Bet Sizing in Poker: A Street-by-Street Guide 2026

Every bet you make sends a price signal. Too small and you give draws correct odds. Too large and you fold out the worse hands you wanted to pay you.

Knowing how much to bet in poker comes down to three variables: the board, your opponent, and the stack-to-pot ratio. Not your hand in isolation.

Every bet size controls three things at once: the pot odds you offer your opponent, the fold equity you generate, and the stack-to-pot ratio on future streets. Getting all three right on every decision is worth more bb/100 than any other single skill below NL500.

Here is what this guide covers:

Preflop Sizing

Preflop is the one street where sizing follows clear, memorisable rules. Once you know the numbers below, every preflop decision becomes faster and more consistent.

Open-Raise by Position and Format

Live opens are larger because live opponents call wider: a 2.5x raise at $1/$2 often gets four callers, turning your positional edge into a multiway coin flip. Raising to 3x or 4x prices out the weakest hands and gets you closer to heads-up pots.

The small blind raises larger in every format. You are guaranteed to be out of position against the big blind, so a bigger raise compensates for that disadvantage.

Below 20bb in tournaments, open-raising gives way to shove or fold. Push/fold charts by stack depth are covered in the MTT strategy guide linked at the bottom of this page.

Adjusting for Limpers

Add 1bb per limper to your standard open. Cap at 6bb to 7bb regardless of how many limpers are in the pot.

If 6bb still gets four callers (common at live low stakes), tighten your isolating range rather than sizing up further.

3-Bets, 4-Bets, and Short Stacks

Below 30bb, any 3-bet is a stack commitment. Either shove or do not re-raise. Trying to 3-bet to 8bb with a 25bb stack and then folding to a shove is one of the most expensive tournament sizing errors. The 3-bet strategy guide covers which hands to 3-bet with and when to 3-bet light.

Flop Sizing

The flop has the widest range of correct bet sizes. The key variable is how the board interacts with both players’ ranges, not the strength of your specific hand. For when to c-bet versus when to check, see the continuation betting guide. This section covers the sizing decision after you have already decided to bet.

Sizing by Board Texture

On dry boards, bet 25% to 33% pot with 70% to 80% of your range. A 25% pot bluff risks 1 unit to win 4: it only needs to work 20% of the time. Opponents call with hands they would fold to a half-pot bet (pocket pairs below top pair, ace-high, backdoor draws), which means your value bets also profit at the small size.

On wet boards, bet 66% to 80% pot with a narrower, more polarised range. A flush draw has roughly 35% equity on the flop, and if you bet 25% pot, they need just 17% equity to call. You are paying them to chase.

Sizing up denies correct odds and forces draws to pay a steep price. The equity denial guide covers the full EV math.

The Wetness Parabola

As boards get wetter, the correct bet size goes up. But at a certain point, the board becomes so connected that neither player has a clear range advantage, and the correct sizing flips back to small or to checking.

On J-T-8 two-tone, the preflop raiser still has more overpairs and big aces. On 8-7-6 with two suits, the big blind’s calling range connects just as heavily with 9x, 5x, suited connectors, and sets.

Neither player has a clear advantage, so large bets risk building a pot you cannot control.

Quick test: before sizing up on a wet board, ask who the board is better for. If the answer is “the preflop raiser,” bet large. If “roughly equal” or “the caller,” bet small or check. The range advantage guide covers how to identify which player each board favours.

3-Bet Pots and Multiway Adjustments

In 3-bet pots, the SPR is typically 3 to 5 instead of 10 to 15. C-bet 25% to 40% pot. A 33% bet into a 22bb 3-bet pot is ~7bb, roughly the same absolute size as a 75% bet into a 9bb single-raised pot.

The lower SPR means a small flop bet followed by a turn shove is the natural geometric progression.

In multiway pots, add 10% to 15% pot per extra opponent beyond heads-up. If you would bet 50% pot heads-up on a semi-wet board, bet 60% to 65% three-way and 70% to 75% four-way. Your betting range also tightens: the more opponents, the higher the chance at least one connected with the board.

Turn Sizing

The turn is where sizing mistakes cost the most. There is only one card left, and any draw that was getting a good price on the flop becomes more dangerous if you undersize. For when to barrel versus when to check, see the double barreling guide. This section covers the sizing decision.

The 66% Pot Minimum

On the turn, 66% pot is the floor for most bets. Below that, too many draws get correct implied odds to call.

The one exception: when your range is merged (betting medium-strength hands for thin value rather than polarising), a smaller turn bet of 40% to 50% pot can be correct. The value betting guide covers when thin value sizing is right.

Planning Three Streets with SPR

Your turn bet is the middle step in a three-street plan. Choose a size that leaves a river SPR between 0.8 and 2.0, which gives you a natural river shove or a comfortable 75% to 100% pot value bet.

Use the SPR calculator to run these numbers for your most common preflop scenarios before each session.

River Sizing

The river is where sizing has the highest impact per decision. No more cards to come, your opponent’s range is at its most defined, and the pot is at its largest.

75% pot is the default value bet. Population solver data shows it produces the highest total EV across the widest range of opponent types at low and mid stakes. It sits at the sweet spot: a smaller bet gets called more often but wins less per call, a larger bet wins more per call but gets called less often.

Push to 100% pot against calling stations (they call the same range regardless of size), on scary boards where you hold the nuts (opponents suspect a bluff on the scare card), or when the action suggests your opponent holds a strong but second-best hand.

Block bets (20% to 40% pot) work with medium hands against passive opponents. A small bet gets called by worse (third pair, ace-high) while keeping the pot small enough that a raise does not cost you too much. Against aggressive opponents who raise small river bets frequently, checking and calling is usually better than block-betting.

For overbet conditions, geometric planning from flop to river jam, and bluff-to-value ratios by size, see the overbetting guide.

The 6 Most Expensive Sizing Mistakes

This guide covers the core sizing rules. For tournament sizing with ICM and short stacks, see the MTT strategy guide. For adjusting sizes by opponent type, the fish guide and cash game strategy guide cover exploitative adjustments in detail.

Frequently Asked Questions