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No-Vig Fair Odds
Sportsbooks bake a margin into every market. Strip it out to see the true price.
When you see a market like -110 / -110, the sportsbook isn’t offering a fair coin flip — it’s charging the vig(also called juice). That margin is the book’s edge, and it’s the reason both sides imply more than 100% combined probability.
Where the margin hides
A -110 price implies a win probability of about 52.38%. Two sides at -110 imply 104.76% total — that extra 4.76%is the vig. You can’t bet on a 104.76% world, so the implied numbers need to be normalized.
Removing the vig
- Convert each side to its implied probability.
- Add the two probabilities together.
- Divide each side by that total.
For -110 / -110: 52.38% / 104.76% = 50.0% each — a fair coin flip, as expected. For a lopsided market like -200 / +170, the fair numbers come out around 64% / 36% instead of the juiced 66.7% / 37.0%. Run any market through the no-vig calculator.
Putting it to work
No-vig odds approximate the market’s honest opinion. If your expected value estimate — or our projection — implies a higher win probability than the fair price, that gap is your edge. PropProphet compares projections to the no-vig line to flag those spots.
Frequently asked
What is the vig?
The vig (or juice) is the sportsbook's built-in margin. It's why both sides of a two-way market imply probabilities that add up to more than 100%.
How do you remove the vig?
Convert both sides to implied probabilities, add them up, then divide each by that total. The results are the no-vig fair probabilities, which sum to 100%.
Why do no-vig odds matter?
No-vig odds estimate the market's true view of a bet. Comparing your projection (or a sharp book) to the fair price is a cleaner way to spot an edge than using the raw, juiced odds.