How the No-Vig Fair Odds Calculator Works
The Betstamp No-Vig Fair Odds Calculator removes the sportsbook's margin (vig) from a two-sided market and returns the true probability and fair odds for each side. Enter the odds for Outcome #1 and Outcome #2 — the calculator outputs the no-vig win percentage for each side and the corresponding fair odds.
This is one of the most important calculations in sharp sports betting. Once you know the fair odds, you can compare them to the prices available at other sportsbooks. If you find a better price than the fair odds, you've identified a +EV bet.
How to Use the No-Vig Calculator
- Enter the odds for Outcome #1
- Enter the odds for Outcome #2
- The calculator returns:
- No-Vig % (Outcome #1 and Outcome #2): the true win probability for each side with the vig removed
- Fair Odds (Outcome #1 and Outcome #2): the odds that outcome would be priced at in a no-vig market
What is Vig in Sports Betting?
Vig (short for "vigorish," also called "juice" or "margin") is the amount a sportsbook adds to every market to guarantee themselves a profit. In a vig-free market, the two sides' implied probabilities would sum to exactly 100%. In reality, they sum to 102–108% or more. The excess is the vig.
Standard example: –110 / –110 NFL spread.
- –110 implied probability: 52.4%
- Both sides combined: 104.8%
- Vig: 4.8%
That 4.8% is the sportsbook's edge. To quantify the vig directly as a number, use the [Betstamp Vig Calculator]. To see the sportsbook's theoretical profit margin, use the Betstamp Hold Calculator. The No-Vig Calculator takes the next step — stripping the vig and showing you what fair odds should look like.
How to Devig Odds Manually
Devigging a two-sided market takes three steps:
- Convert each side's odds to implied probability
- Add both implied probabilities together (sum will be over 100%)
- Divide each side's implied probability by the total, then convert back to odds
Example: Oregon –180 / Opponent +150
- Oregon implied: 64.3% | Opponent implied: 40.0% | Total: 104.3%
- Oregon no-vig: 64.3 / 104.3 = 61.6%
- Opponent no-vig: 40.0 / 104.3 = 38.4%
- Fair odds: Oregon –160, Opponent +160
If another sportsbook has Oregon at –150, that's a +EV bet compared to the fair price of –160. The Betstamp No-Vig Calculator runs this automatically.
No-Vig Odds vs Market Odds: Why It Matters
Every sportsbook lists odds with vig baked in. The amount varies significantly by market type:
- Mainline NFL/NBA spreads and totals: 4–5% vig — reasonable
- MLB moneylines, NHL puck lines: 3–4% vig — sharp
- Player props: 8–15% vig — high
- Futures (MVP, champion): 20–30%+ vig — very high
The No-Vig Calculator strips the vig from any two-sided market and shows you the true price. This lets you compare markets accurately and spot mispriced lines.
How Sharp Bettors Use No-Vig Fair Odds
Professional bettors rely on a short list of "sharp" sportsbooks — books that take high limits and price markets with minimal vig. Pinnacle and Circa are the most commonly used references.
The sharp workflow:
- Find the current two-way line at a sharp book
- Devig with the No-Vig Calculator to get the fair odds
- Compare to softer books (DraftKings, FanDuel, Caesars)
- If a soft book has a better price than fair, it's a +EV bet
Doing this across every line, every day, manually is impractical. [Betstamp PRO] automates this process across 20+ sportsbooks in real time.
Combining the No-Vig Calculator with Other Betstamp Tools
The No-Vig Calculator is the starting point for most +EV workflows. Combine it with:
- Betstamp Expected Value Calculator — plug your no-vig fair probability into the EV calculator to measure your edge in dollars
- Betstamp Kelly Calculator — once you have a +EV bet, Kelly tells you how much to stake
- Betstamp PRO — to find +EV bets automatically, without doing this math by hand on every line
With Betstamp PRO—the most advanced top-down betting odds screen in the market. Bettors will find hundreds of daily betting edges with ease, allowing you to scale your profits long-term. Click the banner to book a free demo.
