No-Vig Fair Odds Calculator

Sportsbook prices include a built-in margin — the vig. Add up the implied probabilities of every outcome in one market and you'll get more than 100%; the excess is the book's edge. Removing it ("devigging") reveals the fair probability the prices actually imply, which is the baseline for judging whether any bet is good value.

Enter every price the book quotes for one market. The default multiplicative method scales each probability down proportionally and is the standard choice. The additive method subtracts the margin equally, and the power method accounts for the favorite-longshot bias by shaving more from longshots. You'll get the fair probability and the no-vig odds for each outcome — feed those into the expected value calculator to grade a price you're being offered elsewhere.