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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.
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.