No-Vig Fair Odds Calculator
Remove the sportsbook's vig to see the true fair odds and probabilities for both sides of a market.
Market Odds
Fair Odds (No Vig)
| Method | Side 1 Odds | Side 1 Prob | Side 2 Odds | Side 2 Prob |
|---|---|---|---|---|
| Multiplicative | — | — | — | — |
| Additive | — | — | — | — |
| Conservative | — | — | — | — |
How to use this no vig calculator
Enter the American odds for both sides of a two-way market, such as a moneyline, a spread, or a total. The calculator converts each price to an implied probability. Those two add up to more than 100%, and the amount over 100 is the vig. It removes that margin three ways: multiplicative (both sides scaled to 100%), additive (the extra split evenly), and a conservative column that keeps the lower fair probability. Read the fair odds in the table. A price at another book that pays more than the fair price is the number to check in the EV calculator. The result is an estimate of the market's price with the book's cut removed, and any one bet can still lose.
What Are No-Vig Odds?
Sportsbooks build a margin (vig) into their odds so that the implied probabilities of all outcomes add up to more than 100%. No-vig odds remove this margin to show the true fair probabilities the market is pricing in. The question is how to distribute the vig removal between the two sides — and there's no single "correct" answer. This calculator shows three methods so you can compare.
Multiplicative (Proportional)
The most common method in the sharp betting community. Each side's implied probability is scaled down proportionally so they sum to 100%. Sides with higher implied probability absorb more of the vig in absolute terms, but the ratio between the two sides stays the same. Formula: fair = implied / total
Additive (Equal)
Splits the overround equally between both sides. Each side has the same absolute amount of vig removed. This gives a slight edge to the favorite compared to multiplicative. Formula: fair = implied - (overround / 2)
Conservative (Min)
The lower fair probability from multiplicative and additive for each side. This is the most conservative estimate of each outcome's true likelihood — useful when you want to be cautious about sizing a bet.
Worked example
A two-way line of −110 and −110. Each side implies 52.38%, and together they imply 104.76%, so the vig is 4.76 percentage points. Dividing each side by the total leaves a 50% fair chance, which is even money, +100. Type −110 and −110 above and the multiplicative row should read +100 and 50.00% on both sides.
Why It Matters
No-vig odds are the fair-price estimate you compare with another book's number. If every method puts the fair chance below the chance implied by a price you can actually bet, the gap is wider. If only one method does, the gap is thin. The estimate is not a prediction of the next result. The longer version of where that fair chance fits is what is positive EV betting.
Frequently Asked Questions
What is a no vig calculator?
A no vig calculator, also called a devig calculator, removes the sportsbook's margin from a two-way line. You enter both prices and it returns the fair odds and fair probabilities, which is the market's price with the vig taken out.
How do you devig a betting line?
Convert each side's American odds to an implied probability. Those probabilities add up to more than 100%. Divide each one by the total so they add up to 100%. That proportional step is the multiplicative method, and it is the usual way to devig a two-way market.
What is a worked example of removing the vig?
A two-way line of -110 and -110 implies 52.38% on each side, 104.76% together, so the vig is 4.76 percentage points. Dividing each side by 104.76% leaves a 50% fair chance, which is even money, +100.
Does a no-vig price mean the bet wins?
No. No-vig odds are a fair-price estimate from the market, not a prediction of the next result. A bet can be priced better than that fair number and still lose. The average only shows up over many bets.
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