Sports Betting
No Vig Odds Calculator
Remove the bookmaker margin from American, Decimal, or Fractional odds to reveal fair probabilities and fair odds for 2-way and 3-way markets.
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About this calculator
Method, formulas, and limits.What this does
Removes the built-in bookmaker margin (vigorish) from American, Decimal, or Fractional betting odds to reveal the true implied probabilities and fair market odds. It supports both 2-way markets like moneyline bets and 3-way markets like win-draw-wins. The calculator also detects arbitrage opportunities when the total implied probability drops below 100%.
Who it is for
Sports bettors, odds traders, and analytics enthusiasts who want to understand the true probability behind posted odds, compare fair lines across sportsbooks, or identify arbitrage opportunities in any sport.
How it works
Enter the odds for each outcome (2 or 3 outcomes depending on the market), and the calculator converts them to decimal format, then to implied probabilities. It sums all implied probabilities to find the overround (the vig). Each implied probability is divided by the total to get the no-vig (true) probability, which is then converted back into fair American and Decimal odds. If the total is under 100%, an arbitrage alert is shown.
Limitations
Assumes the market is efficient and that the bookmaker's margin is distributed proportionally across all outcomes—not uneven shading. Does not account for line movement, closing line value, or sportsbook-specific adjustments like reduced juice or promo pricing.
Key calculations
- Odds to Decimal
- American odds are converted to decimal: positive odds = (american / 100) + 1, negative odds = (100 / |american|) + 1. Fractional odds: fractional + 1.
- Implied Probability
- Each outcome's decimal odds are inverted to find the bookmaker's implied probability. impliedProbability = 1 / decimalOdds
- No-Vig (True) Probability
- Each implied probability is divided by the total overround to remove the bookmaker margin. trueProbability = impliedProbability / totalImpliedProbability
- Fair Odds and Vig Percentage
- Fair decimal odds are the inverse of the no-vig probability. vigPercentage = (totalImpliedProbability - 1) × 100. A negative vig means arbitrage.
Reference ranges
- Vig Percentage
- Standard sportsbook vig is 3-5% for NFL and NBA moneylines, 4-6% for MLB, and 5-8% for soccer 3-way markets. Reduced juice books offer 1-2% vig.
- Total Implied Probability
- A typical 2-way market has total implied probability of 102-105%. 3-way markets often run 105-110%. Below 100% is an arbitrage opportunity.
- Arbitrage Edge
- Usable arbitrage opportunities are rare and typically offer 0.5-2% edge. Above 3% is exceptional but requires quick execution before lines adjust.
- Fair Odds Shift
- Removing vig typically shifts odds by 5-15 cents on the American line for standard markets. Heavier vig (e.g., 8%+) produces larger shifts.
How to use it
- 1.Select the odds formatChoose American (+150, -200), Decimal (2.50), or Fractional (3/2). The calculator auto-detects the format as you type if you leave it on the current setting.
- 2.Choose the market typeSelect 2-way for two-outcome markets (moneyline) or 3-way for three-outcome markets (win-draw-win or spread + moneyline).
- 3.Enter outcome labels and oddsCustomize each outcome label (e.g., Team A, Team B) and paste or type the odds. The calculator auto-detects the format for each entry.
- 4.Review the fair odds outputThe results panel shows each outcome's implied probability, no-vig true probability, and fair American and Decimal odds side by side.
- 5.Check for arbitrageIf the total implied probability is below 100%, an arbitrage alert appears with your guaranteed profit edge.
- 6.Share or download resultsUse the Share button to copy a URL with your current odds state, or Download to save a formatted HTML report of the full analysis.
Vig (short for vigorish) is the bookmaker's built-in margin that ensures they profit regardless of the outcome. It appears as odds that don't sum to 100% implied probability. For example, if both sides of a -110 / -110 moneyline are implied at 52.38% each, the total is 104.76%—the extra 4.76% is the vig.
Convert all odds to implied probabilities, sum them, then divide each probability by the total. The result is the true probability without the bookmaker's margin. The calculator does this instantly—just enter the posted odds and the no-vig probabilities and fair odds appear automatically.
No vig means the odds have been adjusted to remove the bookmaker's margin, showing the fair market price for each outcome as if the bookmaker took no cut. These are the true odds you would see in a zero-margin market, which helps you assess whether a bet has positive expected value.
Yes. If the total implied probability is less than 100%, it indicates an arbitrage opportunity where you can bet on all outcomes and guarantee a profit. The calculator highlights this with an alert and shows your arbitrage edge percentage so you can evaluate the opportunity quickly.
American (+150, -200), Decimal (2.50), and Fractional (3/2). The calculator can also auto-detect the format when you paste odds, so you can mix formats if needed and it will normalize everything for the analysis.
Yes. The math is the same regardless of sport. Use it for NFL, NBA, MLB, soccer, tennis, or any market with 2 or 3 outcomes. The calculator handles point spreads, moneylines, totals, and three-way soccer odds equally well.
Arbitrage opportunities are short-lived—often minutes or seconds. If you are actively looking, check odds across multiple sportsbooks frequently using this calculator alongside odds comparison tools. The calculator's share feature lets you save a snapshot of a line for later review.
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