What Is Vig in Football Betting?
Vig, also called juice, is the sportsbook's built-in commission on a betting market. Standard football spreads and totals are often priced at -110 on both sides, which means a bettor risks $110 to win $100. The extra risk is not part of the prediction. It is the cost of placing the bet at that price.
On a true 50/50 market with no vig, both sides would be +100. A -110/-110 market converts to 52.38% implied probability on each side. Added together, the market shows 104.76% instead of 100%. That extra 4.76 percentage points is the overround, and it translates to a 4.55% house edge.
The Break-Even Number: 52.38%
At -110 odds, a bettor must win 52.38% of bets to break even.
A 52% win rate still loses money at standard juice. A 53% win rate can be profitable, but only if the average price stays close to -110.
For a single-side odds conversion, use the Implied Probability Calculator. This vig calculator is better when both sides of a market are available and the goal is to remove the book's margin.
Why Vig Changes the Bet
- Break-even rate: The worse the price, the more often the bet has to win before it becomes profitable.
- Point buying: Moving a football spread from -3 to -2.5 may raise the price from -110 to -125. The half point has to be valuable enough to justify the higher break-even rate.
- Line shopping: A move from -110 to -105 looks small, but it lowers the required win rate from 52.38% to 51.22%.
- Market comparison: Removing vig makes it easier to compare a spread, total, or moneyline against a bettor's own probability estimate.
Vig Levels for Football Bettors
| Odds | Breakeven Win % | House Edge | Verdict |
|---|---|---|---|
| -105/-105 | 51.22% | 2.38% | Great (Low Juice) |
| -108/-108 | 51.92% | 3.70% | Good |
| -110/-110 | 52.38% | 4.55% | Standard |
| -115/-105 | 52.17% / 51.22% | 4.85% | Acceptable |
| -115/-115 | 53.49% | 6.52% | Expensive (Avoid) |
| -120/-100 | 54.55% / 50% | 6.67% | Expensive (Avoid) |
How to Use the Vig Calculator
Enter the odds for both sides of the same market, such as Chiefs -3.5 and Raiders +3.5, or Over 47.5 and Under 47.5. The calculator converts each price to implied probability, totals the market, then removes the extra margin above 100%.
The fair odds output shows what each side would be priced at without juice. If one sportsbook posts -110/-110 and another posts -105/-105 on the same line, the reduced-juice book gives a lower break-even point before any opinion about the game is even considered.
Finding Better Lines
Not all sportsbooks charge the same vig. Shopping for better odds is one of the easiest ways to improve long-term betting results because the same pick can have a different expected return at a different book.
| Book Type | Typical Vig | Best For |
|---|---|---|
| Pinnacle | 2-3% | Sharp bettors, high limits |
| Circa Sports | 3-4% | Vegas locals, contest players |
| BetOnline (-105 program) | 2.5% | Reduced juice seekers |
| DraftKings / FanDuel | 4-5% | Promos, boosts, SGPs |
| Local book | 4-10% | Convenience, credit |
The Math on Line Shopping
Assume 100 NFL bets in a season at $100 per game and a 50% win rate. The price alone changes the result:
- At -105: Lose $488
- At -110: Lose $1,000
- At -115: Lose $1,535
That is a $1,047 gap between the best and worst juice. Same bets, same outcomes, different sportsbooks.
When the market involves a point spread, compare the implied moneyline value with the Spread to Moneyline Converter before deciding whether the price is worth paying.
Vig Formulas
The calculator starts by converting each set of odds into implied probability. If the two probabilities add up to more than 100%, the amount above 100% is the sportsbook overround. The house edge expresses that overround as a share of the total market.
The no-vig probability is not a prediction by itself. It is the market's price after removing the sportsbook margin, which makes it a cleaner benchmark for comparing lines.
Comparing football prices without mixing snapshots
Vig comparisons are meaningful only when both prices describe opposite sides of the same market at approximately the same time. A favorite price copied before an injury update and an underdog price copied afterward do not form a real two-sided book. Save the teams, spread or total, sportsbook, timestamp, and whether the quote is an opener, current line, or closing price.
A lower overround generally gives the bettor a better pricing environment, but it does not say which side is more likely to win. Compare the same selection across books after confirming that push rules, overtime treatment, limits, and promotional restrictions match. When a line differs as well as the price, the comparison is no longer a pure vig question because the two tickets win and lose on different outcomes.
For repeated wagers, small price differences accumulate. Calculate break-even probability at each quote and keep stake convention consistent—risking $110 to win $100 is not the same notation as staking $100 at -110. The no-vig split remains a market-derived benchmark rather than an independent forecast.
Questions about Vig Calculator
What does vig measure?
Vig describes the margin embedded in the entered market prices. In a two-sided market, the raw implied probabilities commonly sum to more than 100%.
What is the break-even rate at -110?
American odds of -110 correspond to an implied break-even probability of about 52.38% before considering pushes or unusual settlement terms.
Are no-vig probabilities predictions?
No. Normalizing the market removes overround mathematically; it does not make the market correct or replace an independent forecast.
Why should both sides come from the same timestamp?
Using prices observed at different times can create an artificial margin or no-vig split that never existed in the market.