Betting Calculators

Calculate recommended bet sizes, payouts, profit, and ROI for your arbitrage bets.

Find your optimal betting unit size based on your bankroll and risk profile.

Find your optimal betting unit size based on your bankroll and risk profile.

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

Use our CLV calculator to see what value you got and your estimated expected value.

Calculate the expected value (EV) of a bet to determine if it has positive long-term value.

Convert your free bets and bonus bets into guaranteed profit by calculating the optimal hedge bet amount.

Calculate the optimal hedge bet amount to guarantee profit or minimize losses.

Calculate a sportsbook's hold percentage, the expected revenue it keeps, from the odds on a market.

Calculate a sportsbook's hold percentage, the expected revenue it keeps, from the odds on a market.

Calculate implied probability from betting odds in any format.

Calculate optimal bet size using the Kelly Criterion for bankroll management.

Calculate the win-win window and worst-case outcome for a middle bet across two sportsbooks.

Calculate the win-win window and worst-case outcome for a middle bet across two sportsbooks.

Remove the vig from betting lines to find true odds and implied probabilities.

Calculate how much you would win and profit based on bet amount and odds in any format.

Calculate parlay odds and potential payout for multiple bets with unlimited legs.

Convert point spreads to moneyline odds for NFL, NBA, NCAAF, and NCAAB.

Calculate how much extra profit a sportsbook profit boost token adds to your bet.

Calculate how much extra profit a sportsbook profit boost token adds to your bet.

Calculate payouts and profit for round robin parlays with unlimited legs.

Estimate the federal and state tax owed on your sports betting winnings and other gambling income.

Estimate the federal and state tax owed on your sports betting winnings and other gambling income.

Calculate the payout for your NFL or NBA teaser bet based on points teased and number of picks.

Calculate the payout for your NFL or NBA teaser bet based on points teased and number of picks.

Calculate the sportsbook vig on any betting market with unlimited outcomes.

Crypto.com Fee Calculator

Calculate the fees you would pay when trading prediction market event contracts on Crypto.com.

Crypto.com Fee Calculator

Calculate the fees you would pay when trading prediction market event contracts on Crypto.com.

DraftKings Predict Fee Calculator

Calculate the fees you would pay when trading event contracts on DraftKings Predict.

DraftKings Predict Fee Calculator

Calculate the fees you would pay when trading event contracts on DraftKings Predict.

Fanatics Markets Fee Calculator

Calculate the fees you would pay when trading event contracts on Fanatics Markets.

Fanatics Markets Fee Calculator

Calculate the fees you would pay when trading event contracts on Fanatics Markets.

FanDuel Predicts Fee Calculator

Calculate the 2% payout fee you would pay on a winning prediction on FanDuel Predicts. No fee applies if you lose.

FanDuel Predicts Fee Calculator

Calculate the 2% payout fee you would pay on a winning prediction on FanDuel Predicts. No fee applies if you lose.

Kalshi Combo Calculator

Estimate the combined price and payout for a Kalshi Combo (parlay-style multi-trade contract), assuming independent trades.

Kalshi Combo Calculator

Estimate the combined price and payout for a Kalshi Combo (parlay-style multi-leg contract), assuming independent legs.

Kalshi Fee Calculator

Calculate the fees you would pay when betting on Kalshi prediction markets.

Kalshi Odds Converter

Convert Kalshi contract prices to American, Decimal, and Fractional odds instantly.

Kalshi Odds Converter

Convert Kalshi contract prices to American, Decimal, and Fractional odds instantly.

Kalshi Payout Calculator

Calculate your exact payout, profit, and ROI for Kalshi contracts. Supports maker and taker fees.

OG.com Fee Calculator

Calculate the fees you would pay when opening or closing positions on OG.com.

Polymarket Combo Calculator

Estimate the combined price and payout for a Polymarket Combo (parlay-style multi-trade contract), assuming independent trades.

Polymarket Combo Calculator

Estimate the combined price and payout for a Polymarket Combo (parlay-style multi-leg contract), assuming independent legs.

Polymarket Fee Calculator

Calculate the fees you pay as a taker or the rebate you receive as a maker when trading on Polymarket.

Polymarket Odds Converter

Convert Polymarket contract prices to American, Decimal, and Fractional odds instantly.

Polymarket Odds Converter

Convert Polymarket contract prices to American, Decimal, and Fractional odds instantly.

Polymarket Payout Calculator

Calculate your exact payout, profit, and ROI for Polymarket contracts. Supports taker fees and maker rebates.

Calculate payout, profit, and ROI for Kalshi, OG.com, or Robinhood contracts with accurate platform fees.

Convert prediction market prices to betting odds. See equivalent American odds and implied probability.

Robinhood Fee Calculator

Calculate the fees you would pay when opening or closing event contract positions on Robinhood.

Robinhood Payout Calculator

Calculate your exact payout, profit, and ROI for Robinhood event contracts. Supports Standard and Gold account fees.

Robinhood Payout Calculator

Calculate your exact payout, profit, and ROI for Robinhood event contracts. Supports Standard and Gold account fees.

Underdog Predicts Fee Calculator

Calculate the fees you would pay when trading event contracts on Underdog Predicts.

Underdog Predicts Fee Calculator

Calculate the fees you would pay when trading event contracts on Underdog Predicts.