Poker math
Effective Stack in Poker — Formula, Examples & Quick Math
Effective Stack is a math concept that turns gut decisions into +EV ones. Here's how to actually 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
New to poker? Start with our preflop strategy guide and the free TAG cheatsheet.