Sports Betting Calculators

Seven free calculators for the math behind a bet: convert odds, strip out the vig, price a parlay, and test a bet’s break-even rate, expected value and Kelly stake. Everything runs in your browser and nothing you type is saved.

CalculatorOdds converterAny odds format to any other, with the implied probability.CalculatorNo-vig fair odds calculatorTake the vig out of a two-way or three-way market.CalculatorParlay calculatorCombined odds, payout and implied probability for 2 to 10 legs.CalculatorHold and vig calculatorThe margin built into any two-way or three-way market.CalculatorBreak-even win rate calculatorThe win rate any price needs just to break even.CalculatorKelly criterion calculatorFull and fractional Kelly stake from your edge and the price.CalculatorExpected value (EV) calculatorAverage profit of a bet from your win probability and the price.

How to use them

Odds are just a price. These tools turn a price into a probability, show how much of it is the sportsbook’s margin, and let you compare it with your own estimate. Pair them with the odds board to find the best price and with prop hit rates to ground your numbers in real game logs. New to the terms? See the glossary and the American odds guide.

These calculators are educational. They are not betting advice, and Livdy is research, not a sportsbook. 21+ where legal; if gambling is a problem, call 1-800-GAMBLER or see responsible gambling.

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