No-Vig Calculator

How to Calculate No-Vig Odds — Worked Example

Standard Spread: -110 on Both Sides

A sportsbook lists Chiefs -3.5 at -110 and Bengals +3.5 at -110. Each side implies a 52.38% win probability. Added together: 104.76%. The 4.76% above 100% is the vig — the sportsbook's built-in margin. On a hypothetical $100 wager, the implied cost of that margin is $4.76. In a hypothetical scenario of 500 wagers at $100 each with the same market pricing, the implied annual margin cost would be approximately $2,380.

The no-vig fair odds? +100 on both sides — a true coin flip. The difference between -110 and +100 is the price you pay for the sportsbook's service.

What Is Vig? (And What Does "No Vig" Mean?)

Vig — also called vigorish, juice, or the overround — is the built-in margin that a sportsbook or prediction market charges on every contract. It's the reason the implied probabilities of all outcomes add up to more than 100%: the difference is the platform's cut, baked directly into the prices you see.

A no-vig or devig calculation strips out that margin to reveal the true implied probabilities. If a sportsbook offers -110 on both sides of a spread, the vig-free fair odds are actually +100 on both sides — a true 50/50. Bettors and traders use no-vig fair odds to compare prices across platforms and identify lines with genuine value.

This sports betting vig calculator does that math automatically. Enter the odds for any market and it calculates the overround, the vig percentage, and the devigged fair probability for each side — so you know exactly what you're paying before you commit. A devigger like this is especially useful when shopping lines across multiple books, since even a 1–2% difference in vig compounds significantly over hundreds of wagers.

Frequently Asked Questions

What is vig, and why does it matter?

Vigorish (vig), or "juice," is the transaction fee sportsbooks charge to facilitate a bet. Unlike a brokerage that charges a flat commission, sportsbooks bake this fee into the odds. If a coin flip is a true 50/50 proposition (+100 in American odds), a sportsbook typically offers -110 on both sides. That 10-cent difference is the vig — your "entry tax" into the market. To break even at -110 odds, you must win 52.38% of the time just to cover the house margin.

Is vig the same thing as juice?

Yes. "Vig" (short for vigorish) and "juice" are interchangeable terms used in the sports betting industry. You may also hear it called the "house edge," "margin," "overround," or "hold." They all describe the same concept: the sportsbook's built-in commission on every wager. This calculator shows all of these metrics in one place.

What vig ranges are common across sportsbooks?

For standard 2-way markets (spreads and totals), competitive sportsbooks typically offer 3-5% vig. Some books known for lower hold, such as Pinnacle or Circa, may offer 2-3%. Margins above 6% are more commonly found on props, futures, or 3-way soccer markets. Lower vig translates to a lower break-even win rate — which is one reason many bettors compare pricing across multiple sportsbooks.

How do I calculate the no-vig fair odds?

To find the true probability of an event, strip the house's margin: (1) Convert the American odds for both sides into implied probabilities. (2) Sum those probabilities — it will exceed 100%, and the excess is the overround. (3) Divide each side's probability by the total sum to get the fair probability. (4) Convert that fair probability back into American odds. This calculator does all four steps automatically.

How does vig affect 3-way markets (Soccer/Hockey)?

In a 3-way market (Win-Loss-Draw), the vig is often higher because the sportsbook has three surfaces to shave margin from. A "fair" market totals exactly 100%, but 3-way soccer markets typically sit between 105% and 108%. This calculator uses proportional scaling (the multiplicative method) to distribute margin accurately across all three outcomes, giving you a more precise "fair price" than simple additive models used by most competing tools.

Does the vig change on live (in-play) betting?

Generally yes — and typically not in the bettor's favor. Live betting markets tend to carry higher vig because sportsbooks compensate for increased uncertainty and rapid line movement during games. It's common to see live spreads at -115 or -120 on both sides rather than the standard -110. This calculator can be used to compare the implied margin across different market prices, including live markets.

How much does the sportsbook actually make per bet?

On a standard -110/-110 market, the sportsbook's theoretical margin is 4.76%. For every $220 wagered ($110 on each side), the book pays out $210 to winners and keeps $10 — regardless of which side wins. That's a 4.55% return on handle. Over thousands of bets and millions of dollars wagered, this margin is what funds the sportsbook's operations, promotions, and profit. The "Estimated Annual Cost" feature above illustrates how this margin compounds at different hypothetical wagering volumes.

How does vig affect long-term expected returns?

Vig changes break-even thresholds and expected returns over repeated wagers. At standard -110 odds, the break-even win rate is 52.38%. In a hypothetical scenario, a bettor winning 55% of wagers at -110 would see roughly 4.8% expected return on wagered amount. The same win rate at -105 (lower margin) would yield approximately 7.3% expected return — illustrating how small pricing differences compound over a large number of wagers.

How does market pricing differ across sportsbooks?

Common differences bettors observe include: (1) Pricing variation — the same market may be listed at -110 on one book and -108 on another, and these differences compound over many wagers. (2) Reduced-hold books — some sportsbooks, such as Pinnacle, Circa, or betting exchanges, are known for consistently offering lower-margin pricing. (3) Market type differences — higher-vig markets, such as player props, exotic parlays, and futures, generally carry 8-15% margin compared to 3-5% on main markets like spreads and totals.

What does devig mean?

Devig (or "devigger") means removing the vig from a set of odds to calculate the true implied probabilities. It's the same as calculating no-vig fair odds. A devigger takes the raw market prices, identifies how much of the implied probability is overround, and scales each side back down to a fair 100% total.

What is an overround?

The overround is the total implied probability across all outcomes when it exceeds 100%. For example, if the YES side implies 54% and the NO side implies 50%, the overround is 4% — that 4% is the market's built-in edge. A perfectly fair market would total exactly 100%. The overround is another name for the vig, expressed as the excess over 100% rather than as a percentage of the total.

How do I calculate no-vig fair odds?

Divide each side's implied probability by the sum of all implied probabilities. For example: if Side A implies 52.38% and Side B implies 52.38%, the total is 104.76%. Dividing each by 104.76% gives 50% fair probability for each side — the no-vig line. This calculator does it automatically. Enter the YES and NO prices and it returns the devigged fair probability for each side, in whichever odds format you prefer.

Educational use only. ChanceMetrics provides general informational tools and mathematical illustrations. Nothing on this page is betting, investment, legal, or tax advice. Outputs are hypothetical, are not personalized recommendations, and do not suggest that any wager should be placed.

ChanceMetrics provides educational tools and calculators for informational purposes only and does not constitute financial or investment advice. Prediction markets and sports betting involve significant risk of loss. The outputs are mathematical estimates based on hypothetical assumptions and do not guarantee any actual future profit or outcome.

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