No-Vig Fair Odds Calculator
Remove the sportsbook's margin to find the true fair odds for each side.
No-Vig Fair Odds Calculator
A no-vig calculator strips the sportsbook's margin out of a market so you can see the fair odds underneath. That is a big deal because the line you see at the book is not pure probability. It is probability plus the sportsbook's cut.
If both sides of a market add up to more than 100 percent, that extra percentage is the vig. That is the tax built into the bet. A no-vig fair odds calculator backs that out and gives you a cleaner view of what the market actually thinks before the juice gets layered on top.
This is one of the most useful ways to evaluate price. Once you know the no-vig number, you can compare that fair line to what another sportsbook is offering and see whether there is real value there. Without that step, a lot of bets look better than they really are. A no-vig calculator for sports betting helps you stop evaluating juiced prices as if they are fair.
You will see this tool called a few different names: no vig calculator, devig calculator, devigger, or fair odds calculator. They all do the same job — remove the vig so you can judge a price on its merits. It is the foundation of positive EV betting: once you know the true no vig probability of an outcome, you can compare it against any price on the market and instantly see whether a bet has edge.
There are several devig methods, and serious bettors use more than one. The multiplicative method scales both sides evenly and is the standard default. The additive method subtracts the margin equally, which treats longshots differently. The power method sits in between and often models favorite-longshot bias best. This no vig calculator supports all three, so you can sanity-check a price from every angle before you bet it.
Prefer not to do this by hand? AVO's positive EV betting tool devigs the market for you and flags mispriced lines automatically.
Frequently Asked Questions
What do fair odds mean?
Fair odds, also called no-vig fair odds, are the odds you would get if the sportsbook removed its margin from the market.
The number you see at the book is not just probability. It is probability plus vig. That is why two evenly matched teams are usually not both listed at +100. More often, you will see something like -110 on both sides. The extra pricing built into those lines is the sportsbook's cut.
When bettors talk about fair odds, they are talking about the cleaner number underneath the juice. That is the number you actually want when comparing prices or deciding whether a bet has value.
How do you calculate fair odds?
You calculate fair odds by first converting both sides of a market into implied probability, adding them together, and then removing the vig proportionally.
Take a simple two-way market where both sides are -110.
Each side implies about 52.38%, which adds up to 104.76%. That extra 4.76% is the vig.
To remove it, divide each side's implied probability by the total:
52.38 / 104.76 = 50.0% 52.38 / 104.76 = 50.0%
Now you are back to a fair 50/50 market.
That is the point of a no-vig calculator. It takes the sportsbook tax out of the line so you can see the real probability underneath.
What is a devig calculator?
A devig calculator is the same tool as a no vig calculator — the names are used interchangeably. Both take the two sides of a market, remove the sportsbook's built-in margin (the vig), and return the fair, no-vig odds and true implied probabilities.
Bettors use the devigged number as the benchmark: if you can bet an outcome at better odds than its no-vig fair price at a sharp book, the bet is positive EV.
Which devig method should I use?
The multiplicative method is the standard default and works well for most two-way markets. The additive method distributes the vig equally between sides, which can better represent markets with a heavy favorite. The power method often fits best where favorite-longshot bias is strong.
If you are new to devigging, start with multiplicative. If the methods disagree meaningfully on a price, that itself is useful information — the edge is not as clear as it looks.
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