Texas Hold'em Odds Calculator — Free Preflop & Postflop Tool
Last updated: May 26, 2026
The RiverOdds Texas Hold'em calculator computes exact win probability, equity, and pot odds for any hand matchup — preflop or postflop. Enter your hole cards, add board cards, and get precise numbers instantly. No simulation, no signup, no download.
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Open RiverOdds Calculator →How the Texas Hold'em Odds Calculator Works
Most online odds calculators use Monte Carlo simulation — running millions of random board runouts to estimate equity. RiverOdds is different: it uses exact combinatorial enumeration. The calculator iterates over every possible remaining board combination and counts wins, losses, and ties with perfect precision.
For a typical preflop matchup (e.g., AA vs KK), there are C(50,5) = 2,118,760 possible five-card boards. The calculator evaluates all of them and reports exact percentages. On the flop with three board cards known, C(47,2) = 1,081 runouts remain — computed instantaneously. The result is 100% accurate, not an approximation.
Simulation vs Exact Combinatorics
Simulation
Samples random runouts — fast but introduces rounding error. Results vary slightly each run.
Exact Combinatorics (RiverOdds)
Evaluates every possible runout — perfectly accurate. AA vs KK is always exactly 82.36%, never an approximation.
Preflop Equity — Common Texas Hold'em Matchups
Preflop matchups fall into three categories: domination (one hand shares a card with the other, severely limiting its outs), coin flips (a pocket pair vs two overcards, roughly 53/47), and pair vs pair (a larger pair is a heavy favourite over 80% of the time).
Suitedness adds roughly 3% equity in most matchups — enough to matter over thousands of hands but rarely decisive in any single spot. The coin flip category (pocket pair vs two overcards) is one of the most misunderstood: the pair is actually a slight favourite, not a true 50/50.
Postflop Equity — Calculating Outs and Draws
Once board cards are known, equity shifts dramatically. Add your flop, turn, or river cards to the calculator to see updated win percentages at each street. This is the most powerful use of the tool for study: plug in a hand history and see exactly where you stood at every decision point.
Flush draw
9 outs
Flop: ~35% · Turn: ~20%
Open-ended straight
8 outs
Flop: ~32% · Turn: ~17%
Gutshot straight
4 outs
Flop: ~17% · Turn: ~9%
Combo draw (flush + OESD)
15 outs
Flop: ~54% · Turn: ~33%
The rule of 2 and 4 gives a quick approximation: multiply your outs by 4 on the flop (two cards to come) or by 2 on the turn (one card to come). The RiverOdds calculator gives you the exact figure without any mental arithmetic.
Pot Odds — Using the Calculator to Make Better Calls
Pot odds convert the bet size you face into a minimum equity threshold. If your equity exceeds the pot odds percentage, calling is profitable in the long run. The formula:
Pot Odds Formula
Pot Odds % = Call ÷ (Pot + Call)
If equity > pot odds %, the call is profitable (+EV). If equity < pot odds %, folding is correct (−EV).
How to Use the Texas Hold'em Odds Calculator
The calculator requires no account or installation. Follow these steps to get your hand equity in seconds:
- Step 1: Open the calculator at riverodds.app — the card selector loads immediately in your browser.
- Step 2: Select your hole cards. Click any two cards from the deck grid to assign them to your hand.
- Step 3: Select your opponent's hole cards or choose a hand range (e.g., all pocket pairs, AK+, suited connectors).
- Step 4: Add any community cards if you want postflop equity — enter flop, turn, or river cards, or leave blank for preflop.
- Step 5: Read your win %, equity %, and tie % in the output panel instantly — results update on every card selection.
To use pot odds: after entering your hand matchup, open the Pot Odds panel, enter the current pot size and the bet you face, and the calculator shows your required equity alongside your actual equity — making the call/fold decision automatic.
How to Study with an Odds Calculator
The calculator is most valuable as a study tool — not just a preflop lookup. Here are three workflows used by serious players:
Hand History Review
After each session, enter key hands from your history into the calculator. Find the exact equity you had at each decision point and compare it to the pot odds you faced. This reveals whether your calls and folds were mathematically correct.
Range vs Range Equity
Instead of assigning your opponent a specific hand, assign a range (e.g., all value hands on a given board). The calculator averages equity across the entire range, giving you a realistic picture of your equity against a population rather than a single hand.
Spot-Specific Study
Study specific spots systematically: enter a hand, add board cards, and vary the opponent's cards to see how your equity changes across different hand types. This builds intuition for how board texture affects equity.
Definitions
Frequently Asked Questions
What is a Texas Hold'em odds calculator?
A Texas Hold'em odds calculator is a tool that computes the win probability for any hand matchup. You enter your hole cards and your opponent's cards (or a range), add any community cards, and the calculator tells you your exact equity — the percentage of the pot you would win if the hand were played to showdown many times.
Is the RiverOdds calculator accurate?
Yes. RiverOdds uses exact combinatorial mathematics — not Monte Carlo simulation — to compute equity. Results are precise to multiple decimal places and match professional equity tools like Equilab and PokerStove. There is no rounding error from sampling.
What is equity in Texas Hold'em?
Equity is your percentage share of the pot based on your current win probability, assuming the hand runs to showdown. If you hold AA vs KK preflop, AA has 82.4% equity — it wins 82.4% of pots played to showdown across all possible runouts. Equity is a long-run expectation, not a guarantee for any single hand.
How do I calculate pot odds in Texas Hold'em?
Pot odds formula: Pot Odds % = Call Amount ÷ (Current Pot + Call Amount). Example: you face a $50 bet into a $100 pot. Your call is $50 into a total pot of $150 after calling. Pot odds = $50 ÷ $150 = 33.3%. You need at least 33.3% equity to make calling profitable in the long run.
Can I use this calculator for range vs range equity?
Yes. Instead of entering a specific hand for your opponent, use the range selector to assign a category of hands — for example 'all pocket pairs,' 'suited connectors,' or a custom range like JJ+, AKs. The calculator averages equity across all hands in that range weighted by their combinations.
What is the difference between outs and equity?
Outs are the number of specific unseen cards that will improve your hand — a flush draw has 9 outs. Equity is your overall win percentage across all possible remaining cards, accounting for every way you can win or lose. The rule of 2 and 4 converts outs to approximate equity: multiply outs by 4 on the flop or by 2 on the turn.
Is the calculator free to use?
Yes, completely free. The RiverOdds calculator is available at riverodds.app with no signup, no download, and no subscription required. It works on desktop, mobile, and tablet browsers.
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