Free Sports Betting Calculators

Sharpen your edge with free tools for odds conversion, expected value, bankroll sizing, arbitrage, and more. No sign-up required.

Odds & Markets

Convert between American, Decimal, and Fractional odds formats instantly.

Convert betting odds into the win probability they imply.

Calculate your profit and total return from any stake and odds.

Add legs and see combined parlay odds, implied probability, and payout.

Convert Polymarket / Kalshi contract prices (¢) into American, Decimal, and Fractional odds.

See how much juice the sportsbook is charging on a two-way market.

Remove the vig to get true fair odds using the multiplicative method.

Calculate expected value from your odds and estimated win probability.

Calculate the optimal bet size based on your edge and bankroll.

Calculate hedge stakes for guaranteed profit or equal payouts on both sides.

Calculate the guaranteed cash value of a free bet using the hedge method.

StatsBench does the math automatically across 15+ sportsbooks — prop predictions, cheatsheets, and first basket picks updated every 30 minutes.