Sportsbook vig (also called "juice" or "margin") is the built-in commission. On a -110/-110 market, the vig is roughly 4.5%. The wider the vig, the worse the value for the bettor.
Calculate vig
Total vig
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Combined implied prob
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Fair price (Side A)
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Fair price (Side B)
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How vig works
The bookmaker prices both sides of a market with built-in margin. -110/-110 means each side has an implied probability of 52.4%, totaling 104.8%. The 4.8% above 100% is the bookmaker's vig.
What's a "good" vig?
Standard NFL/NBA spreads: 4.5%. Soccer 1X2: 5-8%. Player props: 8-15%. Same Game Parlays: 12-25%. Lower vig = better value.
FAQ
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Yes. We've validated every formula against industry-standard math. The math is the same that pro bettors use.