Vig Calculator
Calculate the sportsbook vig, bookmaker margin, juice, overround, hold, and total implied probability from decimal betting odds. Use it for two-way markets like spreads, totals, props, and moneylines, or add a third outcome for soccer 1X2 markets.
Enter decimal odds. For a two-way -110 market, use 1.91 and 1.91.
Vig Breakdown
| Outcome | Book Odds | American | Implied | Fair Probability | Fair Odds |
|---|---|---|---|---|---|
| Side A | 1.91 | -110 | 52.36% | 50% | 2 |
| Side B | 1.91 | -110 | 52.36% | 50% | 2 |
What Is Vig in Sports Betting?
Vig is the margin built into sportsbook odds. It is the reason both sides of a market can look close to fair while the total implied probability is still greater than 100%.
Bettors also call this cost juice, bookmaker margin, or overround. The words are highly related, but usage varies by market and region. Juice is common for spreads and totals. Overround is common in odds mathematics. Bookmaker margin is the plain-language business term.
This vig calculator answers one question: how much margin is in the market? To remove that margin and calculate fair probabilities, use the No Vig Calculator.
How to Calculate Vig
Implied Probability = 1 / Decimal Odds
Total Implied Probability = Σ Implied Probabilities
Vig / Overround = Total Implied Probability - 1
Hold = Vig / Σ Implied Probabilities
Payout Ratio = 1 / Σ Implied Probabilities
If the total implied probability is 106%, the bookmaker margin is 6%. A bettor pays that margin through worse pricing compared with a zero-margin market.
2-Way Vig and 3-Way Bookmaker Margin Examples
2-Way Vig Example
Team A odds: 1.91
Team B odds: 1.91
1/1.91 = 52.36%
52.36% + 52.36% = 104.71%
The overround, vig, or bookmaker margin is 4.71%. The sportsbook hold is about 4.50%.
3-Way Bookmaker Margin Example
Home: 2.10, Draw: 3.50, Away: 3.80
47.62% + 28.57% + 26.32% = 102.51%
The bookmaker margin is 2.51%. This is a tighter market than many props or futures markets.
Vig vs Overround vs Juice
| Term | Meaning | Common Use |
|---|---|---|
| Vig | The margin embedded in sportsbook odds. | General betting discussion. |
| Juice | Another name for vig, often used for -110 style pricing. | Spreads, totals, props, and US betting slang. |
| Overround | The total implied probability above 100%. | Bookmaker margin calculator and odds math contexts. |
Vig vs No-Vig Odds
A vig calculator measures the sportsbook margin. It tells you how expensive the market is, how much the implied probabilities exceed 100%, and whether one sportsbook is pricing a market more competitively than another.
A no-vig calculator does the next step: it removes that margin and converts the market into no-vig fair probabilities and fair odds. After measuring margin here, open the No Vig Calculator to normalize the same odds.
Why Bookmaker Margin Matters
- Higher margin means worse pricing for the bettor, all else equal.
- Lower margin usually means a more competitive and liquid market.
- Different sportsbooks can post different margins on the same game.
- Main markets often have lower margin than niche props, futures, or low-liquidity markets.
- Margin does not guarantee profit or loss on one bet. It only describes the price structure.
BetAnalytics Product Workflow
Bookmaker Odds
Convert prices into implied probabilities.
Vig / Margin
Measure the sportsbook cost in the market.
No-Vig Fair Probability
Remove margin to create a fair baseline.
Expected Value
Compare your probability estimate to the market.
Kelly Criterion
Size a positive-edge bet conservatively.
BetAnalytics Analysis
Bring the odds context back into match analysis.
Related Tools
No Vig Calculator
Remove sportsbook margin and calculate fair probabilities
Overround Calculator
Measure bookmaker margin across any market
Implied Probability
Convert odds into implied probability before measuring margin
Odds Converter
Convert American, decimal, fractional, and Asian odds formats
Expected Value
Compare your probability estimate against the market price
Kelly Criterion
Size a bet after you have identified a positive edge
Learn More
These topics will be covered in our upcoming Academy section. Check back soon for in-depth educational content.
Sportsbook Margin Basics
Coming SoonUnderstand how vig changes the price you pay to bet
Removing Juice from Betting Odds
Coming SoonTurn sportsbook odds into fair market probabilities
Frequently Asked Questions
- What is vig in sports betting?
- Vig, also called juice or overround, is the sportsbook margin built into the odds. It is why the implied probabilities of all outcomes usually add up to more than 100%.
- Is vig the same as juice?
- Yes in most betting conversations. Vig and juice both refer to the cost built into the price by the sportsbook. Juice is especially common when people talk about point spreads, totals, and -110 pricing.
- Is vig the same as overround?
- They are closely related. Overround is the mathematical total above 100% after adding implied probabilities. Vig is the bettor-facing name for that margin or cost.
- What is a good bookmaker margin?
- Lower is better for bettors. Liquid major markets may be around 2-5%, while niche props, futures, and lower-liquidity markets can be much higher. Always compare prices across sportsbooks.
- How do I calculate vig from decimal odds?
- Convert each decimal odd into implied probability using 1 divided by odds. Add the probabilities together. Vig equals the total implied probability minus 100%.
- What is sportsbook hold?
- Hold measures margin as a share of the total implied probability. A market with a 104.71% implied sum has 4.71% overround and about 4.50% hold.
- How do I remove vig from odds?
- After measuring the vig on this page, use the No Vig Calculator to remove the margin and calculate fair probabilities and no-vig odds.