Poker math

Effective Stack in Poker: Formula, Examples & Quick Math

Effective Stack is a math concept that turns gut decisions into +EV ones. Here is how to use it at the table.

Quick answer

Effective Stack: The smaller of two stacks in a heads-up pot, the most that can be won/lost.

In more detail

Always think in effective stacks, not your own stack. SPR is computed off effective stack, not yours.

Common questions

What does Effective Stack mean in poker?

Always think in effective stacks, not your own stack. SPR is computed off effective stack, not yours.

When should I use Effective Stack in a hand?

Effective Stack matters most when bet sizes and pot odds are close to your equity. In obvious folds and obvious calls, the math is just confirmation. Reserve mental effort for borderline spots.

Related terms

Equity
Your statistical share of the pot, expressed as a winning probability.
EV
The average profit/loss of a play over infinite repetitions.
Implied Odds
Pot odds adjusted for expected future bets if you hit your draw.
Outs
Cards remaining in the deck that improve your hand to a winner.

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