No-vig calculator
Enter the odds on every side of a market. The calculator removes the sportsbook's margin (the vig) and shows the fair odds left over: the price at which the book would make nothing either way.
How the no-vig calculation works
Every price implies a win chance: one divided by the decimal odds. On a fair market the chances add up to exactly 100%. A sportsbook's add up to more. The extra is its margin, and removing it gives the no-vig (or "fair") odds.
Each side's implied chance is divided by the total, so every side gives up the extra in proportion to its size.
fair chancei = (1 / oddsi) / Σ (1 / oddsj)
Worked example: -150 / +130
| Odds | Implied | No-vig chance | No-vig odds | |
|---|---|---|---|---|
| Side A | -150 | 60.00% | 57.98% | -138 |
| Side B | +130 | 43.48% | 42.02% | +138 |
The implied chances add up to 103.48%, a margin of 3.36%. With it removed, the favourite is a 57.98% chance, fair odds of about -138.
What to do with fair odds
Fair odds are an estimate, only as good as the prices you put in. When a book pays more than a fair price you trust, the bet has positive expected value. Check it with the expected value calculator.
Questions
What does no-vig mean in sports betting?
No-vig odds are a market's odds without the sportsbook's cut, so the implied chances of every side add up to exactly 100%. They estimate what each side would pay on a fair market.
How do you calculate no-vig odds?
Convert each side's odds to an implied chance (1 divided by decimal odds), add them up, and divide each side's chance by the total. Convert the result back to odds.
What is the difference between implied odds and no-vig odds?
Implied chances include the sportsbook's cut, so the sides add up to more than 100%. No-vig chances are scaled down so they add up to exactly 100%.
Does a no-vig calculator work for 3-way markets?
Yes. Enter the draw's odds too, and all three sides are scaled together so they add up to 100%.
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Updated 2026-10-26