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Betting calculators

Size every bet, evaluate every price, convert every format. The same maths sharps run — built into clean, instant tools.

%Implied ProbabilityConvert odds to win percentageEVExpected ValueIs this bet profitable long-term?KKelly CriterionOptimal bet sizing for your edgePParlayMulti-leg bet returns⇄Odds ConverterAmerican, decimal & fractionalVVig / JuiceFind the bookmaker's marginHHedgeLock in guaranteed profit📈Bankroll GrowthProject long-term profitability

Expected Value Calculator

Work out whether a bet is profitable long-term, given your own estimate of the win probability.

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What is ?

EV is the average profit or loss you'd expect if you placed the same bet thousands of times. Positive EV bets make money over the long run; negative EV bets bleed it.

The only number that matters

You can lose a +EV bet and win a −EV bet — is real. But over a large sample, only your over the probability decides whether you profit.

Why EV matters more than wins

Professional bettors don't chase wins — they chase +EV bets. A bet can lose and still have been the correct decision if it was +EV. Over hundreds of bets, consistently finding +EV opportunities is what separates profitable bettors from recreational ones.