Vig/Juice Calculator
Calculate the vigorish (juice) a sportsbook charges on any two-sided market. See fair odds and true probabilities with the vig removed.
How Vig Calculation Works
The vig (vigorish or juice) is how sportsbooks guarantee profit. By setting odds so that implied probabilities exceed 100%, the book creates a built-in margin. Understanding the vig helps you evaluate which books offer the best value.
Step 1: Convert to Implied Probability
Convert each side's American odds to implied probability. At -110, the implied probability is 110/(110+100) = 52.38%.
Step 2: Calculate the Overround
Add both implied probabilities. The total (overround) minus 100% gives you the vig. An overround of 104.76% means the vig is 4.76%.
Step 3: Find Fair Odds
Divide each implied probability by the overround to get no-vig (true) probabilities. Convert back to odds format for the fair price of each side.
Frequently Asked Questions
What is the vig (juice) in sports betting?
The vig (short for vigorish, also called juice) is the commission a sportsbook charges on bets. It is built into the odds so that the implied probabilities of all outcomes sum to more than 100%. The standard vig on NFL spreads is about 4.76% (both sides at -110), meaning the book profits regardless of the outcome.
How is the vig calculated?
Convert both sides' odds to implied probabilities and add them together. The amount exceeding 100% is the overround. The vig percentage equals (overround - 1) × 100. For example, -110/-110 gives 52.38% + 52.38% = 104.76%, so the vig is 4.76%.
What is considered a low vig?
A vig below 5% is generally considered low and favorable for bettors. Pinnacle Sports, known as a reduced-juice book, often offers vig around 2-3%. Standard sportsbooks typically charge 4-5% on major markets and 6-10%+ on props and less liquid markets.
How does the vig affect my long-term profitability?
The vig is effectively the cost of placing a bet. A 4.76% vig means you need to win more than 52.38% of your bets at -110 to break even, rather than the 50% you would need at fair odds. Over hundreds of bets, even a small difference in vig compounds significantly. Shopping for the lowest vig is one of the most impactful things a bettor can do.