14 free calculatorsNo sign-up
Free Sports Betting Calculators
Odds, expected value, vig, parlay, and bankroll calculators for sports bettors.
Free sports betting calculators
Convert odds, estimate expected value, compare market prices, and plan common wagers with these free sports betting calculators. Each calculator runs from the prices and assumptions you enter.
14 calculators
No calculators match that search. Try a different term.
Odds and probability
6 calculatorsSports Betting Odds Converter
Convert American odds to decimal odds, fractional odds, and implied probability.
Open calculator ProbabilitySports Betting Implied Probability Calculator
Convert American odds into implied win probability and decimal odds.
Open calculator Fair oddsNo-Vig Fair Odds Calculator
Remove the sportsbook margin from a two-way market to estimate fair odds.
Open calculator Market marginSports Betting Hold Calculator
Calculate the estimated hold and no-vig probabilities from both sides of a market.
Open calculator Market marginSports Betting Vig Calculator
Measure sportsbook juice from two prices and see the proportional no-vig odds.
Open calculator ProbabilityPoisson Distribution Sports Betting Calculator
Estimate exact, over, and under probabilities from an average event count.
Open calculatorWager planning
6 calculatorsExpected Value (EV) Sports Betting Calculator
Estimate a bet’s expected profit from your stake, price, and win probability.
Open calculator BankrollKelly Criterion Sports Betting Calculator
Estimate a bankroll fraction from your odds and your own win probability.
Open calculator ParlaysSports Betting Parlay Calculator
Calculate combined parlay odds, potential payout, and break-even probability.
Open calculator ParlaysRound Robin Betting Calculator
Count round robin combinations and estimate total cost and payout.
Open calculator Spreads & totalsPoint Spread Bet Calculator
Settle a point spread wager and calculate the profit or loss from the final score.
Open calculator Spreads & totalsHalf-Point Betting Calculator
Compare a spread or total before and after buying a half point.
Open calculatorArbitrage and promotions
2 calculatorsHow to use a sports betting calculator
Start with the exact price on your bet slip. American odds such as -110 and +150 convert to implied probabilities and decimal payouts. For expected value, add your own win-probability estimate; for no-vig odds, enter every outcome in the market. The calculators show the arithmetic from those inputs and do not fetch live sportsbook lines.
Use the relevant guide to understand each formula, its assumptions, and what the result can tell you. Prices can move, and settlement terms can differ between books.
Read the positive expected value betting guideFAQ
Frequently asked questions
What the calculators do, where the numbers come from, and how the odds math works.
What can a sports betting calculator calculate?
These calculators convert odds, estimate implied and no-vig probabilities, evaluate expected value, size selected stakes, and estimate payouts from user-entered numbers.
Do these betting calculators use live sportsbook odds?
No. Enter the current price from your sportsbook. The calculators perform the math locally and do not scan or refresh odds feeds.
How do American odds convert to implied probability?
For positive odds, divide 100 by the odds plus 100. For negative odds, divide the absolute odds by that number plus 100.