Gambling & odds tools
The math behind every bet: odds, expected value, house edges and bankroll risk — shown with exact numbers, not hunches.
Most popular
Blackjack Strategy & EV Explorer
Exact basic strategy charts and EVs for your exact rules.
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Card Counting Trainer
Learn Hi-Lo card counting: speed drills, true-count quizzes and a bankroll simulator with your bet spread.
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Expected Value Calculator
EV, edge and break-even probability for a single bet.
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Hold'em Hand vs Range Equity
Exact all-in equity of a hand against a whole range.
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ICM & Deal Calculator
ICM equity per stack and a final-table deal vs chip chop.
popular
Kelly Criterion Calculator
Optimal stake size for a bet with an edge.
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Lottery Odds
Jackpot odds and every match tier of a k-of-N lottery.
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Martingale Simulator
Bust probability and true EV of doubling after losses.
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Odds Converter
Decimal, American, fractional, HK, Malay, Indonesian and implied probability.
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Omaha Odds Calculator
Win, tie and equity odds for Omaha hands and boards.
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Parlay Calculator
Combined odds, payout and true probability of accumulators.
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Poker Pot Odds & Outs
Equity from outs vs the pot odds of a call.
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Push/Fold Nash Charts (Heads-Up)
Nash jam and call ranges for 1–25 bb, on a live grid.
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Roulette Odds
Win probability, payout and house edge for every bet.
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Texas Hold'em Odds Calculator
Exact win, tie and equity odds for any hold'em matchup.
Betting Math
Expected Value Calculator
EV, edge and break-even probability for a single bet.
popular
Odds Converter
Decimal, American, fractional, HK, Malay, Indonesian and implied probability.
popular
Parlay Calculator
Combined odds, payout and true probability of accumulators.
Arbitrage Calculator
Stake split for a guaranteed profit across bookmakers.
Hedging Calculator
Lock in profit on an open bet, or convert a free bet.
Vig Remover
Overround, bookmaker margin and fair odds of a market.
Dutching Calculator
Spread one stake over several selections for equal profit.
Each-Way Bet Calculator
Returns for win, place and unplaced each-way outcomes.
Casino Games & Lottery
Blackjack Strategy & EV Explorer
Exact basic strategy charts and EVs for your exact rules.
popular
Card Counting Trainer
Learn Hi-Lo card counting: speed drills, true-count quizzes and a bankroll simulator with your bet spread.
popular
Lottery Odds
Jackpot odds and every match tier of a k-of-N lottery.
popular
Roulette Odds
Win probability, payout and house edge for every bet.
Blackjack House Edge
House edge from the exact table rules you are playing.
Craps Odds
Exact win probability and house edge for the main bets.
Expected Loss Calculator
The honest cost of a session at any casino game.
Slot Session Calculator
Expected loss and outcome spread of a slot session.
Poker
Hold'em Hand vs Range Equity
Exact all-in equity of a hand against a whole range.
popular
ICM & Deal Calculator
ICM equity per stack and a final-table deal vs chip chop.
popular
Omaha Odds Calculator
Win, tie and equity odds for Omaha hands and boards.
popular
Poker Pot Odds & Outs
Equity from outs vs the pot odds of a call.
popular
Push/Fold Nash Charts (Heads-Up)
Nash jam and call ranges for 1–25 bb, on a live grid.
popular
Texas Hold'em Odds Calculator
Exact win, tie and equity odds for any hold'em matchup.
Omaha Hi/Lo (Eight-or-Better) Odds Calculator
Split-pot equity for Omaha eight-or-better hands.
Razz Odds Calculator
Win, tie and equity odds for razz (seven-card stud low).
Seven-Card Stud Odds Calculator
Win, tie and equity odds for seven-card stud (high).
Stud Hi/Lo (Eight-or-Better) Odds Calculator
Split-pot equity for seven-card stud eight-or-better.
Bankroll & Risk
Kelly Criterion Calculator
Optimal stake size for a bet with an edge.
popular
Martingale Simulator
Bust probability and true EV of doubling after losses.
Risk of Ruin Calculator
Chance of losing the bankroll before hitting a target.
Streak Probability
Chance of long winning or losing streaks in n bets.
Bonus Wagering EV
What a casino bonus is worth after the rollover.
About these tools
Gambling math tools that show the numbers behind the games: odds and payout conversion, expected value, house edge by game, poker equities, blackjack strategy and bankroll or Kelly staking calculators. The goal is transparency — understanding why the house wins in the long run, not promising a way to beat it.