Tools · Calculator
Devig Odds
Strips the bookmaker's margin out of a market to recover the no-vig fair odds and true win probabilities — the foundation for spotting +EV bets against a sharp line.
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Bookmaker vig
Enter the odds for each outcome to recover the fair, no-vig line.
How devigging works
Every posted price carries the book's margin (the vig), so the implied probabilities of a market add up to more than 100%. Devigging removes that margin and rescales the outcomes back to a fair 100%, giving you the book's true estimate of each side's win probability and its fair, no-vig price.
There's no single “correct” way to split out the margin — these are the four standard models:
MultiplicativeScales every implied probability by the same factor. Simple and the most widely used default.
AdditiveSubtracts an equal share of the margin from each outcome. Shifts more weight to longshots.
PowerRaises each probability to a common exponent. Tends to fit favourite–longshot bias better.
ShinModels the margin as protection against sharp money. Often the most accurate on two-way markets.