Betting Calculators & Tools

Free tools to help you calculate odds, expected value, and optimal bet sizing.

Odds Converter

Convert American, Decimal, and Fractional odds. Calculate implied probability and payouts.

Calculate EV to find profitable bets. Enter your probability estimate and odds.

Calculate combined parlay odds and see the true probability of hitting.

Optimal bet sizing based on your edge. Full Kelly and fractional options.

Lock in profit or cut losses on existing bets. Calculate optimal hedge amounts.

Calculate the bookmaker's margin on any market. Compare vig across books.

Find guaranteed profit opportunities across different sportsbooks.

Monte Carlo simulation: see how your edge plays out over 1000+ bets.