Vig / No-Vig Calculator

What is vig (juice)?

Vig — short for vigorish, also called juice — is the commission a sportsbook charges for taking your action. It's baked into every line you see. On a standard NFL ATS bet, both sides are priced at –110, meaning you risk $110 to win $100. If the implied probabilities on each side were fair, they'd sum to exactly 100%. At –110/–110, they sum to about 104.76%. That extra 4.76% is the book's built-in edge — it's what ensures they profit over the long run regardless of outcome.

Understanding the vig on any given line is the first step in evaluating whether a price represents genuine value. A line with 8% juice built in starts you at a significant disadvantage before the game even kicks off.

How to use this calculator

1. Choose your odds format. Toggle between American (e.g. –110) and Decimal (e.g. 1.909) depending on the format your book displays. Switching format converts all existing row values automatically.
2. Enter the odds for both sides. Type in the line for Side A and Side B as listed at your sportsbook. For a standard ATS game this is typically –110 on each side, but any line works.
3. Read the outputs. Vig % shows the book's margin on that game. Prob A / Prob B show the true implied probabilities after removing the juice — these sum to exactly 100%. Fair A / Fair B show what the odds would be at zero vig.
4. Add multiple lines. Use + Add line to compare vig across your full slate or across multiple books offering the same game. The summary row shows your average, highest, and lowest vig across all entries.
5. Use the fair odds for line shopping. If your book has Side A at –115 but the no-vig fair odds are –106, you're paying extra juice. Finding the same side at –108 at another book means you're closer to fair value.

Why no-vig odds matter

The fair odds this calculator produces are the starting point for evaluating closing line value (CLV). If you consistently bet sides at prices better than the no-vig closing line, you're demonstrating a genuine process edge — not just running hot. Conversely, if you're always paying above fair odds, the vig alone is enough to grind your bankroll down over time regardless of your pick accuracy.

No-vig odds are also useful for line shopping. When you know the fair price on a side is –106, getting it at –108 is a meaningful improvement even if –108 still looks like "you're paying juice." Relative to the fair line, you're 2 cents better off — and those 2 cents compound significantly over hundreds of bets.