SPR (Stack-to-Pot Ratio)
The ratio of effective stack to pot size after the flop, used to plan postflop commitment decisions.
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What Is SPR (Stack-to-Pot Ratio)?
SPR is calculated by dividing the smaller of the two remaining stacks by the size of the pot at the start of a betting round, most commonly the flop. A low SPR (roughly 1-3) means a player is likely to get all-in with one pot-sized bet, favoring hands like top pair or overpairs, while a high SPR favors hands with strong implied odds, such as sets and drawing hands, since there's more room to maneuver.
Examples
A $300 pot with $300 effective stacks remaining gives an SPR of 1, meaning one pot-sized bet commits both players.
A deep-stacked cash game hand reaching the flop with an SPR of 20, allowing much more post-flop play.
Strategy Tips
With a low SPR, simplify your decisions -- strong made hands like top pair or better are usually worth getting all-in with, since there's little room for maneuvering. With a high SPR, be more cautious with one-pair hands and prioritize hands that can make the nuts, like suited connectors and pocket pairs with set potential. Preflop raise and re-raise sizing directly controls the SPR you'll see on the flop, so use bet sizing intentionally to set up favorable SPRs for your hand types. Multi-way pots naturally lower the effective SPR per opponent's equity, which should tighten your continuation strategy.