SPR in Poker: The Ratio That Decides Whether You Can Fold
Stack-to-Pot Ratio: the remaining stack divided by the pot. The number that says BEFORE the flop which hands will be able to fold — and which are married to the pot.
Lou · · 2 min
SPR — stack-to-pot ratio — is the effective remaining stack divided by the pot size on the flop. This simple ratio answers poker's most expensive question: can I still fold, or am I already married to the pot?
The calculation and thresholds
Pot of 10, stacks of 40 behind: SPR 4. The benchmarks: below 3, you're virtually committed with any top pair — no more maneuvering, decisions simplify. Between 4 and 8, the playing zone: deep enough to fold, short enough to stack off in two bets. Above 10, caution rules — you need a real hand to play for stacks.
Why it changes your decisions
- Preflop crafts the SPR: 3-betting creates a small SPR (perfect for AA-KK, which want to stack off); calling keeps a high SPR (perfect for speculative hands).
- On the flop, SPR dictates commitment: top pair at SPR 2 doesn't fold; the same hand at SPR 12 must know how to say no.
- In tournaments, SPRs run naturally low: that's why play there is more direct than in deep cash.
The classic mistake
Playing the same hand the same way at SPR 2 and SPR 12 — overplaying top pair deep, underplaying it short. The reflex is built: one glance at the ratio before every flop decision. The PokGenius Trainer varies depths precisely to engrave that automatism, and the postflop hub places SPR back into the full tree.
Turn theory into reflexes
Solver ranges, ICM spots, instant feedback. Train 20 minutes a day on real hands.