Betting Calculators

Free tools for odds conversion, parlay payouts, vig analysis, and more.

Odds Converter

Convert between American, Decimal, Fractional, and Implied Probability.

Calculate combined odds and payout for multi-leg parlays.

Calculate the bookmaker's vig from a two-way market.

Remove the vig to find true fair odds for each side.

Calculate EV per dollar wagered given your true probability.

Calculate optimal bet sizing based on your edge and bankroll.

Convert odds to implied probability with payout calculator.

Calculate bookmaker hold for multi-outcome markets.

Find arb opportunities and calculate guaranteed profit.