SPR Calculator

How stack-to-pot ratio works

SPR is your (or the shorter of the two) effective remaining stack divided by the current pot: stack / pot. A low SPR means one or two more bets get all the money in, so hand-strength thresholds for stacking off are lower; a high SPR means there is a lot of stack left relative to the pot, so speculative hands and postflop play matter more than raw made-hand strength.

Worked SPR examples

1. Example 1

   A committed, shallow SPR

   Effective stacks are $150, the flop pot is $100. SPR = 150 / 100 = 1.5. A single pot-sized bet and raise gets the rest in — top pair or better is usually happy to stack off.

2. Example 2

   A standard single-raised-pot SPR

   Effective stacks are $400, the flop pot is $100 (a typical 100bb single-raised pot). SPR = 4 — the classic “medium” range where overpairs and top pair, top kicker can stack off but weaker top pairs often can’t.

3. Example 3

   A deep-stacked SPR

   Effective stacks are $1,000, the flop pot is $60 (a limped or min-raised pot). SPR = 16.7 — very deep. One pair hands are rarely good enough to get all-in for; sets, straights and flushes do the stacking off here.

Related pages

• Push/Fold Charts →
• ICM Calculator →
• Push/fold lesson →
• Glossary: effective stack →
• Every ranked puzzle type →

Frequently asked questions

What is stack-to-pot ratio?

SPR is your effective remaining stack divided by the current pot. A low SPR means one or two more bets commit the rest of the stack, so lower hand strength is needed to stack off; a high SPR means postflop play and speculative hands matter more than raw made-hand strength.

What counts as the "effective" stack?

The smaller of the two stacks involved in the pot (heads-up) — you can never win more than the shorter stack, so that is the number that matters for commitment decisions.