Poker Odds Calculator
Calculate the exact chance that at least one of your outs arrives by the river in Texas Hold'em, from your number of outs and the current street. Use it on the flop or turn to make smarter call-or-fold decisions.
Last updated: September 2026
Formula below · 1 source (Wikipedia) · Updated Sep 2026
Compare with similar
About this calculator
In Texas Hold'em, your outs are the unseen cards that complete your drawing hand. The chance of hitting at least one is 1 minus the chance of missing on every card still to come, counted exactly from the unseen cards. After the flop, 47 cards are unseen and two more come: P = 1 − ((47 − outs) / 47) × ((46 − outs) / 46). After the turn, 46 are unseen and one comes: P = outs / 46. Before the flop (with only your two hole cards seen), 50 cards are unseen and five come: P = 1 − ((50 − outs)/50 × (49 − outs)/49 × … × (46 − outs)/46). On the river no cards are left to come, so the calculator says so instead of giving a number. For example, a flush draw (9 outs) on the flop hits by the river 35.0% of the time and on the turn 19.6%; a pocket pair has 2 outs to make a set and does so by the river 19.2% of the time. The rule of 2 and 4 (outs × 4 on the flop, × 2 on the turn) is a mental shortcut for these numbers. Compare the result with your pot odds to decide whether a call is profitable; note the flop figure assumes you see both remaining cards.
How to use
Suppose you're on the flop with a flush draw (9 outs). Set Stage = After Flop and Outs = 9. Missing both cards has probability (38/47) × (37/46) = 0.650, so the chance of hitting is 1 − 0.650 = 35.0%. The rule of 4 estimate is 9 × 4 = 36%. On the turn the same draw hits 9 / 46 = 19.6% of the time (rule of 2: 18%). Enter your outs and stage, and compare the percentage with the pot odds you are 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 of the exact figures this calculator gives (35.0% and 19.6% for 9 outs); it is accurate within a few percentage points for up to about 12 outs.
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.