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Betting calculators.
The math Big Mike’s engine runs on every line, as free tools. No sign-up, no tracking of what you punch in.
Odds converter · Try itEvery price is a probability wearing a costume.
Decimal1.909
Fractional · approx91/100
Implied probability · break-even52.4%You need to win 52.4% of the time at this price just to break even.
The app strips the vig on every game on the board, so the fair number is already there next to every price.All calculators
Odds ConverterAmerican to decimal to implied probability, instantly. The implied number is the one that matters: it's the win rate you need just to break even.Open ›Parlay CalculatorEnter each leg, get the combined odds and payout. Then look at what the combined implied probability says about your chances.Open ›EV CalculatorThe only number that matters long-term. Enter the price and your true win probability; the calculator tells you who has the edge.Open ›Kelly CalculatorHow much to bet when you have an edge. Full Kelly maximizes long-run growth; almost everyone should bet a fraction of it.Open ›Hedge CalculatorYour futures ticket is live and the other side is priced. This tells you the exact stake that locks the same profit whichever way it lands.Open ›Hold CalculatorEnter both sides of a market and see the book's cut — plus what the fair, no-vig price would be. This is the math Big Mike runs on every line.Open ›Closing Line ValueThe result of one bet tells you almost nothing. The price you got against the price the market closed at tells you whether the bet was any good, before the ball is even thrown.Open ›
GET BIG MIKEBig Mike runs this math on every line, then shows you the ones worth taking.
His whole board live, your bets graded against the close, and the best number on every play. 61.5% on the moneyline board · 808 picks graded in public.