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All tools, free and in your browser

Calculators, trainers and simulators for betting and casino maths. No account, no sign-up, and nothing you type leaves your browser.

Every tool shows the formula behind its number and where that formula comes from. Built by Alexander Korsager, with a corrections policy for when one turns out to be wrong.

Top 10 most searched

  1. Probability1. Roulette Strategy Simulator Run Martingale, D'Alembert, Fibonacci, Paroli or Labouchère over many sessions, watch what happens.
  2. Bankroll2. Risk of Ruin Calculator The chance a bankroll gets wiped out, from your edge, your swings and how many units you hold.
  3. Bankroll3. Bankroll Calculator Turn your bankroll and unit size into a flat stake, and see what a long losing run leaves of it.
  4. Odds4. Parlay Calculator Combine each leg's odds into one price and payout, and fair odds showing how the margin compounds.
  5. Games5. Expected Value Calculator Odds plus your true probability, as expected value per bet.
  6. Odds6. Hedge & Cash-Out Calculator The stake that locks in equal profit either way a bet lands, and whether the cash-out offer beats it.
  7. Probability7. Poker Hand Odds How often a Hold'em hand or range wins, ties and loses, against a hand, a range or any two cards.
  8. Games8. Blackjack Basic Strategy Trainer Set your table's rules, see the chart they produce and the cells that move, then drill it hand after hand.
  9. Games9. Poker Pot Odds Calculator Turn the pot, the bet and your outs into a call-or-fold answer, and drill the decision until it's instant.
  10. Reference10. Baccarat Odds & Commission The odds behind banker, player and tie, and how the commission decides which bet is best.

Just added

Odds

Convert a price between formats, take the margin out of a line, and see what a book is actually offering. Guide: Betting Odds Explained: Decimal, Fractional, American and Implied Probability

At the blackjack table

Bankroll

Stake sizing, how long a bankroll lasts, and what a wagering requirement costs to clear. Guide: Bankroll Management: Unit Sizing, Staking and Downswings

Around the roulette wheel

Wellbeing

A private self-check on your own relationship with gambling, and where to get free support.

The 10 most expensive bets in the casino

Compare all 41
  1. 27%house edge1. Keno casino keno ticket
  2. 19%house edge2. Big Six / Money Wheel average across symbols
  3. 17.64%house edge3. Blackjack Lucky Ladies, 6 decks
  4. 16.67%house edge4. Craps Any 7 (one-roll)
  5. 14.36%house edge5. Baccarat Tie (8:1)
  6. 10%house edge6. Slots tight penny machine
  7. 8.56%house edge7. Three Card Poker 6 Card Bonus, best schedule
  8. 7.89%house edge8. Roulette American five-number bet
  9. 7.69%house edge9. Roulette American triple-zero
  10. 7.61%house edge10. Baccarat Dragon 7 side bet

A trainer, not a calculator

Blackjack Basic Strategy Trainer

Set your table's rules, see the chart they produce and the cells that move, then drill it hand after hand.

Probability

Hand odds, expected value and variance, worked from the exact combinatorics rather than a rule of thumb. Guide: Expected Value in Betting: How to Know if a Bet Is Worth Making

At the track

Games

Trainers and simulators you play in the browser, with the maths shown as the hand or the spin resolves. Guide: Do Betting Systems Work? Martingale, D'Alembert and the Rest

For the sportsbook

Reference

Payout tables and house edges to look up, each with the arithmetic behind the figure. Guide: House Edge, RTP and What Casino Games Actually Cost You

At the poker table

Beyond the calculators

A number is only worth what is behind it.

Every tool here shows its formula and its source. The rest of the site is where that working is written out at length.

  • Guides

    The maths these calculators run, explained in order, from reading a price to deciding what to stake.

  • Original research

    Our own studies, with the method, the limitations and the dataset published alongside every figure.

  • Slot RTP reference

    Return-to-player figures as the studios publish them, read from their own game pages, dated and priced per $100 staked.

21+, and only where gambling is legal where you are. Working the numbers out correctly does not remove a house edge or turn a losing bet into a winning one, and gambling can cause serious harm. The National Problem Gambling Helpline is free, confidential and open 24/7: call or text 1-800-MY-RESET (1-800-697-3738), or chat at ncpgambling.org/chat. More on staying in control.

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