Table of Contents
Poker is a game of probability and expected value. Players who run on feel alone fall behind those who understand pot odds, equity, and SPR. This guide covers all three with worked examples.
1. Pot odds: the equity you need to call
Pot odds are the minimum win rate needed to call profitably:
Required equity = amount to call ÷ (total pot after you call)
Example: pot is 100, opponent bets 50. Calling 50 makes the pot 200, so required equity = 50 ÷ 200 = 25%. If your hand’s equity beats 25%, the call is justified.
2. Equity: estimate from your outs
You can estimate a draw’s equity from its outs with the 4-2 rule:
- Flop → river (2 cards): outs × 4%
- Turn → river (1 card): outs × 2%
Example: a flush draw (9 outs) is about 9×4 = 36% on the flop — above the 25% required, so calling is justified.
3. SPR: measuring commitment
SPR (Stack-to-Pot Ratio) = effective stack ÷ pot on the flop. It tells you how strong a hand you need to stack off.
| SPR | Situation | Hands that commit |
|---|---|---|
| Low (≤3) | Shallow; top pair can commit. | TPTK, overpairs |
| Medium (4–6) | Standard; two pair+. | Two pair, strong draws |
| High (10+) | Deep; want a set or better. | Sets, nut hands |
The lower the SPR, the weaker a hand you can stack off with. Preflop action (3-bets, etc.) changes SPR a lot, so you can plan the hand before the flop even comes.
Putting them together
In practice: compute required equity from pot odds → compare to your equity → judge commitment via SPR. Slow at first, but once you memorize the common numbers (25%, 36%) it becomes instant.
Summary
Pot odds, equity, and SPR turn poker decisions from “feel” into “reasons.” Start by using pot odds and the 4-2 rule at the table.
Related reading
This article was prepared by the Poker GTO Lab editorial team for educational purposes, drawing on widely published solver outputs, training content, and preflop charts. The ranges and frequencies shown are representative tendencies; the true optimum depends on stack depth, opponents, and table rules. This site does not promote gambling.