No-Vig Calculator
Enter the two sides of any sportsbook market — moneyline, spread, total, prop — and instantly see the no-vig (fair) odds and true implied probability for each outcome.
American format, e.g. -110 or +120
The opposing side from the same book
The vig is the sportsbook's built-in margin. The lower the vig, the closer the posted price is to fair — which is why sharp books like Pinnacle typically run 2–3% holds on major markets.
How no-vig odds work
Every sportsbook bakes a margin — the vig (also called juice or hold) — into both sides of a market. Add the two implied probabilities together and they'll total more than 100%. That excess is the book's edge.
A no-vig calculator strips that margin out. The formula:
fair_prob(A) = implied_prob(A) / (implied_prob(A) + implied_prob(B))The result is the true probability the market is pricing — and the corresponding fair American odds. Compare that price to what your sportsbook is offering and you can see, in seconds, whether a bet has positive expected value.
Worked example
- 1Side A −110 → 52.38% implied100 / (110 + 100)
- 2Side B −110 → 52.38% impliedSame math, same price
- 3Sum of both sides: 104.76%The 4.76% over 100% is the vig
- 4Fair prob for A: 52.38 / 104.76 = 50.00%Divide each side by the total
- 5Fair American odds: +100 / +100A perfectly fair coin flip
When to use this
- Line shopping. Devig a sharp book's price, then check if your favorite sportsbook is offering better than fair.
- Evaluating a boost. Compare a boosted price to the no-vig market price to see if it's actual edge or marketing dressing.
- Sizing bets. Use the true probability as your input for Kelly criterion or any staking model.
- Grading parlays. Devig each leg before multiplying — that's the only way to spot a +EV parlay.
Frequently asked questions
What is a no-vig calculator?+
A no-vig calculator (also called no-juice or devig) removes the sportsbook's built-in margin from a two-way market and returns the fair odds — the price that reflects the true probability of each outcome.
How is no-vig calculated?+
Convert each side's American odds to implied probability, sum them (the total will exceed 100% because of vig), then divide each side by that total. The result is the fair probability for each outcome.
Which sportsbook should I devig?+
Sharp books like Pinnacle and Circa run 2–3% holds, so their devigged prices are closest to true. Devigging DraftKings, FanDuel or BetMGM is less accurate because their wider holds reflect their book balancing, not market consensus.
Does the multiplicative method work for player props?+
Yes — for two-sided over/under or yes/no markets at the same line. For three-way markets (soccer 1X2) or correlated SGP legs, more advanced methods like Shin or power adjustment can be more accurate.
How do I use no-vig odds to find +EV bets?+
Devig the sharpest market you can find. Then compare that fair price to your own sportsbook. If your book pays more than fair, you have positive expected value — that's a +EV bet.
Skip the math entirely
Our Bet Analyzer pulls live no-vig prices from the major US books automatically. Paste a sportsbook screenshot or describe your bet and you'll get the fair price, your edge, and a plain-English A–F grade in seconds.