What is a 3-bet in poker?
A 3-bet is the first re-raise preflop. The big blind counts as the first bet and the open-raise as the second, so re-raising the opener is the third bet — a 3-bet. It's used with premium hands for value and with selected weaker hands as a bluff.
Why it matters
3-betting is how you punish loose openers, take the initiative, and build big pots with your best hands instead of playing them small. A player who only ever calls raises lets every opener see a cheap flop with the whole range and never faces pressure.
The mistake in both directions is common: never 3-betting as a bluff (so good players fold everything but the top of their range when you do), and 3-betting the same range against every opener (an UTG open and a button open deserve very different answers).
The numbers
- In HoldemPro's charts the big blind 3-bets an UTG open 3.1% of the time, a button open 6.2%, and a small-blind open 8.1%.
- The small blind 3-bets a button open 11.8% and calls only 8.0% — out of position it mostly 3-bets or folds.
- 0.7% of the 147 players HoldemPro has diagnosed (1 players) have "3-bets too often" as their single biggest leak; under-3-betting is far more common than over-3-betting at low stakes.
Figures come from the same preflop charts and research data the rest of the site uses (charts last updated July 5, 2026); they change when that data does.
3-bet, call and fold ranges for every seat facing an open, plus a frequency matrix and sizing.
3-bet under 5% — you only re-raise the absolute nuts. Everyone folds when you do, killing your value.
Common questions
How big should a 3-bet be?
About 3× the open in position and 3.5–4× from the blinds. Versus a 2.5bb open that's roughly 7.5bb in position and 9–10bb out of position. Add about one open-size per caller when squeezing.
Which hands should you 3-bet as a bluff?
Small suited aces (A5s–A2s) first: they block AA and AK, make the nut flush when called, and fold cleanly to a 4-bet. Suited connectors and suited kings follow, at mixed frequencies.
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