Gambling Calc — Free Gambling, Betting & Casino Calculators
Find the gambling calculator for your bet or game: payouts and odds, casino RTP and house edge, blackjack decisions, poker equity, lottery and racing tickets. Search by game or bet type, or work out the RTP of your own play right here.
- Free, no account
- Formula shown on every page
Casino RTP calculator
Enter what you wagered and what came back, in the same currency, to get the return percentage of your recorded play.
What should I enter?
Wagered is every settled stake added together, including winnings you bet again. Returned is every payout, including stakes that came back with a win. Deposits, withdrawals and your balance are different figures. Use records from one period, without open bets or unrelated bonus credits.
To turn a published RTP into expected cost, use the RTP, house edge and theoretical loss tool. For blackjack rules, use the blackjack house edge calculator.
Popular gambling calculators
- Slot Bet & DenominationTurn credits and denomination into the cash cost of a spin.
- Craps PayoutsPayouts and true odds for every bet, with buy and lay commission.
- Keno OddsCatch probabilities for any pick, pool and draw size.
- Crazy TimeStakes and paytable scenarios for the money wheel.
- Blackjack StrategyHit, stand, double, split or surrender for your hand.
- Plinko ProbabilitySlot probabilities and returns for custom paytables.
- Crash CalculatorCashout targets and modeled session risk.
- Poker Risk of RuinBankroll risk from win rate and variance.
Find a gambling calculator by category
A selection from each section. The search above covers the whole site, and the A–Z list of all calculators has every tool on one page.
Betting Calculators
Odds formats, bookmaker margin, payouts, hedges and stake sizing.
- Odds Converter
- Parlay Calculator
- Arbitrage Calculator
- Kelly Criterion Calculator
- Hedging Calculator
- Football Calculators
- Correct Score Calculator
Casino Calculators
RTP and house edge, expected loss, bonus wagering, blackjack and roulette.
- RTP & House Edge Converter
- Bonus Wagering Calculator
- Blackjack Decision EV
- Blackjack House Edge
- Blackjack Payouts
- Blackjack Card Counting
- Roulette Odds Calculator
- Slot Session Simulator
- Bonus Buy EV Calculator
- Baccarat Payout & Commission
Table & Social Games
Payouts, commission and paytable probabilities for dice, keno and bingo.
- Sic Bo Odds & House Edge
- Craps House Edge
- Keno Payout Analyzer
- Bingo Odds Calculator
- Bingo Payout Calculator
Poker Math Tools
Equity, pot odds, ranges, push-fold decisions and variance.
All poker toolsFast Game Calculators
Probability and session risk for Mines, HiLo, Dice, Limbo and other instant games.
All fast game calculatorsCrypto Gambling Calculators
Crash-game probability, provably fair checks, coin conversion and rewards.
All crypto gambling calculatorsLottery & Jackpot Calculators
Payout options, tax, ticket odds and jackpot expected value.
- Lump Sum vs Annuity
- Lottery Tax Calculator
- Pick 3 / Pick 4 Odds
- Jackpot EV Analyzer
- Scratch Card EV Analyzer
- Lottery Wheel Generator
- Prize Pool Split
Horse Racing & Pool Calculators
Exotic tickets, combination costs and tote-pool payouts.
All horse racing calculatorsBankroll, Tax & Finance Tools
ROI, risk of ruin, compounding and tax on winnings.
- Gambling ROI Calculator
- Risk of Ruin Calculator
- Compound Interest Calculator
- US Gambling Tax Calculator
Recently updated calculators
How to choose the right calculator
- What does my bet pay? The odds converter handles a single bet in American, decimal or fractional odds; the parlay calculator combines several legs. Total return includes your stake, net profit does not.
- What will a bonus cost to clear? Enter the bonus, the playthrough and the game in the wagering calculator to get the turnover and its expected cost. To see how far a session can swing around that average, run the slot session simulator.
- How should I play this blackjack hand? Basic strategy gives the play for your cards and the dealer upcard. Decision EV shows how much each alternative gives up.
- How big a bankroll do I need? Poker players can put win rate and standard deviation into the risk of ruin calculator. Bettors with an estimated edge can size stakes with Kelly.
- How many tickets does my lottery or racing play need? The lottery wheel generator builds the number combinations. For ordered racing bets use exacta, trifecta or superfecta.
- Was that crash or dice round fair? Paste the revealed seeds into the provably fair verifier. It checks a finished round; it cannot show the next multiplier.
Gambling math guides
Short explanations of the numbers the calculators use.
How Gambling Calc works
Gambling Calc is a library of gambling calculators built and maintained by Jack Beaumont. Each tool answers one question (a payout, a probability, an expected value, a bankroll risk) and the page under it gives the formula, a worked example and the assumptions the result depends on.
More about the project is on the about page.
- One tool per question. Game rules and bet types that change the math get their own calculator.
- The math is shown. You can check a result by hand from the formula on the page.
- No predictions. Results are arithmetic on your inputs.
- Errors get fixed. If a number looks wrong, report it with the inputs you used.
Some pages carry commercial links; see the affiliate disclosure.
Frequently asked questions
What is a gambling calculator?
A gambling calculator turns inputs such as stake, odds, a paytable or a bankroll into one specific number: a payout, an implied probability, an RTP, an expected value, a ticket cost or a risk of ruin. Each of these measures something different, which is why Gambling Calc has a separate tool for each question.
How do I calculate actual casino RTP?
Divide the total payouts returned by the total amount wagered over the same settled bets, then multiply by 100. For example, 965 returned from 1,000 wagered is 96.50% recorded RTP and a net result of −35. Count every stake, including winnings you bet again; a deposit is not turnover.
Is my recorded RTP the same as the game's RTP?
No. The published or theoretical RTP is the long-run average built into the game. Your recorded RTP is the result of one sample of play and can sit far above or below it, especially over a few hundred rounds or on a high-volatility slot.
Can recorded RTP be above 100%?
Yes. Getting 1,100 back from 1,000 wagered is 110% recorded RTP and a profit of 100. It describes a winning sample and says nothing about the next session.
Are the calculators free?
Yes. Every calculator on Gambling Calc is free and works without an account, a deposit or a link to a casino or sportsbook login.
Can a calculator predict results or guarantee a profit?
No. The calculators do arithmetic on the numbers you enter. They cannot tell you the next spin, card, ball or multiplier, and correct math does not turn a negative expected value into a positive one.
RTP formula reference: UK Gambling Commission: calculating return to player.
18+ only. Set a spending and time limit before you play; the responsible gambling tools help with budgets and limits.