Introduction
A no vig calculator removes the bookmaker's built-in profit margin (called the "vig" or "juice") from betting odds. This lets you see the true implied probability of each outcome. Sportsbooks add vig to both sides of a bet so they make money no matter who wins. By stripping out that extra cost, you can find the fair odds for any market. Use this no vig calculator to compare the true odds against what a sportsbook is offering. If the sportsbook's odds are better than the fair odds, you may have found a value bet. This is one of the most important tools for smart sports bettors who want to make better decisions and find edges over the long run.
How to Use Our No Vig Calculator
Enter the odds for both sides of a two-way bet, and this calculator will strip out the bookmaker's vig (margin) to show you the true fair odds and probabilities for each side.
Side 1 Odds — Type in the odds for the first side of the bet. You can use any odds format you like: American (e.g., -110), Decimal (e.g., 1.91), Fractional (e.g., 10/11), or Probability with a percent sign (e.g., 52.4%). The calculator will automatically detect which format you entered.
Side 2 Odds — Type in the odds for the second side of the bet. Just like Side 1, you can enter these in American, Decimal, Fractional, or Probability format. For example, if Side 1 is the favorite at -110, Side 2 might be the underdog at +150.
Once both fields are filled in, the calculator instantly removes the vig and displays the fair probability, fair American odds, fair Decimal odds, and fair Fractional odds for each side. It also shows a visual probability bar, the total implied probability with vig included, and the exact bookmaker margin (overround) so you can see how much juice the sportsbook is charging.
What Is a No Vig Calculator?
A no vig calculator removes the bookmaker's built-in profit margin (called the "vig," "juice," or "overround") from a set of odds. This reveals the true fair odds and real implied probabilities of a sporting event. Every sportsbook adds vig to their odds so they can make money regardless of the outcome. That means the odds you see on a betting site don't reflect the actual chance each side has of winning — they're slightly skewed in the book's favor. This tool strips that margin away and shows you what the odds would look like in a fair market with no house edge.
How Does the Vig Work?
When a sportsbook posts odds like -110 on both sides of a bet, each side carries an implied probability of about 52.38%. Add those together and you get 104.76% — not 100%. That extra 4.76% is the vig. It's the sportsbook's commission, baked directly into the odds. In a truly fair market, the implied probabilities of all outcomes would add up to exactly 100%. The further above 100% the total goes, the more the bookmaker is charging you. Understanding how percentages work is fundamental to this concept — our Percentage Calculator can help you work through the underlying math if needed.
Why Should You Remove the Vig?
Removing the vig is one of the most important skills in sports betting. Here's why it matters:
- Find the true probability. Fair odds tell you what the market actually thinks each side's chance of winning is, without the sportsbook's cut inflating the numbers.
- Spot value bets. Once you know the fair line, you can compare it to odds at different sportsbooks. If a book is offering odds that are better than the fair price, you've found a value bet — and value bets are how sharp bettors profit over time.
- Compare sportsbooks fairly. Different books charge different amounts of vig. Stripping it out lets you compare their actual opinions on a game, not just how much margin they've added.
- Build better models. If you create your own probability estimates for games, you need a vig-free baseline from the market to measure your edge against.
How the Calculation Works
The no vig calculation uses a method called multiplicative normalization. First, each side's odds are converted into an implied probability. Then, both probabilities are added together to find the total (which will be above 100% when vig exists). Finally, each probability is divided by that total so they scale down proportionally and add up to exactly 100%. The result is the fair probability for each side, free of any bookmaker margin.
For example, if Side 1 is -150 (implied probability 60.00%) and Side 2 is +130 (implied probability 43.48%), the total implied probability is 103.48%. Dividing each by 1.0348 gives fair probabilities of roughly 57.98% and 42.02%, and the vig was 3.48%. This proportional scaling is similar to the logic behind a Percent Change Calculator, where you measure the relative shift between two values.
Supported Odds Formats
This calculator accepts odds in four common formats, so you can use whichever one you're most comfortable with:
- American odds (e.g., -110, +150) — the most common format at U.S. sportsbooks.
- Decimal odds (e.g., 1.91, 2.50) — popular in Europe, Canada, and Australia.
- Fractional odds (e.g., 10/11, 3/2) — traditional in the United Kingdom.
- Implied probability (e.g., 52.4%) — enter a percentage directly if you already know the implied chance.
You can even mix formats between the two sides. The tool detects which format you've entered and converts everything automatically. If you're working with baseball betting markets, you might also find our ERA Calculator, OPS Calculator, Batting Average Calculator, Slugging Percentage Calculator, and On Base Percentage Calculator useful for building your own probability models based on player and team statistics.