No Vig Fair Odds Calculator
Every price a sportsbook posts carries a built-in margin. This no vig calculator strips that margin out and shows you the fair probability and the fair odds sitting underneath the line.
Enter the odds for each outcome in a market and you get three numbers back per outcome: the raw implied probability of the posted price, the no vig probability once the margin is removed, and the fair odds that match it. The market vig is shown at the top of the panel so you can see exactly how much the book is charging you to take the bet.
Fair odds are the reference point for almost every edge calculation a trader runs. If you want to know whether a price is worth taking, whether two venues disagree enough to matter, or what a sharp book really thinks a team’s chances are, you have to remove the vig first. The calculator handles two way markets by default and supports up to eight outcomes for three way soccer lines, futures, and multi runner fields.
How to use this calculator
- Enter the odds for every outcome in the market, not just the side you are interested in. The margin can only be removed if the full market is present, because the calculation works off the total.
- Pick your odds format. American is the default, where a favourite is negative and an underdog positive, and the plus sign is optional. Use the toggle for Decimal prices like
1.556, Fractional prices like10/11, or Percent for prediction market prices, where a contract at 64 cents is simply64%. Anything already entered is converted for you, and typing a price with a percent sign, a slash, or a decimal point switches the format automatically. Fractional results are rounded to the simplest fraction within half a percent, because exact fair prices rarely land on a clean one. - Add outcomes if you need them. Two rows load by default. Use Add outcome for a three way soccer market or a small futures field.
- Read the Vig figure in the panel header. That is the book’s margin on this market. Under 3 percent is sharp, 5 percent or more is retail pricing.
- Compare the fair odds to what you can actually bet. If the price available to you is better than the fair odds, you have positive expected value.
How no vig odds work
A fair two way market adds up to 100 percent. Real markets never do. A book prices both sides so the implied probabilities total more than 100, and that overshoot is the vig, also called the juice or the hold.
Step one: convert odds to implied probability
Decimal odds are the simplest case: implied probability is just 1 / decimal. Fractional odds are denominator / (numerator + denominator), so 10/11 implies 52.38 percent. Positive American odds become 100 / (odds + 100) and negative odds become |odds| / (|odds| + 100). Every route agrees, because -180, decimal 1.556 and fractional 5/9 are the same price, and all of them give 64.29 percent. Alongside it, +155 is decimal 2.55 or fractional 31/20, implying 39.22 percent.
Step two: find the overround
Add the implied probabilities together. In this example the total is 103.51 percent, which means the vig is 3.51 percent. The book has sold 103.51 percent of a market that can only ever pay out 100 percent.
Step three: remove the margin proportionally
Divide each implied probability by the total. This is the multiplicative method, the standard approach, and it removes the margin in proportion to each outcome’s own probability. Then convert the result back into odds.
The gap between the posted price and the fair price is what the vig costs you. On this market you were being asked to pay -180 for something worth -163.93. The hairline bar under each row in the calculator shows the same thing visually, with the grey segment as the posted implied probability and the gold segment as the fair probability. The space between them is your outcome’s share of the vig.
Where you take your fair odds from matters as much as the maths. De-vigging a soft retail book gives you a fair price contaminated by that book’s bias and its slow line movement. De-vigging a sharp market gives you a number worth trading against, which is why the DG3 terminal builds its Edge Finder on a no-vig Pinnacle signal and ranks markets by the EV gap between that fair price and what prediction markets are showing. The calculator here does the same arithmetic by hand, one market at a time.
Frequently asked questions
What is a no vig calculator?
A tool that takes the odds a bookmaker posts for every outcome in a market and removes the built-in margin, leaving the fair probability and fair odds behind. It answers the question of what the price would be if the book were not charging you to bet.
How do you remove the vig from betting odds?
Convert each outcome’s odds to an implied probability, add those probabilities up to get the overround, then divide each one by that total. The results sum to exactly 100 percent. Converting them back to odds gives you the no vig fair odds.
What counts as a high vig?
It depends on the market. A sharp two way line on a major sport usually runs between 2 and 4 percent. Standard retail pricing of -110 on both sides is 4.76 percent. Player props, alternate lines, and long shot futures frequently sit above 8 percent, and some exceed 20 percent.
Does this work for three way markets?
Yes. Use Add outcome to create a third row for a soccer market with a draw, or add more rows for a small futures field. The same proportional method applies to any number of outcomes, and the calculator supports up to eight.
Is the multiplicative method the most accurate way to de-vig?
It is the most widely used and the best default, but not the only one. Additive de-vigging subtracts the margin equally across outcomes, and the Shin and logarithmic methods assume the margin is loaded more heavily onto long shots. The differences are small on balanced two way markets and grow as prices get more lopsided.
How do fair odds help me find value?
Fair odds are your estimate of true probability, so they are the benchmark for every expected value comparison. If a price available elsewhere is better than the fair odds you calculated from a sharp market, that price carries positive expected value. The size of the gap tells you how much.