What Is the Button in Poker?

The button is the seat that holds the dealer disc, directly to the right of the small blind, and it acts last on the flop, turn and river. That single structural fact — everyone else has to commit before you speak — makes it the most profitable seat at the table by a wide margin. Winning 6-max players earn the bulk of their money on the button and give a chunk of it back in the blinds.

How the button plays

Preflop the button acts second to last, with only the two blinds behind you. Postflop the order flips permanently in your favour: every check, every bet and every sizing arrives before you have to decide anything.

That information is worth more than the cards you were dealt. You can bet small and often when a flop misses a blind defender, check back marginal hands to keep the pot the size you want it, and give up cheaply when the story makes no sense. The player out of position has to guess first on all three streets.

A hand that shows the edge

You open to 2.5bb on the button with 9♠8♠ at $1/$2 and the big blind calls, making the pot $11. The flop is K♦7♣3♥, he checks, and you bet $5. A board that dry belongs to your raising range far more than his defending range, so the check-fold happens often enough that the bet prints on its own.

Say he calls and checks the 2♦. You now have a gutshot and a backdoor flush draw, and you can simply check back, take the free card and price a river decision with full information. From the big blind with the same hand you would be forced to lead into the raiser or check and hope. Both are worse, and the difference is nothing but seat order.

How wide to open it

The button opens far wider than any other seat because fewer players can wake up behind it and because you keep position on whoever calls.

Seat	Rough opening frequency (6-max)	Why
UTG	15-17%	five players still to act, all of them with position on you
BTN	40-45%	only the blinds left, and you play every street last

That means hands you would never touch from early position — Q♦5♦, J♣9♣, K♠4♠ — become straightforward raises. The solver-built preflop charts give you the exact button range rather than a percentage to guess at, which matters because the bottom of the range is where the errors live.

The mistakes that cost the most

Opening too tight. Folding 7♥6♥ or K♣6♣ on the button looks harmless and quietly costs a fraction of a big blind every orbit. Across a session of 30 orbits that is real money surrendered to two players who have to play the whole hand blind.

Opening far too wide. 9♣4♦ still plays badly in position once a big blind starts three-betting back at you, and the button is exactly where good regulars fight hardest.

Playing it passively. Position only pays if you use it: bet thin for value, take the free cards you are owed, and attack rivers when two checks have told you nobody has anything. Pay the blinds every orbit and then play the button like any other seat, and you have bought an advantage you never collected.