No-Vig Fair Odds Calculator
Remove the sportsbook's vig to see the true fair odds and probabilities for both sides of a market.
Market Odds
Fair Odds (No Vig)
| Method | Side 1 Odds | Side 1 Prob | Side 2 Odds | Side 2 Prob |
|---|---|---|---|---|
| Multiplicative | — | — | — | — |
| Additive | — | — | — | — |
| Conservative | — | — | — | — |
What Are No-Vig Odds?
Sportsbooks build a margin (vig) into their odds so that the implied probabilities of all outcomes add up to more than 100%. No-vig odds remove this margin to show the true fair probabilities the market is pricing in. The question is how to distribute the vig removal between the two sides — and there's no single "correct" answer. This calculator shows four methods so you can compare.
Multiplicative (Proportional)
The most common method in the sharp betting community. Each side's implied probability is scaled down proportionally so they sum to 100%. Sides with higher implied probability absorb more of the vig in absolute terms, but the ratio between the two sides stays the same. Formula: fair = implied / total
Additive (Equal)
Splits the overround equally between both sides. Each side has the same absolute amount of vig removed. This gives a slight edge to the favorite compared to multiplicative. Formula: fair = implied - (overround / 2)
Conservative (Min)
The lower fair probability from multiplicative and additive for each side. This is the most conservative estimate of each outcome's true likelihood — useful when you want to be cautious about sizing a bet.
Why It Matters
No-vig odds are the foundation of +EV betting. If the fair probability under every method is lower than what the posted odds imply, you have a strong edge. If only the best-case method shows value, the edge is marginal. Comparing all four methods gives you a confidence range rather than a single point estimate.
Frequently Asked Questions
What are no-vig odds?
No-vig odds are the true fair odds for a market after removing the sportsbook's built-in margin. They represent what the odds would be if the sportsbook charged no commission at all. No-vig odds give you a clearer picture of what the market believes the true probability of each outcome is.
How do you remove the vig from sportsbook odds?
To remove the vig, first convert both sides' odds to implied probabilities, which will sum to more than 100%. Then normalize each probability by dividing it by the total. This is the multiplicative method, which is the most commonly used approach in the sharp betting community. Other methods include the additive approach and the conservative approach.
What are fair odds in sports betting?
Fair odds are the odds that would reflect the true probability of an outcome without any sportsbook margin built in. If a team has a true 50% chance of winning, the fair odds would be +100 (even money). Comparing fair odds to the actual posted odds is how sharp bettors identify positive expected value opportunities.
Why are no-vig odds important for +EV betting?
No-vig odds serve as the baseline for determining whether a bet has positive expected value. If a sportsbook posts odds that are better than the no-vig fair price derived from the sharpest market, that bet likely has +EV. This is the foundation of how professional bettors and betting tools identify edges.
Get the Edge with Optimal Bet
Our app scans sportsbook pricing across the market to expose inefficiencies and uncover +EV edges. We compare odds, surface high-value opportunities, and deliver precision alerts so you can move with conviction.
