Definition
Fair odds (also called true odds or no-vig odds) are the odds that would be offered if there was no sportsbook margin. They represent the actual probability of an outcome without any built-in profit for the book. Comparing market odds to fair odds reveals whether a bet has positive expected value.
Example
A game has -110/-110 odds. After removing the vig, fair odds are +100/+100 (50% each side). If you find a book offering +105 on one side, that's above fair odds—a potentially +EV bet.
Common Questions
How do I calculate fair odds?
How do I calculate fair odds?
Remove the vig from both sides proportionally. For -110/-110: implied prob = 52.4% each. Total = 104.8%. Fair prob = 52.4/104.8 = 50%. Convert back to odds: +100. Use our vig calculator to do this automatically.
Where do fair odds come from?
Where do fair odds come from?
The most common source is Pinnacle, a sharp sportsbook with minimal vig. Their closing lines are considered the most efficient. Tools like +EV Bets calculate fair odds from sharp market consensus.