fold equity calculator

What Is Fold Equity?

Fold equity is the portion of your expected value that comes from making opponents fold. In practical poker terms, when you bet or shove, you can win in two ways:

• Your opponent folds and you win the pot immediately.
• Your opponent calls, and you still have some chance to win at showdown.

Good aggressive play balances these two sources of value. If your opponent folds too often, even hands with modest showdown value can become profitable bets.

The Core Formula

This calculator uses a standard expected value model for a bet:

• FE = fold frequency (how often villain folds)
• P = pot before your bet
• B = your bet size
• E = your equity when called (as a decimal)

Break-even fold frequency is the minimum FE that makes EV equal to zero.

Pure-Bluff Shortcut

If your hand has effectively 0% equity when called, break-even fold frequency simplifies to:

Example: betting 75 into 100 needs 75 / 175 = 42.86% folds to break even as a pure bluff.

How to Use This Calculator

1) Set the pot and bet size

These are straightforward. If the pot is 100 and you bet 75, those are your first two inputs.

2) Estimate equity when called

This is often where players make big mistakes. Be realistic. A low-equity draw facing a strong continuing range might be only 15–25% when called.

3) Estimate fold frequency

Use population reads, player tendencies, and board texture. Against a sticky player in a single-raised pot, your fold estimate might be lower than GTO assumptions.

4) Compare EV and break-even FE

• If your estimated fold frequency is above break-even FE, your bet is likely profitable.
• If it is below break-even FE, your bluff portion likely loses chips.

Quick Strategy Notes

• Bigger bets require more folds as pure bluffs, but they may create more folds in practice.
• Higher equity lowers required fold frequency. Semi-bluffs are powerful because they can win both now and later.
• Board interaction matters. Your line should credibly represent value hands.
• Pool tendencies beat static math. Exploit over-folding and avoid bluffing stations.

Common Mistakes in Fold Equity Calculations

• Ignoring rake or tournament ICM effects in marginal spots.
• Overestimating how often opponents fold to turn and river barrels.
• Using equity versus entire range instead of realistic calling range.
• Forgetting blockers and removal effects when choosing bluff combos.

Reference Table (Pure-Bluff Break-Even FE)

Final Takeaway

Fold equity is one of the most useful concepts in poker math because it connects strategy and expected value directly. Use this calculator to sanity-check your bluff spots, tune your sizings, and improve your aggression in a disciplined way.