Postflop Math

Postflop · updated 2026-03-08

Basic Situations

1. Facing a Bet:

Decision to call or fold depends on:

• Equity of the hand vs opponent's range
• Pot Odds
• Implied Odds
• Reverse Implied Odds

2. We Bet:

Decision to bet (value or bluff) depends on:

• Equity of the hand vs opponent's range
• Fold Equity — probability that the opponent will fold

Formulas

Formula 1 — Profit by Equity:

Profit = Equity − Pot Odds Share

Example:

• In an all-in we have 55% equity, invested 45% of the pot
• ➡ Profit = 10%

Formula 2 — With Implied Odds:

Profit = Equity − Pot Odds Share + Implied Odds − Reverse Implied Odds

Equity Realization (Realization Factor)

The percentage of theoretical hand equity actually realized in winnings.

Influencing factors:

• Position (better in position)
• Playability of the hand
• Stack depth
• Range advantage
• Opponent skill level
• ICM pressure (bubble factor)

Pot Odds

Pot Odds = Your Call / (Pot Before Call + Your Call)

Table

Fold Equity

Probability that opponent folds to our bet

Calculated via break-even bluff formula:

FE > Bet Size / (Bet Size + Pot)

Implied Odds

Potential future profit if we hit our hand

Formula:

1 / Equity × Call – (Pot Before Call + Call)

Reverse Implied Odds

Situations where hitting our draw still loses to a stronger hand

Examples:

• Low flush draws on paired boards
• Medium straights on two-tone boards

Poker Terminology

ChipEV and ICM

Bubble Factor (BF):

BF = Loss in equity share if lose / Gain in equity share if win

ICM pressure effects:

• Lower BB call frequency
• Change in postflop lines
• Requirement for greater "ICM premium" in %

Conclusion

Mathematics and logical understanding of the game are the basis for long-term progress. Key skills:

• Seeing profitability of actions through formulas
• Realizing equity and using fold equity
• Avoiding intuitive mistakes
• Mastering terminology to “think like a player”

Goal: turn these concepts into automated in-game skills.