An out is any unseen card in the deck that, if dealt, would improve your hand to (likely) the best hand. For example, holding four hearts gives you 9 flush outs — the 13 hearts in the deck minus the 4 you already see.

What is the Rule of 2 and 4?

A quick mental shortcut: multiply your outs by 4 when two cards remain (flop to river), or by 2 when one card remains (turn to river). This gives an approximate percentage chance of hitting. The tool shows both the approximation and the exact probability.

Pot odds express the ratio of the call amount to the total pot after calling. For example, calling $20 into a $60 pot gives pot odds of 20/(60+20) = 25%. If your hand equity exceeds 25%, calling is profitable over the long run.

When should I fold even with strong draw equity?

If the pot odds percentage is higher than your equity percentage, folding is the mathematically correct play. Also consider implied odds (future bets you can win) and reverse implied odds (money you might lose when you hit but still lose).

How many outs does a flush draw have?

A flush draw has 9 outs: 13 cards of each suit minus the 4 you already see. An open-ended straight draw has 8 outs, a gutshot straight draw has 4 outs, and a set draw (one pair to trips) has 2 outs.

Does this account for blockers or card removal?

This tool assumes no knowledge of opponents' hole cards. In practice, some outs may be in opponents' hands (dead outs), slightly reducing actual equity. Adjust your out count down by 1-2 when you suspect opponents hold cards that block your draw.

Poker Outs Calculator

Name: Poker Outs Calculator
Availability: InStock
Author: Nham Vu

Enter your number of outs and the pot/bet sizes to instantly see your hit probability and whether calling is mathematically profitable.

Street

Common Draws

Number of Outs (1 – 47)

Pot Odds (optional)

Pot size ($)

Bet to call ($)

Hit Probability

Exact probability

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Rule of 2 & 4

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Pot Odds Analysis

Enter pot size and bet to call above to see pot odds analysis.

Common Outs Reference

Draw type	Outs	Turn %	River %	Both %

Summary

Enter your number of outs and the pot/bet sizes to instantly see your hit probability and whether calling is mathematically profitable.

How it works

Count the unseen cards that would complete your drawing hand — these are your outs.
Enter the number of outs and select whether you are facing the turn (one card left) or the river (two cards left).
The tool calculates hit probability using both exact math and the Rule of 2 & 4 approximation.
Enter the current pot size and the bet you must call to get your pot odds percentage.
Compare your equity percentage to your pot odds percentage — if equity exceeds pot odds, calling is profitable.

Use cases

Decide whether to call a bet on the flop with a flush or straight draw.
Quickly estimate your odds of hitting a set by the river with a pocket pair.
Validate pot odds in real time during live or online cash game play.
Study the math behind common draws like open-ended straights (8 outs) or flush draws (9 outs).
Learn the Rule of 2 & 4 shortcut versus exact probability.
Evaluate semi-bluff spots where fold equity plus draw equity justifies a raise.
Compare multiple drawing scenarios side by side using the quick-select buttons.
Build intuition for when a gutshot (4 outs) is never worth calling a large bet.

Frequently Asked Questions

Last updated: 2026-07-01 · Reviewed by Nham Vu