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Vig breakdown appears here
Enter both sides of any two-outcome market.
Expose the bookmaker's true margin on any market. See no-vig fair odds for both sides instantly — essential for line shopping and EV betting.
Enter both sides of any two-outcome market.
Vig (vigorish), also called juice or overround, is the bookmaker's built-in commission on every bet. It's the reason a perfectly balanced 50/50 market is priced at -110/-110 rather than +100/+100 — both sides lose more than they win in aggregate, with the difference going to the book.
Understanding vig is fundamental to evaluating whether a bet has value. If you always bet into full vig without finding edges, you'll lose at the vig rate over time — roughly 4.5% per bet at standard -110 lines.
Sum the implied probabilities from both sides of the market. Implied probability = 1 ÷ decimal odds. For -110/-110: each side is 52.38%%, total is 104.76%%. The vig is 4.76%%. Enter any two-sided market into this calculator to see the exact margin instantly.
No-vig fair odds strip the bookmaker's margin and show the true probability assessment. They're calculated by dividing each implied probability by the total overround. These fair odds are your best estimate of true win probability when you don't have your own model — and they're what you enter into the EV calculator.
Retail books (DraftKings, FanDuel, BetMGM) charge 4%–5% on mainlines and up to 15% on same-game parlays. Sharp books like Pinnacle charge 1.5%–2% — which is why they're the global reference price. The lower the vig, the easier it is to find +EV bets, and the less you're paying just to participate.
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