No-vig calculator
Updated August 2026
Strip the bookmaker's cut out of any pair of odds and see the market's honest percent.
4.5%
the bookmaker's cut (vig)
The two implied chances add past 100% — that extra is the book paying itself. Remove it and you get the market's honest opinion.
Where the extra percent hides
Add up both sides of any sportsbook line and you'll get more than 100%. That overage is the vig, the house's bite, charged not as a fee but as slightly-too-short payouts on both sides. This calculator normalizes the pair back to a true 100% and shows you what the market actually believes.
The number that keeps you honest
Serious bettors compare their opinions to no-vig prices, never quoted ones, because an “edge” smaller than the vig is just a donation with confidence. Prediction markets make this step unnecessary: an exchange price already sums to 100%, there is no margin to strip.
Quick answers
What is vig?+
The bookmaker's margin, baked into the odds so both sides are priced slightly worse than fair. On a standard -110/-110 line the two implied chances sum to 104.8%; the extra 4.8 points are the book's cut.
How does removing the vig work?+
Convert both sides to implied probability, add them (you'll get more than 100%), then divide each side by that total. What's left is the market's actual opinion, chances that sum to exactly 100%.
Why do no-vig odds matter?+
They're the honest benchmark. If your own estimate beats the no-vig number, not just the quoted number, you may have a real edge. Beating the quoted line by less than the vig is still a losing bet.