Vig Calculator
Calculate bookmaker margin and find no-vig fair odds
Calculate Sportsbook Vig
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What is Vig (Juice)?
The vig (also called juice, margin, or overround) is how sportsbooks make money. It's built into the odds so that no matter which side wins, the book profits on average.
For example, a standard -110/-110 line means you need to bet $110 to win $100 on either side. If equal money is bet on both sides, the book collects $220 and pays out $210 to winners, keeping $10 (about 4.55% margin).
Want this stripped automatically across every market? See how our no-vig math compares as an OddsJam alternative.
Why Vig Matters
Understanding the vig helps you:
Find fair odds - Know the true probability implied by the market
Compare sportsbooks - Lower vig means better long-term returns
Identify value - If you think an outcome is more likely than the fair probability, you may have found value
Common Vig Examples
| Odds | Combined Implied | Vig | Fair Odds | Rating |
|---|---|---|---|---|
| -105 / -105 | 102.44% | 2.44% | +100 / +100 | Excellent |
| -108 / -108 | 103.70% | 3.70% | +100 / +100 | Good |
| -110 / -110 | 104.76% | 4.76% | +100 / +100 | Standard |
| -115 / -105 | 105.20% | 5.20% | -103 / +103 | Average |
| -120 / +100 | 105.45% | 5.45% | -108 / +108 | Below Average |
Note: The fair odds assume equal probabilities (50/50). Actual fair odds depend on the true likelihood of each outcome.
Vig Calculator FAQs
How is vig calculated?
First, convert both odds to implied probabilities: Implied Prob = 1 / Decimal Odds. Then add them together. The amount over 100% is the vig. For -110/-110: (52.38% + 52.38%) - 100% = 4.76% vig.
What is a good vig?
For point spreads and totals, 4-5% is standard (-110/-110). Under 4% is excellent, and some reduced juice books offer -105/-105 (2.44% vig). For moneylines, vig varies widely based on the mismatch between teams. Prop bets often have the highest vig (8-15%+).
How do I remove the vig to find fair odds?
Divide each implied probability by the total implied probability, then convert back to odds. For -110/-110: Fair prob for each side = 52.38% / 104.76% = 50%. 50% probability = +100 or 2.00 decimal odds.
Why do sportsbooks charge different vig?
Vig varies by market competitiveness, bet type, and sportsbook strategy. High-volume markets (NFL spreads) have lower vig due to competition. Niche markets (player props, obscure sports) have higher vig because there is less shopping available and more uncertainty.
What about 3-way markets (soccer, NHL regulation)?
This calculator is designed for 2-way markets. For 3-way markets (win/draw/win), you would add the implied probability of all three outcomes and calculate vig the same way. The total will exceed 100%, and you divide each probability by the total to find fair odds.
Using No-Vig Odds to Find Value
The "No-Vig" Line
The no-vig (or "fair") line represents what the market implies about true probabilities, without the sportsbook's cut. This is useful for:
Setting your own probability benchmarks
Identifying which side has more value
Comparing odds across different sportsbooks
If you find odds better than the no-vig line at any book, that's a sign you're getting a good price on that side of the market.
Example Analysis
Market Odds: Chiefs -150 / Bills +130
Implied Probabilities: 60% + 43.5% = 103.5%
Vig: 3.5%
Fair Probabilities: Chiefs 57.97%, Bills 42.03%
Fair Odds: Chiefs -138, Bills +138
If you can find Chiefs -138 or better, or Bills +138 or better anywhere, that's beating the market consensus.
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