Pot Odds Calculator

What pot odds actually are

Pot odds are the price the pot is laying you to call. If $40 is in the middle, their bet included, and you have to call $10, you are risking $10 to win that $40. Players say that as a 4-to-1 price. After your call the pot is $50, and your $10 is a fifth of it, so the break-even equity is 10 ÷ 50 = 20%. Any hand with at least a 20% chance to win is a +EV call.

Note which $50 that is. It is the pot after your own chips go in, and forgetting to include them is the most common arithmetic slip in poker. Ratio and percentage are the same fact said two ways: an X-to-1 price needs 1 ÷ (X + 1) equity, so 4-to-1 needs a fifth.

The percentage form is more useful in practice:

pot_odds_percent = call_amount ÷ (pot_including_their_bet + call_amount) × 100

That single number tells you the minimum equity your hand needs. Equity above it, call. Below, fold, unless implied odds bail you out.

Enter the pot with their bet already in it. That is what “the pot” means at the table, and it is what this calculator expects. Our Expected Value calculator asks for the pot before the bet and adds the call itself, so the same spot is typed in differently on the two pages. Both give the same answer when you feed each the number it asks for.

The rule of 2 and 4, fast equity math at the table

You will not run pot odds calculators while at a casino table. Use Phil Gordon’s shortcut for drawing hands:

• Counting only the turn card, because there is still a river bet coming: outs × 2 ≈ equity percent
• Counting both the turn and the river, which is only fair if nobody can bet again: outs × 4 ≈ equity percent
• On the turn waiting for the river: outs × 2 ≈ equity percent

Open-ended straight draw: 8 outs. Flop to turn equity ≈ 16%, flop to river ≈ 32%. Flush draw: 9 outs. Turn equity ≈ 18%, river equity ≈ 36%. Gutshot: 4 outs ≈ 8% per card.

Common bet sizes and the equity they demand

These are fractions of the pot before the bet, which is how bet sizes are always described. A half-pot bet into $100 is $50, and you then call $50 into a $150 pot for a final pot of $200, so your $50 is a quarter of it. Hence 25%.

The jump from half-pot to pot-sized doubles the bet but only adds 8 percentage points to the equity hurdle. That is one reason half-pot bets are so common: they get folds without committing the bettor.

The biggest beginner mistake

Calling because “the pot is so big I can’t fold.” If your hand has 10% equity and pot odds demand 30%, the size of the pot is irrelevant.

It is worth doing that arithmetic properly, because the intuitive version understates it badly. Needing 30% means your call of $1 is buying a shot at a final pot of $1 ÷ 0.30 = $3.33. With 10% equity you collect that pot one time in ten, so you make $0.33 on average and you spent $1. You lose 67 cents of every dollar you call, not the 20 cents you get by subtracting 10 from 30. Pot size affects implied odds, where winning is bigger. It does not affect the math of this specific decision.