True Odds Calculator

Remove the vig to find true odds using multiple devigging methods.

Select the number of outcomes in the market.
Market decimal odds for outcome 1.
Market decimal odds for outcome 2.

Market Summary

Devigging Methods Comparison

Methods explained:
Equal Margin (Multiplicative): Divides each implied probability by the overround equally. True Prob = Implied Prob / Sum of IPs.
Power Method (Shin): Uses an iterative power-based approach: true odds = market odds^n where n is solved so probabilities sum to 1. Accounts for the fact that longshots carry more vig.
Additive: Subtracts an equal amount of probability from each outcome. True Prob = Implied Prob - (overround / n).