The Standard -110 Explained
The most common odds format you'll see in US sports betting is -110 on both sides of a point spread or total. Most bettors think this means a roughly even game — but it doesn't mean you're getting fair odds.
At -110, you must bet $110 to win $100 profit. If two bettors each wager $110 on opposite sides, the sportsbook collects $220 and pays out $210 to the winner — keeping $10 regardless of who wins. That's the juice.
-110/-110 market (standard spread or total)
Bettor A: $110 on Team A | Bettor B: $110 on Team B
Book collects: $220 | Pays winner: $210 | Book keeps: $10
Book's margin: $10/$220 = 4.55% on every dollar wagered
How to Calculate the Vig
-110/-110 line:
Each side: |−110| / (110 + 100) = 52.38%
Total: 52.38% + 52.38% = 104.76% | Overround = 4.76%
Vig ≈ 4.55% — the book earns 4.55 cents per dollar wagered
Vig on Different Bet Types
The standard -110 line carries about 4.55% vig, but this varies significantly by market type:
Sides and totals at major books: typically 4–5%. Moneylines on heavy favorites: often 5–8% because implied probs are harder to read. Player props: 7–12% — books have huge information advantages here. Same-game parlays: 15–25%+ due to correlation mispricing in the book's favor. Parlay legs: each leg compounds the vig, making 5+ leg parlays extremely -EV.
Why Vig Makes Beating the Book Hard
A bettor betting -110 on both sides equally must win 52.38% of bets just to break even. That's the break-even rate after vig. A bettor at 50% accuracy loses money — even though they're right half the time. To profit, you need to exceed the break-even threshold consistently, which requires a genuine edge in predicting outcomes.
Sharp Books vs Recreational Books
Not all sportsbooks charge the same vig. Sharp books like Pinnacle historically run 2–3% margins and take action from winning bettors. Recreational books run 5–7% and limit or ban sharp bettors. Identifying where you get the best line — and the lowest vig — is part of a serious betting strategy.
Sibyl Tracks the Best Lines Across Books
Every pick in the Sibyl dashboard includes the best available price across major sportsbooks — so you always minimize vig while maximizing edge.
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