Stack-to-Pot Ratio (SPR)

What Is Stack-to-Pot Ratio?

Stack-to-Pot Ratio (SPR) is calculated by dividing the effective stack by the pot size, typically on the flop. If the pot is 20bb and you have 90bb behind, the SPR is 4.5. SPR tells you how many streets of betting it takes to get all-in and which hand types benefit from commitment.

SPR Categories and Hand Selection

The SPR fundamentally changes which hands want to play for stacks:

• Low SPR (1-4): Common in 3-bet and 4-bet pots. Overpairs, top pair top kicker, and strong draws all commit comfortably.
• Medium SPR (4-8): Typical of single-raised pots. Sets, two pair, and combo draws stack off well. Top pair should avoid inflating the pot beyond two streets.
• High SPR (8+): Deep-stacked single-raised pots. Only premium made hands and nut draws justify stacking off. Top pair becomes a pot-control hand.

Practical Example

You 3-bet to 9bb and get called. The pot is 19bb with 91bb behind, giving an SPR of roughly 4.8. You flop A-K on an A-7-2 rainbow board. At this SPR, top pair top kicker commits easily across three streets: bet 6bb on the flop, 16bb on the turn, and shove the remaining 69bb on the river.

Now consider the same hand in a single-raised pot. The pot is 7bb with 97bb behind, an SPR of 14. Top pair top kicker can no longer comfortably bet three streets for stacks. Risking your entire stack with one pair at high SPR is typically a mistake.

SPR and Geometric Sizing

SPR connects directly to bet sizing. A geometric bet size divides the remaining stack evenly across the streets needed to get all-in. Lower SPR means fewer streets, while higher SPR requires larger bets or more streets. Understanding how SPR interacts with Implied Odds helps you plan your entire hand from the flop forward.

Use the Stack to Blinds Calculator to compute SPR for any scenario, and Postflop+ to practice commitment decisions at different SPR levels. The Postflop Decision Making Framework provides a complete system for integrating SPR into your postflop planning.