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Implied Probability
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Profit on Stake
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Total Return
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Bookmaker Margin
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💡 Implied probability is the percentage chance the bookmaker believes this outcome has. If you think the true probability is higher, you have a value bet.
🎯 Parlay / Accumulator Calculator
Add each leg's odds, choose your stake, and see your combined payout. Supports all odds formats.
Legs
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Combined Odds
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Potential Profit
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Total Return
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Implied Probability
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💡 Each additional leg multiplies the odds — and multiplies the difficulty of winning. A 5-leg parlay where each leg has 50% chance has only a 3.1% chance of winning.
📊 Expected Value (EV) Calculator
Find out if a bet has positive or negative expected value. A +EV bet is profitable in the long run.
Expected Value
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EV per unit staked
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Book's implied prob.
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Your edge
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💡 How to use this: estimate the true probability of an outcome (e.g. from your own research or a sharp market), enter the decimal odds being offered, and see if you have an edge. If EV is positive, the bet is mathematically profitable long-term.
🏠 House Edge by Game
The house edge is the mathematical advantage the casino holds over the player. Lower is better for you.
Game
House Edge
RTP
Category
Edge Visual
💡 RTP (Return to Player) is 100% minus the house edge. A game with a 0.5% edge returns €99.50 for every €100 wagered on average. Slots RTP varies widely — always check the game's info page for the exact figure.
Sources & Methodology
House EdgeBlackjack basic strategy house edge (0.50%): Michael Shackleford, "Wizard of Odds", Appendix 4 — verified against Stanford Wong, "Professional Blackjack". — wizardofodds.com
House EdgeBaccarat edge (Banker 1.06%, Player 1.24%, Tie 14.36%): Wizard of Odds, Baccarat section. Consistent across all published casino mathematics references. — wizardofodds.com
House EdgeEuropean Roulette (2.70%) and French Roulette with La Partage rule (1.35%): Standard probability calculation on 37-pocket wheel; confirmed by UKGC gaming guidance. — www.gamblingcommission.gov.uk
House EdgeAmerican Roulette (5.26%) on 38-pocket wheel: standard calculation confirmed by Nevada Gaming Control Board publications. — gaming.nv.gov
House EdgeCraps pass/come (1.41%) and don't pass/come (1.36%): Wizard of Odds, Craps section. Based on standard casino rules. — wizardofodds.com
House EdgeVideo Poker — Jacks or Better 9/6 paytable (0.46% house edge): Wizard of Odds, Video Poker strategy calculator. — wizardofodds.com
RTP SlotsOnline slots average RTP (94–97%): Malta Gaming Authority published quarterly compliance reports; UKGC "Gambling Industry Statistics 2023–24". — www.mga.org.mt
MethodologyAll house edge figures assume optimal or basic strategy play where applicable. Actual results vary. House edge is a long-run mathematical expectation, not a per-session guarantee.