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.

Calculate payout and profit from any odds. Enter stake plus American, decimal, or fractional odds and see total return, profit, and implied probability instantly.

Convert odds between American, decimal, fractional, implied probability, Indonesian, Hong Kong, and Malay formats. Same probability, seven different displays.

Convert decimal odds to American odds (moneyline format) instantly. Includes conversion formula and reference table for common decimal values.

Convert American odds (moneyline) to decimal odds instantly. Includes conversion formula and reference table for common moneyline values.

Convert decimal odds to fractional (UK / horse-racing format) instantly. Includes formula and reference table for common decimal values.

Convert fractional (UK) odds to decimal instantly. Includes formula and reference table for common fractional values.

Convert American (moneyline) odds to fractional (UK) format instantly. Includes formula and reference table for common moneyline values.

Convert fractional (UK) odds to American (moneyline) format instantly. Includes formula and reference table for common fractional values.

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.

Calculate lay stakes and guaranteed profit for UK matched betting. Use free bets and bookmaker offers risk-free with the back-and-lay formula.

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. Essential for soccer, hockey, baseball, and player props.

Calculate all parlay combinations, payouts, and profits for round robin bets. See every 2-pick, 3-pick, and multi-pick parlay from your selections.

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, and compare effective odds across platforms.

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

Calculate your federal and state tax liability on gambling winnings

Calculate Lucky 15 returns: 4 selections, 15 bets (singles, doubles, trebles, four-fold). Includes optional UK bookmaker bonuses.

Calculate Lucky 31 returns: 5 selections, 31 bets (singles, doubles, trebles, four-folds, five-fold). Optional UK bookmaker bonuses.

Calculate Lucky 63 returns: 6 selections, 63 bets (singles, doubles, trebles, four-folds, five-folds, six-fold). Includes optional UK bookmaker bonuses.

Calculate Patent returns: 3 selections, 7 bets (3 singles, 3 doubles, 1 treble). Full UK full-cover bet calculator with one-winner returns.

Calculate Trixie returns: 3 selections, 4 bets (3 doubles plus 1 treble). Needs at least 2 winners for a return.

Calculate Yankee returns: 4 selections, 11 bets (6 doubles, 4 trebles, 1 four-fold). Needs at least 2 winners for a return.

Calculate Heinz returns: 6 selections, 57 bets (15 doubles, 20 trebles, 15 four-folds, 6 five-folds, 1 six-fold). No singles, no safety net.

Calculate Super Heinz returns: 7 selections, 120 bets across doubles through seven-fold. Larger sibling of the Heinz.

Calculate Goliath returns: 8 selections, 247 bets. The largest mainstream UK system bet. No singles, every double through eight-fold.

Calculate each-way returns at 1/4, 1/5, 1/3, or 1/2 place terms. Set places paid, mark wins and places, see total stake and payout instantly.