Sports betting calculators

Convert odds, price parlays, strip juice, and size hedges with tested formulas. These tools do not place bets and do not predict winners.

Core tools

• Odds ConverterConvert American, decimal, fractional, and implied probability.
• Bet Payout CalculatorProfit and total payout from stake and American odds.
• Parlay CalculatorCombine American legs into one payout.
• No-Vig / Fair OddsRemove hold from a two-way market.
• Hedge CalculatorSize a hedge to lock a result.

Advanced tools

• Kelly CriterionBankroll fraction from odds and estimated win rate.
• Arbitrage CalculatorTwo-way dutch/arb stakes across prices.
• Bonus Bet ConverterEstimate profit if a free bet’s stake is not returned.
• Vig / Hold CalculatorOverround and hold from a full market.
• Closing Line ValueCompare your price to the close.
• Middle CalculatorSee whether two spreads can both win.
• Round Robin CombinationsCount parlays in an n-choose-r round robin.

Betting involves risk. Never wager money you cannot afford to lose. Help: ncpgambling.org.