No-Vig Fair Odds Calculator

Free no-vig tool — strip bookmaker margin and see fair odds in seconds

What are No-Vig Fair Odds(also: devig Calculator)?

Sportsbooks build profit into every market via the vig (juice, margin, or overround). When you add implied probabilities from all outcomes, the total exceeds 100%—that excess is the book's edge.

This free no-vig calculator strips that margin to reveal fair (true) probabilities and fair odds for 2-, 3-, and 4-way markets—instantly. Use fair prices to spot value, compare books, and size +EV bets.

Enter Odds (Decimal)

Results

Enter odds for each outcome — implied probabilities, vig %, and fair no-vig prices update automatically.

Implied Probabilities Fair Analysis (No-Vig Analysis)
Please enter valid values for both odds.
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How to Use This Calculator

The No-Vig Fair Odds Calculator helps you determine the true probabilities and fair odds by removing the bookmaker's margin (vig) from the odds.

  • Market type (2 / 3 / 4 way): Choose 2-way (moneyline/spread), 3-way (1X2), or 4-way markets. Each mode shows the correct number of odds fields.
  • Odds format: Use the odds format dropdown (Decimal, American, Fractional, etc.). It syncs with your site preference and converts inputs automatically.
  • Odds 1: Enter the first odds
  • Odds 2: Enter the second odds

This calculator will show you:

  • The true probability for each outcome (without the vig)
  • The fair odds for each outcome (without the vig)

Note: The calculator assumes that the bookmaker has balanced the market. The sum of the implied probabilities will be greater than 100% due to the vig, and this calculator removes that margin to show you the true probabilities.

Tips & Best Practices
  • Use no-vig probabilities to identify value bets by comparing with your own estimates.
  • Fair odds help you understand what odds would be offered in a zero-margin market.
  • Compare no-vig odds across different sportsbooks to find the best available prices.
  • This tool works best with two-way markets like moneylines, spreads, or totals.
  • 3-way soccer (1X2) and 4-way golf markets need all listed prices—missing a leg skews vig and fair odds.

How No-Vig Fair Odds Work in Sports Betting

For decimal odds Oᵢ on outcome i, implied probability is pᵢ = 1/Oᵢ. In a fair market, Σpᵢ = 100%. Real books publish Σpᵢ > 100%; overround = (Σpᵢ − 1) × 100%. No-vig (fair) probability is p̂ᵢ = pᵢ / Σpⱼ, and fair decimal odds are Ôᵢ = 1/p̂ᵢ.

Removing vig does not predict winners—it normalizes prices so you can compare your model to the market baseline. If your estimated win chance exceeds p̂ᵢ, you may have +EV at the posted line (confirm with our expected value calculator).

For a two-way market with decimal odds \(O_1, O_2\):

\[ \hat{p}_i = \frac{1/O_i}{\sum_j 1/O_j}, \quad \text{Vig \%} = \Bigl(\sum_i \frac{1}{O_i} - 1\Bigr)\times 100 \]

Vig % = \(\bigl(\frac{1}{O_1}+\frac{1}{O_2}-1\bigr)\times 100\). Fair probs: \(\hat p_i = \frac{1/O_i}{1/O_1+1/O_2}\).

Worked Example: Standard -110 / -110 NFL Moneyline

Scenario: Both sides priced at -110 (decimal 1.91 each). Enter 1.91 and 1.91 in the 2-way calculator.

No-vig calculation steps for -110 / -110
Step Value Note
Implied prob each side52.36% each1/1.91 per side
Overround (vig)4.72%Fair 50% / 50% after normalization

Each side: 1/1.91 ≈ 52.36% → total 104.72% → vig 4.72%. Fair: 52.36/104.72 = 50% each → fair decimal 2.00 (+100 American). If a book offers +105 on one side, compare to fair +100 to gauge value.

Using Fair Odds to Find Value Bets

After de-vigging, compare p̂ᵢ to your model probability. If you believe Team A wins 54% but fair price implies 50%, the posted line may offer edge—verify with closing line value (CLV) tracking over time.

Line shopping matters: fair odds at Book A can differ from Book B on the same fixture. De-vig both books, then back the side with the better fair price relative to your estimate.

Build a Smarter Pricing Workflow

Confirm +EV with our expected value calculator after you identify an edge vs fair probability.

Convert any posted price to implied % using the implied probability calculator before de-vigging multi-outcome markets.

When books disagree sharply, test arbitrage scenarios—risk-free locks beat thin +EV if execution is clean.

Key Takeaways for Using No-Vig Odds

De-vigging reveals the market's fair baseline—not a pick. Combine fair probabilities with honest models, line shopping, and bankroll discipline. Never chase losses; betting is entertainment for adults 18+ only.

Responsible Gambling

18+ only. Gambling involves risk of loss. Set deposit and time limits, never bet money you cannot afford to lose, and take breaks if betting stops being fun.

Help: BeGambleAware, NCPG (US).

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Educational content reviewed by the OddsGPT Betting Tools editorial team.

Frequently Asked Questions

What is a no-vig (fair odds) calculator?

A no-vig calculator removes the bookmaker’s margin (“vig”) from market odds and converts them into fair odds and implied probabilities. This allows users to see the true probability of each outcome without the built-in house edge, making odds comparison and market analysis more accurate.

Are fair odds the same as no-vig odds?

Yes, fair odds and no-vig odds refer to the same concept. Both describe odds calculated after removing the bookmaker’s margin from the market. These odds represent normalized implied probabilities and are commonly used in analytical models and odds comparison tools.

Why should I remove the vig from betting odds?

Bookmakers include a margin (vig) in their odds to ensure profitability, which inflates the implied probabilities of all outcomes. Removing the vig provides a clearer view of each outcome’s true probability and helps users compare odds across markets or evaluate pricing efficiency.

Why does the total probability exceed 100%?

The total probability exceeds 100% because bookmakers add a margin (vig) to their odds, which inflates the implied probabilities of all outcomes. A no-vig calculator removes this margin and normalizes the probabilities back to 100%, revealing the market’s fair odds.