Vig/Margin Calculator
Enter the odds for any market to see the bookmaker's built-in edge, true probabilities, and no-vig fair odds.
Enter Market Odds
Bookmaker Margin
5.85%
Total Overround
105.85%
Fair market = 100%
| Outcome | Offered Odds | Implied Prob | True Prob | No-Vig Odds |
|---|---|---|---|---|
| Home/Outcome 1 | 1.90 | 52.6% | 49.7% | 2.01 |
| Draw | 3.40 | 29.4% | 27.8% | 3.60 |
| Away/Outcome 2 | 4.20 | 23.8% | 22.5% | 4.45 |
What Is the Vig (Vigorish)?
The vig (also called juice, margin, or overround) is how bookmakers guarantee profit regardless of the outcome. They set odds so that the implied probabilities add up to more than 100%. For a full breakdown of how odds encode probability, see our betting odds guide.
For example, a fair coin flip should be 2.00 vs 2.00 (50% + 50% = 100%). A bookmaker might offer 1.90 vs 1.90 (52.6% + 52.6% = 105.2%), keeping a 5.2% edge.
Understanding the margin is essential for finding value bets. You need to identify markets where the true probability exceeds the bookmaker's implied probability. Pair this tool with the Value Bet Calculator to quantify your edge.
Typical Bookmaker Margins
| Market Type | Typical Margin | Rating |
|---|---|---|
| EPL 1X2 | 3-5% | Good |
| Over/Under 2.5 | 4-6% | Good |
| BTTS (GG/NG) | 5-8% | Fair |
| Correct Score | 10-20% | High |
| Live Betting | 8-15% | High |
| NPFL / Niche Leagues | 8-12% | Fair |
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