, and far harder to play against.
When stacks are above 40bb, conventional sizing works fine.
The 30-40bb range is genuinely awkward. If you have a value hand, you can 3-bet to a size and call the shove. If you're bluffing, you usually shouldn't be building a pot you can't continue in. The cleaner line for a bluff at that stack depth is often to look for a different spot.
Stack depth also changes 3-bet frequency near the bubble. Players protecting medium stacks for ICM reasons fold hands they would normally continue with. That makes 3-bet pressure unusually effective against those players. On the other side, getting called near the money by a big stack can be a problem if you're the one protecting your stack. For a full breakdown of how chip equity shifts near the money, see the ICM poker guide.
If you're watching the blinds tick up on NextBlind's tournament timer, pay attention to how the average stack size changes relative to the blinds. A 20bb average table plays differently from a 40bb average table, and knowing which environment you're in sharpens every preflop decision.
How to respond when someone 3-bets you
Being on the receiving end of a 3-bet gives you three options: fold, call, or 4-bet.
Folding is correct more often than newer players expect. If a tight player 3-bets from early position, hands like AJo, KQo, and TT can be clean folds. Their 3-betting range from that seat is narrow and weighted toward hands that crush these. Calling with a dominated hand and going to the flop hoping to hit isn't a plan; it's a slow leak.
Calling makes sense with hands that play well post-flop when you have position. Medium pairs (77-99) often just call in position against a 3-bet rather than committing to a 4-bet or fold decision preflop.
4-betting is primarily for premiums (AA, KK, sometimes QQ and AK) and for a small number of well-timed bluffs. For most players in a home tournament, a 4-bet is almost always for value. Against an unknown opponent, the default is usually: either fold or get your money in, not 4-bet as a creative play.
One thing to avoid: calling a 3-bet that commits 50-60% of your stack with the vague plan to "see the flop and reassess." That's not a plan. Hands in that commit zone are fold-or-shove decisions preflop.
Position and the 3-bet
Position amplifies every advantage the 3-bet creates. From the button or cutoff, you'll act last on every street after the flop. That lets you realize equity on more hands, bluff with more information, and win pots that would be difficult to navigate from out of position.
From the big blind or small blind, tighten up significantly. Your bluffs need to work at the preflop stage more often because post-flop will be harder. Value 3-bets from the blinds still make sense. Bluff 3-bets from the blinds should be done sparingly and against players who fold a lot.
One of the most common mistakes in home tournaments is 3-betting from the small blind with a hand like KJs against an EP open. You're out of position, your hand is not premium, and the EP player's range has your hand crushed a reasonable fraction of the time. That's a fold, not a 3-bet.
3-bet poker FAQ
What is a 3-bet in poker?
A 3-bet is a re-raise before the flop. The small and big blinds count as the first bet, an open raise is the second, and a re-raise over that open is the third. It applies strictly to preflop action; post-flop raises use different terminology.
Is a 3-bet the same as a re-raise?
Yes. The two terms describe the same action. "3-bet" is the numbered convention, useful because it extends cleanly: a 4-bet is a re-raise of a 3-bet, a 5-bet is a re-raise of a 4-bet.
What hands should I 3-bet?
For value: AA, KK, QQ, and AK at minimum. JJ and AQs become 3-bets from late position against wider opening ranges. As semi-bluffs: suited aces (A5s, A4s) and suited connectors that can hit nutted hands on the right boards. Avoid 3-betting medium-strength hands like KJo or ATo, which are caught in the middle and play better as calls or folds.
How big should a 3-bet be?
3x the open raise in position, 4x out of position. Add 1bb per extra player already in the pot. Keep sizing consistent regardless of hand strength.
What is a light 3-bet?
A 3-bet with a hand below the premium value range, used as a semi-bluff or pure bluff. Done in the right spot against a player with a high fold-to-3-bet frequency, it's a profitable play. Done too often or against the wrong players, it's an expensive habit.
When should I just fold to a 3-bet?
More often than feels comfortable. Against a tight range from early position, hands like AJo, KQo, and even JJ can be fold candidates. The mistake is calling because the hand "looks good" without accounting for how it interacts with the 3-bettor's range.
Putting the 3-bet to work
The 3-bet earns chips in two ways: by picking up pots preflop and by building larger pots when you're ahead. Neither is useful if you're applying it indiscriminately. The players who 3-bet everything are easy to read; the players who 3-bet nothing are easy to run over.
The real discipline is range construction: knowing which bluff candidates slot in, sizing consistently so opponents can't read your hand strength, and folding the middle-ground hands that don't belong in a 3-bet range at all.
Stack depth in tournaments adds another layer. As blinds rise and stacks compress, the line between "3-bet to a size" and "3-bet shove" shifts constantly. Keeping track of who has how many chips relative to the blinds is not optional at that stage of a tournament.
NextBlind's tournament manager shows live stack depths alongside the blind clock, so you always know which players are in shove range and which have enough chips that a normal 3-bet-and-fold line still makes sense. Start a tournament free at NextBlind. It runs in any browser, no install needed.
For what happens after the 3-bet is called and you're making decisions on the flop, the continuation bet guide covers when to fire, when to check, and how board texture changes the math.
