What Is Vig (Vigorish)?
Vig, also known as juice or vigorish, is the bookmaker’s built-in profit margin. It’s the reason why odds on both sides of a bet don’t add up to a fair market.
The Simple Explanation
In a fair market (coin flip):
- Heads: 2.00 odds (50%)
- Tails: 2.00 odds (50%)
- Total: 100%
In a real bookmaker market:
- Heads: 1.91 odds (52.4%)
- Tails: 1.91 odds (52.4%)
- Total: 104.8%
That extra 4.8% is the vig - the bookmaker’s edge.
Why Remove the Vig?
1. Find True Probabilities
The market’s opinion on actual chances, without the bookmaker’s cut.
2. Identify Value Bets
Compare fair odds to odds offered elsewhere. If another book offers better than fair, you have value.
3. Understand the Real Edge
Know exactly how much the bookmaker is taking from each bet.
4. Compare Bookmakers
See which books have lower margins on specific markets.
How the Calculator Works
Step 1: Enter Bookmaker Odds
Input the odds for all outcomes (2, 3, or more).
Step 2: View Implied Probabilities
See what percentage the bookmaker implies for each outcome.
Step 3: See the Vig
The calculator shows the total margin above 100%.
Step 4: Get Fair Odds
Fair odds are calculated by removing the vig proportionally.
The No-Vig Formula
Calculating Fair Probability
Fair Probability = Implied Probability / Total Implied Probability
Example:
- Outcome A: 1.90 odds → 52.6% implied
- Outcome B: 2.00 odds → 50.0% implied
- Total: 102.6%
Fair probabilities:
- A: 52.6% / 102.6% = 51.3%
- B: 50.0% / 102.6% = 48.7%
Calculating Fair Odds
Fair Odds = 1 / Fair Probability
Example:
- A fair odds: 1 / 0.513 = 1.95
- B fair odds: 1 / 0.487 = 2.05
No-Vig Calculation Examples
Example 1: Two-Way Market (Tennis)
Bookmaker offers:
| Player | Odds | Implied Prob |
|---|---|---|
| Djokovic | 1.40 | 71.4% |
| Nadal | 3.00 | 33.3% |
| Total | - | 104.7% |
Vig: 4.7%
Fair odds:
| Player | Fair Prob | Fair Odds |
|---|---|---|
| Djokovic | 68.2% | 1.47 |
| Nadal | 31.8% | 3.14 |
Insight: If you can get Djokovic at 1.50 or better elsewhere, you have value.
Example 2: Three-Way Market (Soccer)
Bookmaker offers:
| Outcome | Odds | Implied Prob |
|---|---|---|
| Home | 2.10 | 47.6% |
| Draw | 3.50 | 28.6% |
| Away | 3.40 | 29.4% |
| Total | - | 105.6% |
Vig: 5.6%
Fair odds:
| Outcome | Fair Prob | Fair Odds |
|---|---|---|
| Home | 45.1% | 2.22 |
| Draw | 27.1% | 3.69 |
| Away | 27.8% | 3.60 |
Example 3: NFL Spread
Bookmaker offers:
| Team | Odds | Implied Prob |
|---|---|---|
| Chiefs -3 | 1.91 | 52.4% |
| Bills +3 | 1.91 | 52.4% |
| Total | - | 104.8% |
Vig: 4.8% (standard for spreads)
Fair odds:
| Team | Fair Prob | Fair Odds |
|---|---|---|
| Chiefs -3 | 50.0% | 2.00 |
| Bills +3 | 50.0% | 2.00 |
Understanding Vig Levels
Typical Vig by Market Type
| Market | Typical Vig | Bookmaker Type |
|---|---|---|
| NFL/NBA Spreads | 4-5% | Standard |
| Soccer 1X2 | 5-8% | Recreational |
| Tennis H2H | 3-5% | Varies |
| Pinnacle Spreads | 2-3% | Sharp |
| Pinnacle Tennis | 2-3% | Sharp |
| Prop Bets | 8-15% | High margin |
What’s a Good Vig?
| Vig | Assessment |
|---|---|
| < 2% | Excellent (sharp books) |
| 2-4% | Good |
| 4-6% | Average |
| 6-10% | Below average |
| > 10% | Poor (avoid) |
Finding Value Using No-Vig Odds
The Value Formula
Value = (Your Odds / Fair Odds) - 1
Example:
- Fair odds: 2.22
- Book offers: 2.40
Value = (2.40 / 2.22) - 1 = 0.081 = +8.1%
This is an 8.1% edge.
Practical Application
- Calculate fair odds using this calculator
- Shop multiple bookmakers
- Bet when offered odds exceed fair odds
- The bigger the difference, the more value
Power of Closing Line Value (CLV)
The closing line (final odds before event) is considered the most accurate.
Using No-Vig for CLV
- Record the no-vig closing odds
- Compare to odds you bet at
- Calculate CLV:
CLV = (Your Odds / Closing No-Vig Odds) - 1
Consistently positive CLV indicates long-term profitability.
Different Vig Removal Methods
Method 1: Proportional (Default)
Removes vig proportionally based on implied probability.
Fair Prob = Implied Prob / Total Implied Prob
Best for: General use, most markets.
Method 2: Additive (Shin Method)
Assumes vig is distributed based on likelihood of outcome.
Best for: Horse racing, markets with many outcomes.
Method 3: Multiplicative
Assumes equal vig on each outcome.
Fair Odds = Bookmaker Odds × (Total Implied Prob / 100)
Best for: Two-way markets with similar odds.
Comparing Bookmakers Using No-Vig
Example: Same Match, Different Books
Match: Lakers vs Celtics
| Bookmaker | Lakers | Celtics | Total | Vig |
|---|---|---|---|---|
| Pinnacle | 1.93 | 1.97 | 102.6% | 2.6% |
| Bet365 | 1.90 | 1.90 | 105.3% | 5.3% |
| Local Book | 1.85 | 1.85 | 108.1% | 8.1% |
Best value: Pinnacle (lowest vig)
Finding the Best Odds
After calculating fair odds, search for books offering:
- Fair odds or better on your selection
- Lowest margin on the market
Advanced Concepts
Why Sharp Books Have Lower Vig
Sharp bookmakers (Pinnacle, Betfair Exchange):
- Accept larger bets
- Welcome winning players
- Make money on volume, not margin
- Price more accurately
Vig and Expected Value
For a bet to be +EV:
Your Odds > Fair Odds
Or equivalently:
Bookmaker Implied Prob < Your True Prob
Market Efficiency
Betting markets are generally efficient. The no-vig odds represent market consensus on true probability. Beating this requires:
- Superior information
- Better models
- Finding inefficiencies
Common Mistakes
Mistake 1: Ignoring the Vig
Betting without checking the margin costs you money.
Solution: Always calculate vig before betting.
Mistake 2: Assuming All Vigs Are Equal
Different markets have vastly different margins.
Solution: Check vig for each specific market.
Mistake 3: Not Shopping After Calculating
Knowing fair odds is useless without finding better.
Solution: Use odds comparison sites after calculation.
Mistake 4: Using Only One Bookmaker
Single books can’t offer best odds on everything.
Solution: Maintain accounts at multiple books.
Frequently Asked Questions
What is the vig in sports betting?
Vig (vigorish), also called juice, is the bookmaker’s built-in profit margin. It’s why odds on all outcomes add up to more than 100%. For example, -110 on both sides of an NFL spread equals 4.8% vig.
How do I calculate no-vig odds?
First, convert odds to implied probability. Sum all probabilities. Divide each probability by the sum to get fair probability. Convert back to odds: Fair Odds = 1 / Fair Probability.
Why are no-vig odds important?
No-vig odds represent the market’s true opinion on probability. They help identify value bets (when offered odds exceed fair odds), compare bookmaker margins, and understand your real edge.
What’s a typical vig for sports betting?
Standard vig is 4-5% for major markets (NFL/NBA spreads), 5-8% for soccer 1X2, and 2-3% at sharp books like Pinnacle. Prop bets and niche markets often have 8-15% vig.
How do I beat the vig?
Find odds that exceed the no-vig fair odds. Shop multiple bookmakers, use betting exchanges, take advantage of promotions, and focus on markets where you have an informational edge.
Is lower vig always better?
Generally yes, lower vig means better value. However, if you can find odds that exceed fair odds at a higher-vig book, that specific bet still has value. Shop for best odds, not just lowest vig.
Start Calculating Fair Odds
Use our free no-vig calculator above to:
- Select your odds format (decimal, fractional, American)
- Enter odds for each outcome
- Add more outcomes for multi-way markets
- See implied probabilities instantly
- View the total vig/margin
- Get fair (no-vig) odds for each outcome
The calculator removes the bookmaker’s margin proportionally, giving you the true fair odds for any betting market.
Pro tip: Save the fair odds and compare them to odds at other bookmakers. Any book offering better than fair odds represents value.