No-Vig Fair Odds Calculator
Strips the bookmaker overround from a market to reveal the implied true probability — the benchmark for spotting value bets.
Method
Each outcome's implied probability is 1/odds. We divide each by the sum of all implied probabilities (the "overround") to renormalise to 100%. Fair odds are then 1 / fair probability.
This is the simplest no-vig method (proportional). Pinnacle and other sharp books are accurate enough that their no-vig prices are widely used as the "true" line for value-betting.
Frequently asked questions
What does "no-vig" mean?
No-vig odds are fair odds with the bookmaker margin removed: the prices that would apply if the implied probabilities of all outcomes added up to exactly 100%.
Which method does the calculator use?
Proportional (multiplicative) normalisation: each implied probability is divided by the sum of all implied probabilities. Other methods, such as power or Shin, treat longshots differently; the proportional method is the standard quick estimate.
How do fair odds help find value?
Calculate fair odds from a sharp market, then compare them with the prices offered elsewhere. If an offered price is higher than the fair odds, that bet has positive expected value according to the sharp market.