No-Vig Odds Calculator: Find the True Fair Odds
Get personalized tool recommendations in 60 seconds
Every sportsbook builds a margin into their odds. That margin is called the vig (or juice), and it is the reason a standard bet on both sides of a spread costs -110 instead of +100. Our no-vig calculator strips that margin out and shows you the true fair odds. Enter the odds for both sides of a market, and you will instantly see the fair probability, fair odds, and exactly how much vig the book is charging.
How It Works
The calculator uses a simple but powerful method called the multiplicative method to remove the vig:
Convert both sides' odds to implied probabilities
Add them together (this total will be over 100% — the excess is the vig)
Normalize each probability so they add up to exactly 100%
Convert back to your preferred odds format
For example, a standard -110 / -110 line implies 52.4% for each side, totaling 104.8%. The extra 4.8% is the vig. After removing it, each side's fair probability is 50%, which equals +100 odds.
What Is the Vig?
The vig (short for vigorish, also called juice or the overround) is the sportsbook's built-in commission on every bet. It is how sportsbooks make money regardless of the outcome.
A -110 line on both sides means you risk $110 to win $100. If the book takes equal action on both sides, they collect $220 and pay out $210, keeping $10 as profit. That is the vig in action.
Different markets carry different vig amounts:
- NFL spreads and totals: Typically 4-5% (standard -110 on both sides)
- NFL moneylines: 3-6% depending on the matchup
- Player props: 5-10% — books charge more vig on less liquid markets
- Futures: 15-40% — the most expensive markets to bet
Why Removing The Vig Matters
Knowing the fair odds helps you in three ways:
Finding value bets. If the no-vig line says a team has a 55% chance of winning, but another sportsbook is offering odds that imply only 50%, that is a value bet. The difference between the fair price and the offered price is your edge.
Comparing sportsbooks. Not all books charge the same vig. By calculating the no-vig odds, you can see which sportsbook is offering prices closest to fair. Over hundreds of bets, even 1-2% less vig adds up.
Understanding what the market actually thinks. The raw odds include the book's margin. The no-vig odds tell you what the market actually believes the probability is, without the house tax baked in.
Tips for Using the No-Vig Calculator
Line shop first. Grab the best available odds from multiple books before calculating. The tighter the line, the less vig you are paying.
Compare across books. Run the same market from two different sportsbooks through the calculator. The one with the lower vig is giving you a better deal.
Use it for props. Player prop markets often carry 8-10% vig. Knowing the fair line helps you avoid overpaying on props where the book has a massive edge.
Pair it with a positive EV strategy. If you are already tracking closing line value or using +EV tools, the no-vig calculator helps you verify whether a bet is truly priced below fair value.
