Enter both sides of any market and this no-vig calculator strips the bookmaker margin out of the price, showing you the fair odds and the true probability behind the line. It is the fastest way to see what a market is really telling you once the built-in edge is removed.
No-Vig Fair Odds Calculator
The tool takes American, decimal and fractional odds and converts between them automatically, so you can enter a price in whatever format your book displays and read the fair odds in the same one. Many competing tools accept American only.
Remove the Vig and See Fair Odds
Every price a book posts includes a margin, the small edge that makes the two sides of a market add up to more than 100%. Removing that margin leaves the fair odds, the prices that reflect each outcome’s true probability with no house edge baked in. This calculator does that in one step, so you can compare a book’s real assessment of a game against your own.
Bookmaker Margin
The margin is the gap between the market total and a fair 100%. On a two-sided market priced at -110 each way, the implied probabilities total 104.76%, so the margin is 4.76%. The calculator shows this figure alongside the fair odds, because the size of the margin tells you how much the price is working against you before you even pick a side.
How to Use This No-Vig Calculator
It works the same way for every sport and takes a few seconds.
- Enter the odds for both sides of the market in American, decimal or fractional format.
- Read the fair odds and true probability the moment both prices are in. There is no button to press.
- Compare the fair odds against the price you can actually bet. If a book beats the fair line, that side has value.
What is a No-Vig Calculator
A no-vig calculator removes the bookmaker margin from a market to reveal the fair odds. It works by converting each price to an implied probability, totalling them, and scaling them back down to 100% so the margin disappears. What is left is the true probability of each outcome and the fair price that matches it.
This is how you remove vig from odds by hand, and how you calculate no-vig odds for any two-way market: take the implied probability of each side, divide it by the combined total of both sides, and convert the result back to odds. The calculator on this page does that instantly, but the method is worth understanding because it is the foundation of fair-odds betting.
How No-Vig Calculations Work
The calculation is the same every time. Convert each outcome to an implied probability, add them, then divide each one by the total to remove the margin and reach the fair probability. Convert that back to odds and you have the fair price.
- Convert each price to an implied probability. A -150 favorite implies 60%, a +130 underdog implies 43.48%.
- Add them. Here the total is 103.48%, so the margin is 3.48%.
- Divide each side by the total. 60 divided by 103.48 is 57.98%, and 43.48 divided by 103.48 is 42.02%.
- Convert the fair probabilities back to odds, which gives -138 and +138.
For the first step on any price, our implied probability calculator turns American, decimal or fractional odds into a percentage, which you then total and scale to reach the fair line.
No-Vig Examples by Sport
These two examples show the calculator applied to real market types, a two-way moneyline and a point spread. Each shows the input odds, the total implied probability, the margin, and the fair odds with it stripped out.
MLB Moneyline
A Yankees versus Red Sox moneyline priced at -150 and +130. The two sides imply 60% and 43.48%, totalling 103.48%, so the margin is 3.48%. Strip it out and the fair odds come back at -138 and +138.
| Side | Book odds | Implied % | Fair odds | Edge % |
|---|---|---|---|---|
|
Yankees |
-150 |
60.00% |
-138 |
-2.02% |
|
Red Sox |
+130 |
43.48% |
+138 |
-1.46% |
|
Market |
|
103.48% (3.48% margin) |
100% |
|
The Edge % column shows how much each side runs against you at the book price; a negative figure means you are paying over the fair odds. The fair line is your benchmark, so if another book prices the Yankees better than -138, that side carries value even though the original -150 looked like no bargain.
NFL Point Spread
A Chiefs versus Bills spread with both sides at -110, the standard two-way price. Each side implies 52.38%, totalling 104.76%, so the margin is 4.76%. Removed, the fair odds on both sides come back to an even +100.
| Side | Book odds | Implied % | Fair odds |
|---|---|---|---|
|
Chiefs -3 |
-110 |
52.38% |
+100 |
|
Bills +3 |
-110 |
52.38% |
+100 |
|
Market |
|
104.76% (4.76% margin) |
100% |
A symmetric -110 market is fair at a coin-flip once the margin comes out, which is why +100 on both sides is the true price of a genuine pick em. Any book offering better than +100 on either side is handing you an edge.
When Fair Odds Tell You to Bet
Fair odds turn a vague sense of value into a number. Once you know the fair price of a market, any book beating that price is offering positive expected value, and any book worse than it is charging you extra margin. The fair line is the line in the sand.
Working Out Your Edge
Your edge is the gap between the fair odds and the price you can bet. If the fair price is +138 and a book offers you +145, you are getting paid more than the true probability says you should be, which is a real, measurable edge. Feed both numbers into our expected value calculator to turn that gap into an expected return per bet.
Creating Synthetic Low-Vig Lines
Line shopping lets you build a market with less margin than any single book offers. Take the best price on each side from different books, and the combined margin on your two bets is lower than either book alone. Push it far enough and the margin turns negative, which is an arbitrage, and our arbitrage calculator finds those.
The no-vig line is what makes shopping precise. By converting each book’s price to its fair odds, you can see which book is genuinely offering the best side rather than just the biggest number. To measure the total margin across a whole market rather than one side, use our hold across a full market tool.
Frequently Asked Questions
What is a no-vig calculator?
A no-vig calculator removes the bookmaker margin from a market to show the fair odds and true probability of each outcome. It converts both prices to implied probabilities, totals them, and scales them back to 100%, leaving the fair line you can measure any book’s price against.
How do you calculate no-vig odds?
Convert each side to an implied probability, add them, then divide each by the total to remove the margin. Convert the fair probabilities back to odds. For a -150 and +130 market, the fair odds come out at -138 and +138 once the 3.48% margin is stripped.
How do you remove vig from odds?
Removing vig means scaling the two implied probabilities back down so they total 100% instead of more. Divide each side’s implied probability by the combined total, then convert back to odds. The result is the fair price, with the bookmaker margin taken out of both sides proportionally.
What does devig mean?
Devig is short for removing the vig, the bookmaker margin, from a betting market. To devig a line is to convert its prices into fair odds that reflect true probability with no house edge. Devigging is the core method sharp bettors use to find value against the closing line.
When should you use a no-vig calculator?
Use one whenever you want to know a market’s true probability, compare prices across books, or check whether a line offers value. It is most useful for finding the fair price of a market, then spotting which book beats that price on either side.
What is the difference between fair odds and book odds?
Book odds include the bookmaker margin, so the two sides total more than 100%. Fair odds have that margin removed, so they total exactly 100% and reflect true probability. The gap between them is the edge the book holds on every bet you place.
Can no-vig odds help me find value?
Yes. Fair odds are the benchmark for value betting. Once you know the fair price of a market, any book offering better than that price on either side is giving you positive expected value, which is the foundation of long-term profitable betting.