Poker Calculator

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Poker Calculator (Odds & Equity)
Pot Odds (Percentage & Ratio)Equity (Rule of 2 & 4)Expected Value (EV)
Flop (2 cards to come)Turn (1 card to come)
Result:
Enter values and click Calculate
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2. Percentage = (Call / Total Pot) * 100 = ('+v2+' / '+totalPot+') * 100 = '+perc.toFixed(2)+'%';}}else if(mode==='equity'){var mult=parseFloat(document.getElementById('input3').value);var equity=v1*mult;ans.innerHTML='Estimated Equity: ' + equity.toFixed(1) + '%';if(show){stepDiv.style.display='block';stepDiv.innerHTML='1. Outs = '+v1+'
2. Rule used: Multiplier of '+mult+'
3. Equity = '+v1+' * '+mult+' = '+equity+'%';}}else if(mode==='ev'){var v3=parseFloat(document.getElementById('input3').value);var winP=v1/100;var lossP=1-winP;var ev=(winP*v2)-(lossP*v3);ans.innerHTML='Expected Value (EV): ' + (ev >= 0 ? '+' : ") + '$' + ev.toFixed(2);if(show){stepDiv.style.display='block';stepDiv.innerHTML='1. Win Prob = '+winP.toFixed(2)+', Loss Prob = '+lossP.toFixed(2)+'
2. EV = (Win% * Win$) – (Loss% * Call$) = ('+winP+' * '+v2+') – ('+lossP+' * '+v3+') = '+ev.toFixed(2);}}else{ans.innerHTML='Error';}}

Using the Poker Calculator

A poker calculator is an essential tool for any player looking to move beyond "gut feelings" and into the realm of mathematical certainty. This tool helps you calculate three critical metrics used at the table: Pot Odds, Hand Equity, and Expected Value (EV).

By mastering these numbers, you can determine if a call is profitable over the long run, how likely you are to hit your drawing hand, and whether a specific play has a positive or negative impact on your bankroll.

Pot Odds
The ratio between the size of the pot and the bet you are facing. It tells you how much equity you need to make a break-even call.
Equity (Rule of 2 & 4)
The probability of winning the hand based on your "outs" (cards left in the deck that improve your hand). We use the industry-standard Rule of 2 and 4 for quick estimation.
Expected Value (EV)
The average amount of money you expect to win or lose on a specific bet. +EV means a profitable play; -EV means a losing play.

The Mathematical Formulas

Professional poker players use these specific formulas to analyze their sessions. Our poker calculator automates these calculations for you:

1. Pot Odds Formula

Pot Odds % = (Call Amount / (Total Current Pot + Call Amount)) × 100

2. Equity (The Rule of 2 & 4)

To find your equity quickly on the flop or turn:

  • On the Flop: Number of Outs × 4 = % chance to hit by the River.
  • On the Turn: Number of Outs × 2 = % chance to hit by the River.

3. Expected Value Formula

EV = (Win% × $Win) – (Loss% × $Loss)

Poker Calculation Example

Scenario: You are on the flop with a flush draw (9 outs). The pot is $100, and your opponent bets $50. Should you call?

Step 1: Calculate Pot Odds

  • Call Amount = $50
  • Total Pot after call = $100 (original) + $50 (opponent bet) + $50 (your call) = $200
  • Pot Odds = 50 / 200 = 25%

Step 2: Calculate Equity

  • Outs = 9
  • Rule of 4 (Flop to River) = 9 × 4 = 36%

Conclusion: Since your equity (36%) is higher than your pot odds (25%), calling is a mathematically profitable (+EV) play in the long run.

Common Poker Math Questions

What is a "good" EV in poker?

Any number above 0.00 is considered a "good" EV because it represents a winning play over time. However, players often look for high EV spots to maximize their hourly rate. Even a marginally +EV play is technically correct, but may increase variance.

How accurate is the Rule of 2 and 4?

The rule is an approximation. The actual math for 9 outs on the flop is roughly 35.0%, while the Rule of 4 gives 36%. In the heat of a hand, a 1% difference is negligible, making this poker calculator's logic perfect for real-time strategy adjustments.

Why do I include my own call in the pot odds?

You are calculating your share of the final pot. To own that percentage of the pot, you must contribute your call. Therefore, the "Total Pot" must represent what is in the middle after all action for that street is finished.

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