Bet Sizing

Also known as: bet sizing, sizing, bet size

Choosing how much to bet relative to the pot to maximize EV given range shape, board texture, and stack depth.

Bet sizing is the lever that links your range to the pot. Small bets (25–40% pot) work with a wide, merged range on dry boards where you deny equity cheaply; large bets (66–100%) and overbets suit polarised ranges with a strong nut advantage. The size you pick sets the opponent's pot odds, their Minimum Defense Frequency, and the bluff-to-value-ratio you must run to stay balanced — at a chosen sizing the bluff fraction equals \(\tfrac{b}{p+2b}\) of your betting range on the river.

Sizing is constrained by SPR: with low SPR a single bet commits the stack; deeper, you can build the pot across streets via geometric sizing. Multiple sizes per node (a small and a large) let a strong range fork value and bluffs efficiently, which is why solvers mix them. Match the size to the goal — fold equity, value extraction, or protection — not to a fixed habit. The Pot Sizing Calculator translates a pot-fraction into chips at the table.

Example

Dry K♠ 7♦ 2♣ flop, you have the range advantage: a 33% c-bet (e.g. 3 into 9) prints with your whole range because villain can't raise profitably and must fold a lot. On a dynamic J♥ T♥ 9♠ board, you instead split to 75%+ and overbets so your nutted combos and draws charge the many continuing hands.