Sports betting calculators
Free, no account needed. Each one shows the formula and a worked example. Or use them all on one page in tools.
No-vig calculatorFree no-vig calculator. Enter both sides' odds to strip out the sportsbook's cut and see the fair odds and fair win chance for each side.Vig calculatorFree vig (juice) calculator. Enter a market's odds to see the sportsbook's hold: how much of every dollar bet it keeps on average.Expected value (+EV) betting calculatorFree +EV betting calculator. Enter the book's odds and your fair odds to see the expected value of a bet, the return per $100 and a Kelly bet size.Kelly criterion calculatorFree Kelly criterion calculator for sports betting. Enter the odds and your fair odds to get the Kelly stake, with fractional Kelly options and a 5% cap.Arbitrage betting calculatorFree arbitrage (sure bet) calculator for 2-way and 3-way markets. Enter the best odds on each outcome to see if it's an arb, the stakes and the locked profit.Hedge bet calculatorFree hedge bet calculator. Enter your bet, its odds and the other side's odds now to see the hedge stake that locks the same result whoever wins.Bonus bet converterFree bonus bet (free bet) converter. Find the hedge that turns a sportsbook bonus bet into cash, usually 60% to 75% of its value, whoever wins.Profit boost calculatorFree profit boost (odds boost) calculator. See the boosted odds and the hedge that locks part of the boost's extra value as cash.Parlay calculatorFree parlay calculator. Enter each leg's odds to see the parlay's odds and payout, and how much more of every dollar the book keeps on a parlay.Kalshi fee calculatorFree Kalshi fee calculator. Enter a contract price and how many contracts to see the trading fee, the total cost and the real odds after the fee.Polymarket fee calculatorFree Polymarket fee calculator for US sports markets. Enter a share price and how many shares to see the fee, the total cost and the real odds after the fee.Odds converterFree odds converter. Convert American odds to decimal and fractional and see the implied probability. Type -110, +150, 2.50 or 5/2.Implied probability calculatorFree implied probability calculator. Turn American, decimal or fractional odds into the win chance they imply, and see why a book's chances add up to over 100%.