Free Tools · Betting Math
Betting calculators.
The same math the sportsbooks run, fair odds, edge, EV, and bet sizing, free and instant. No signup.
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IParlay CalculatorCombine multiple bets into one parlay and see the combined odds, total payout, and implied probability.Open→IIBet CalculatorEnter your odds and stake to see the exact payout, profit, and implied probability of a single bet.Open→IIIOdds ConverterConvert betting odds between American, decimal, and fractional formats, and see the implied probability.Open→IVExpected Value CalculatorEstimate the expected value of a bet from your win probability and the offered odds.Open→VNo-Vig Fair Odds CalculatorRemove the sportsbook's margin from a two-way market to get the fair odds and fair probability.Open→VIArbitrage CalculatorCheck whether two prices form an arbitrage and get the stake split for a positive return on every outcome.Open→VIIKelly Criterion CalculatorFind the bankroll-optimal stake from your win probability and the odds, with fractional-Kelly options.Open→
Courtside Lab6 experiments
Don't just calculate, simulate. Interactive experiments that show how betting math actually plays out over hundreds of bets.
Explore the Lab→Kelly Bankroll SimulatorRun your bankroll through hundreds of simulated bets and see why betting smaller usually survives longer.Open experiment→Long-Run Variance SimulatorPlace a winning bet hundreds of times and see how long a cold streak can last even when the math is on your side.Open experiment→Parlay Reality CheckBet a parlay over and over and see how rarely it really hits versus betting the legs one at a time.Open experiment→Odds Probability DialDrag a win-chance dial and watch all three odds formats move together in real time.Open experiment→The Vig DragSame picks, different prices: watch how always taking the worse number quietly drains a bankroll.Open experiment→Arbitrage Line MoverDrag two sportsbooks' prices and watch an arb open and close, with the stake split updating live.Open experiment→
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