No-Vig Fair Odds Calculator

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

No-Vig フェアオッズ（別名: devig 計算機）とは何ですか？

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.

オッズを入力 (Decimal)

結果

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

暗黙の確率 公正分析（ビッグなし分析）
両方のオッズに有効な値を入力してください。
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この計算機の使い方

No-Vig フェアオッズ計算機は、オッズからブックメーカーのマージン（vig）を取り除くことで、真の確率と公平なオッズを求めるのに役立ちます。

  • 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.
  • オッズ 1: 最初のオッズを入力
  • オッズ 2: 2番目のオッズを入力

この計算機で表示される内容：

  • 各結果の真の確率（vigなし）
  • 各結果の公平なオッズ（vigなし）

注意: この計算機は、ブックメーカーが市場をバランスさせていると仮定しています。暗黙の確率の合計はvigのために100%を超えますが、この計算機はそのマージンを取り除き、真の確率を表示します。

ヒント＆ベストプラクティス
  • No-Vig 確率を使用して、自分の推定値と比較し価値あるベットを特定してください。
  • 公平なオッズは、ゼロマージン市場で提供されるオッズがどのようなものかを理解するのに役立ちます。
  • 異なるスポーツブック間でNo-Vig オッズを比較して、最良の価格を見つけてください。
  • このツールは、マネーライン、スプレッド、トータルのような2ウェイ市場で最も効果的に機能します。
  • 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.