Beginner's guide
What Is No-Vig Probability?
Remove the sportsbook's built-in fee to estimate the market's fair probability.
Written and reviewed by LineLens · Reviewed July 18, 2026 · 5–7 minute read
How we create and check guidesThe short answer
No-vig probability is an estimate of an outcome's true probability after removing the sportsbook's built-in fee. Sportsbook odds describe both the event and the price the book charges. Removing that extra charge makes different books easier to compare.
Simple example
If both sides are priced at -110, each side implies a 52.38% chance. Together that equals 104.76%, which cannot be the true probability of a two-outcome market. Dividing each side by the 104.76% total produces a no-vig estimate of 50% for each side.
Why sportsbooks add vig
The extra probability is often called the vig, hold, juice, or margin. It gives the sportsbook a theoretical advantage when it accepts bets on both sides. A larger margin generally means a worse price for the bettor.
LineLens removes each book's vig separately before combining the results. It never mixes a -3 spread with a -3.5 spread because those are different bets.
How to use it
- Compare the exact same outcome and line.
- Convert every price to implied probability.
- Divide each side by the market's total implied probability.
- Compare the resulting fair probability with the payout being offered.
What it cannot tell you
No-vig probability is a market estimate, not a prediction guaranteed to be correct. Thin markets, stale prices, injuries, and late information can all weaken it. A 50% estimate still means losing about half the time.
Keep learning
What Does Positive EV Mean in Sports Betting?
Understand what a positive edge means—and what it does not promise.
What Is Closing-Line Value?
Compare your placed price with the market's last price before an event starts.
How to Compare Sportsbook Odds
The same outcome can pay differently at every sportsbook.