Professional betting tools for sports bettors and poker players. Calculate odds, find value, and manage your bankroll with our free, privacy-focused calculators.
Every gambling calculator on this page is built on probability theory and expected value mathematics. Understanding these concepts is the difference between gambling and informed decision-making. The house always has an edge in casino games — these tools help you understand exactly how large that edge is and whether a particular bet offers value.
For sports bettors: Start with the Odds Converter to understand your odds in any format, then use the Expected Value Calculator to determine if a bet is +EV (profitable long-term). The Kelly Criterion then tells you how much to stake.
For poker players: Begin with Pot Odds and Equity Calculators to make mathematically correct decisions at the table. Advanced players can explore ICM for tournament strategy.
For casino game analysis: Use our house edge and odds calculators to understand exactly what you're paying to play. Every casino game has a mathematically defined house edge — knowing it helps you make informed choices about which games to play and which bets to avoid.
These calculators are educational tools for understanding probability and expected value. They do not guarantee winning outcomes. Never bet more than you can afford to lose. If you or someone you know has a gambling problem, call the National Problem Gambling Helpline at 1-800-522-4700.
Essential tools for sports bettors to analyze odds, calculate payouts, and find value
Convert between American, Decimal, and Fractional odds formats instantly.
Calculate combined odds and potential payouts for multi-leg parlays.
Find arbitrage opportunities and calculate optimal stake distribution.
Calculate hedge stakes to lock in profit or minimize loss.
Convert betting odds to win probability percentage.
Calculate sportsbook margin and no-vig fair odds.
Calculate teaser bet payouts with adjusted point spreads.
Build and calculate all parlay combinations from your selections.
Calculate if bet and reverse action bet outcomes.
Find middling opportunities between two spread positions.
Calculate arbitrage stakes across multiple bookmakers.
Calculate optimal stakes for multiple selections to guarantee equal profit.
Professional tools for betting exchanges and matched betting strategies
Calculate lay bet liability and profit for betting exchanges.
Calculate optimal lay stakes for matched betting.
Complete matched betting calculator for bonus extraction.
Calculate optimal lay stakes for Stake Not Returned free bets.
Calculate optimal lay stakes for Stake Returned free bets.
Calculate exchange commission, effective odds, and net profit.
Professional tools to manage your betting bankroll and maximize long-term profits
Calculate whether a bet has positive or negative expected value.
Calculate optimal bet size based on your edge and bankroll.
Track whether your bets beat the closing line over time.
Calculate pot odds, equity, and make better decisions at the poker table
Calculate pot odds and determine if a call is profitable.
Calculate hand vs hand equity in Texas Hold'em.
Calculate implied odds including expected future betting.
Count outs and calculate draw probabilities.
Calculate expected value for any poker decision.
Calculate stack-to-pot ratio for postflop decisions.
Calculate fold equity and semi-bluff profitability.
Visualize and analyze poker hand ranges.
Calculate reverse implied odds for drawing hands.
Calculate hand combinations and blockers.
Analyze blocker effects on opponent ranges.
Calculate optimal 3-bet sizing and ranges.
ICM, push/fold, and tournament-specific calculations
Calculate your M-ratio and tournament stack zone.
Calculate Independent Chip Model equity.
Optimal push/fold ranges for short stacks.
Calculate expected value for all-in decisions.
Calculate prize pool distribution.
Tournament blind structure and timer.
Calculate tournament starting chip distributions.
Plan chip denominations for home games.
Track your results, manage your bankroll, and understand variance
Calculate return on investment for tournaments.
Calculate your poker hourly win rate.
Understand poker variance and swings.
Calculate probability of experiencing downswings.
Calculate proper bankroll for your stakes.
Calculate probability of going broke.
Calculate rakeback value and VIP rewards.
Log and analyze your poker sessions.
Track sessions and visualize bankroll swings, variance, and momentum.
Calculators for Omaha, Short Deck, Stud, and other poker variants
Advanced Hold'em odds with outs and draws.
Calculate PLO odds and draws.
Calculate split pot equity in O8.
Calculate 6+ Hold'em odds and probabilities.
Calculate odds in multi-player pots.
Calculate odds with dead card tracking.
Calculate Open Face Chinese poker scores.
Basic strategy, card counting, and house edge calculators for blackjack players
Generate optimal blackjack strategy based on rule variations.
Interactive blackjack strategy chart for all hand combinations.
Calculate house edge based on rule variations and deck count.
Calculate expected value for blackjack hands and sessions.
Learn card counting systems and calculate true count.
Practice Hi-Lo card counting with interactive drills.
Convert running count to true count with deck estimation.
Calculate probability of losing your bankroll in blackjack.
Calculate optimal betting units based on bankroll and risk.
Calculate expected value of insurance bets in blackjack.
Analyze house edge for Perfect Pairs, 21+3, and other side bets.
Calculate standard deviation and variance for blackjack sessions.
Determine required bankroll for blackjack sessions.
Calculate when surrender is the optimal play.
Advanced strategy based on exact card composition.
Optimal strategy for Blackjack Switch variant.
Optimal strategy for Spanish 21 with bonus payouts.
Calculate odds and strategy for British Pontoon.
Strategy for Double Exposure with both dealer cards visible.
Odds, payouts, and betting system simulators for roulette players
Calculate probabilities for all roulette bet types.
Calculate payouts for inside and outside roulette bets.
Compare house edge for American, European, and French roulette.
Calculate expected value for roulette betting sessions.
Simulate Martingale, Fibonacci, and other betting systems.
Calculate probability of various roulette outcomes.
Calculate probability of losing your session bankroll.
Analyze sector and neighbor bets on the wheel.
Calculate coverage and payouts for neighbors bets.
Calculate Voisins, Orphelins, and Tiers du Cylindre.
Odds, payouts, and expected value calculators for craps players
Calculate probabilities and odds for all craps bets.
Calculate payouts for pass line, place, and proposition bets.
Compare house edge across all craps bet types.
Calculate expected loss for craps sessions.
Analyze pass line and come bet probabilities.
Calculate true odds payouts for odds bets.
Analyze don't pass and don't come bet probabilities.
Calculate place bet payouts and house edge.
Calculate buy bet payouts with commission.
Calculate lay bet payouts and liability.
Analyze field bet probabilities and payouts.
Calculate standard deviation for craps sessions.
Determine required bankroll for craps sessions.
Calculate proposition bet payouts and house edge.
Calculate hop bet payouts for specific dice combinations.
Calculate horn and whirl bet payouts.
Calculate fire bet probabilities and payouts.
Odds, house edge, and expected value calculators for baccarat
Calculate probabilities for banker, player, and tie bets.
Compare house edge with different commission rates.
Calculate expected value for baccarat sessions.
Calculate banker bet commission and net payouts.
Analyze tie bet probabilities and expected value.
Calculate pair bet probabilities and payouts.
Calculate Dragon Bonus side bet payouts.
Analyze all baccarat side bet options.
Learn baccarat card counting techniques.
Calculate odds for commission-free EZ Baccarat.
Strategy, odds, and pay table analyzers for video poker
Calculate hand probabilities and expected returns.
Learn optimal Jacks or Better video poker strategy.
Calculate expected value for video poker sessions.
Analyze and compare video poker pay tables.
Learn optimal Deuces Wild video poker strategy.
Optimal strategy for Double Bonus Poker.
Optimal strategy for Joker Poker variants.
Calculate variance and standard deviation for video poker.
Determine required bankroll for video poker sessions.
Exotic bet calculators, odds conversion, and analytics tools for horse racing handicappers
Calculate exacta bet costs and payouts for box, straight, and key bets.
Calculate trifecta bet costs and combinations for all bet types.
Calculate superfecta bet costs for box, straight, and key bets.
Calculate quinella bet costs where order doesn't matter.
Calculate each-way bet returns for UK/Irish horse racing.
Convert between fractional, decimal, and American odds.
Calculate the cost of boxing multiple horses in exotic bets.
Calculate daily double bet costs and combinations.
Calculate multi-race pick bet costs and combinations.
Calculate costs for key bets in exacta, trifecta, and superfecta.
Calculate wheel and part-wheel bet costs.
Calculate partial wheel bets with different horses per position.
Estimate place bet payouts based on win odds.
Estimate show bet payouts and compare WPS returns.
Calculate stakes for multiple selections to guarantee equal profit.
Calculate and compare horse racing speed figures.
Convert speed figures between Beyer, Timeform, and other scales.
Calculate track takeout and effective returns by jurisdiction.
Calculate pari-mutuel breakage costs for dime and nickel breakage.
Calculate pari-mutuel payoffs based on pool size and takeout.
Compare morning line odds to actual tote board odds.
Track your horse racing betting ROI and win rates.
Track and analyze trainer and jockey statistics.
Calculate optimal bet sizing and bankroll management.
Calculate lottery odds, expected value, and analyze jackpot payouts
Calculate the odds of winning any lottery game.
Calculate expected value for lottery tickets.
Calculate Powerball odds for all prize tiers.
Calculate Mega Millions odds and expected value.
Compare lottery annuity vs lump sum payouts.
Calculate lottery winnings after taxes.
Calculate expected value for scratch-off tickets.
Track ROI for scratch-off purchases.
Generate random lottery number combinations.
Calculate odds for various state lottery games.
Calculate EuroMillions odds and expected value.
Calculate UK National Lottery odds.
Calculate odds for Pick lottery games.
Calculate share amounts for pool participants.
Generate lottery wheeling systems.
Analyze lottery number frequency patterns.
Calculate odds of winning a raffle.
Optimize lineups, track ROI, and analyze DFS contests
Calculate points per dollar for player analysis.
Generate optimal DFS lineups within salary cap.
Calculate ownership leverage for contrarian plays.
Calculate player projection ranges.
Track and calculate your DFS return on investment.
Calculate optimal bankroll allocation for DFS.
Analyze and select optimal DFS contests.
Compare EV between GPPs and cash games.
Calculate player correlations for stacking.
Build and analyze DFS player stacks.
Calculate minimum cash rate for profitability.
NFL-specific points per dollar calculator.
NBA-specific points per dollar calculator.
MLB-specific points per dollar calculator.
NHL-specific points per dollar calculator.
PGA-specific value calculator for golfers.
Calculate value for soccer DFS players.
All calculations happen in your browser. Your data never leaves your device.
Accurate calculations used by sharp bettors and professional gamblers.
Use our tools anywhere, on any device. Perfect for quick calculations.
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Our gambling calculators help you make smarter betting decisions. Convert odds between American, Decimal, and Fractional formats, calculate parlay payouts, find arbitrage opportunities, determine expected value, and optimize your bankroll with the Kelly Criterion. All tools are free, require no sign-up, and run entirely in your browser for complete privacy.
The best odds format depends on your region and preference. American odds (+150, -200) are popular in the US, decimal odds (2.50, 1.50) are used worldwide and easiest to calculate payouts, while fractional odds (3/2, 1/2) are traditional in the UK. Our Odds Converter makes it easy to switch between formats.
Parlay odds are calculated by converting all odds to decimal format and multiplying them together. For example, a 2-leg parlay at -110 (1.91) and +150 (2.50) equals 1.91 × 2.50 = 4.775 decimal odds, or approximately +378 American odds. Our Parlay Calculator does this automatically.
Expected Value (EV) measures the average return you can expect from a bet over time. A positive EV (+EV) bet is profitable long-term, while negative EV (-EV) bets lose money. The formula is: EV = (Win Probability × Profit) - (Loss Probability × Stake). Professional bettors focus on finding +EV opportunities.
The Kelly Criterion is a mathematical formula for optimal bet sizing that maximizes long-term bankroll growth. It calculates what percentage of your bankroll to wager based on your edge and odds. Many professional bettors use "half Kelly" or "quarter Kelly" for reduced variance.
Arbitrage opportunities exist when the combined implied probability across all outcomes is less than 100%. This happens when different sportsbooks have different odds on the same event. Our Arbitrage Calculator helps identify these opportunities and calculates the optimal stake for each outcome.
Closing Line Value measures whether you consistently beat the closing line (the final odds before an event starts). Positive CLV indicates you're getting better odds than the market settles at, which correlates strongly with long-term profitability. Sharp bettors track CLV to evaluate their betting skill.
Matched betting is a technique that uses free bets and bonuses from bookmakers to guarantee a profit. You place a back bet at a bookmaker and a lay bet at an exchange to cover all outcomes. The free bet or bonus provides the profit. Our Matched Betting Calculator handles the math for qualifying bets and free bet extraction.
SNR (Stake Not Returned) free bets only pay out the winnings if you win - the stake is not included in the return. SR (Stake Returned) free bets pay out both the stake and winnings if you win, making them more valuable. SR free bets typically retain 90-95% of value vs 70-85% for SNR. Always check your free bet terms to use the correct calculator.
A lay bet means betting against an outcome on a betting exchange. You act as the bookmaker, accepting someone else's back bet. If the selection loses, you win the stake minus commission. If it wins, you pay the liability. Lay bets are essential for matched betting and hedging strategies.