Free Betting Calculators

Calculate the expected profit or loss of any bet. Find +EV opportunities that are profitable long-term.

Determine optimal bet sizing based on your edge. Maximize bankroll growth while managing risk.

Find guaranteed profit opportunities across sportsbooks. Calculate stake distribution for surebets.

Remove the bookmaker's margin to find true fair odds. Essential for calculating accurate probabilities.

Convert between American, decimal, and fractional odds formats instantly. Essential for comparing lines across books.

Calculate parlay odds, payouts, and implied probabilities for multi-leg bets. See the true cost of parlays.

Convert sportsbook free bets into guaranteed cash by hedging. Calculate optimal hedge stakes and conversion rates.

Find middle opportunities where both bets can win. Calculate risk, reward, and optimal stakes for middles.

Lock in guaranteed profit on existing bets by hedging. Calculate the exact hedge stake and profit breakdown for any scenario.

Calculate over/under probabilities, exact score odds, and player prop lines using the Poisson distribution.

Calculate all parlay combinations, payouts, and profits for round robin bets.

Find the sportsbook vig, margin, and juice on any two-way market. See the true fair odds and compare hold across books.

Kalshi, Polymarket & PredictIt calculator. Convert contract prices to odds, calculate payouts after fees.

Betfair, Smarkets & more. Calculate back and lay bet payouts after exchange commission, effective odds, liability, and ROI.