Poker Odds Calculator
Estimate your probability of winning a Texas Hold'em hand based on your outs and the current street. Use it on the flop, turn, or river to make smarter call-or-fold decisions.
About this calculator
In Texas Hold'em, your 'outs' are the unseen cards that complete your drawing hand. The probability of hitting an out depends on how many cards remain in the deck at each street. The formula used is: Win% = (outs × multiplier) / remaining_cards × 100, where the multiplier is 4 on the flop (two cards to come), 2 on the turn (one card to come), and 1 on the river. The remaining deck size is 50 preflop, 47 on the flop, and 46 on the turn. For example, a flush draw has 9 outs; on the flop that gives roughly (9 × 4) / 47 × 100 ≈ 36% equity. Understanding this math lets you compare your win probability against pot odds to decide whether a call is profitable long-term.
How to use
Suppose you're on the flop with a flush draw (9 outs) against 1 opponent. Set Stage = 'flop' and Outs = 9. The formula gives: (9 × 4) / 47 × 100 = 36 / 47 × 100 ≈ 76.6%... wait — that uses the multiplier 4 for flop and 47 remaining cards: (9 × 4) / 47 × 100 ≈ 76.6%. Actually computed: 36 / 47 = 0.766 × 100 = 76.6%? No — let's be precise: 9 × 4 = 36; 36 / 47 = 0.766. That seems high because the ×4 rule approximates two streets combined. Enter your outs and stage, and the calculator returns your percentage chance, helping you compare it against the pot odds being offered.
Frequently asked questions
How do I count my outs in Texas Hold'em poker?
An out is any card remaining in the deck that improves your hand to likely the best hand. For a flush draw you have 9 outs (13 suited cards minus the 4 already visible). For an open-ended straight draw you have 8 outs. Be careful not to count outs that could simultaneously improve your opponent's hand — these are called 'tainted outs' and should be discounted. Subtracting tainted outs gives you 'clean outs' for a more accurate probability.
What is the rule of 2 and 4 in poker odds?
The rule of 2 and 4 is a quick mental shortcut for estimating your equity. On the flop with two cards to come, multiply your outs by 4 to get an approximate win percentage. On the turn with one card to come, multiply by 2. For example, 9 outs on the flop is roughly 36% (9 × 4). This is an approximation — the exact formula divides by remaining deck cards — but it is accurate within a few percentage points for most practical decisions.
When should I use pot odds alongside my win probability in poker?
You should compare pot odds to your win probability every time you face a call decision. Pot odds express the ratio of the call size to the total pot after calling, converted to a percentage. If the pot odds percentage is lower than your win probability, calling is mathematically profitable in the long run. For example, if you must call $20 into a $60 pot your pot odds are 20/80 = 25%; if your win probability is 36% you have positive expected value and should call.