No-Vig (Fair Odds) Calculator
Enter both sides of a market to remove the bookmaker margin and reveal the true, vig-free probabilities and fair odds.
Bookmaker margin (vig): 4.71%
Fair A
50.00% · 2.00
Fair B
50.00% · 2.00
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What the vig hides
Books build a margin into both sides so the implied probabilities add up to more than 100%. Removing the vig shows the bookmaker true estimate of each outcome — the baseline for finding value.
Finding value
If another book offers better than the no-vig fair odds, that is a +EV bet. This is the core of sharp betting.