Understanding Vig: How Sportsbooks Make Money on Every Bet

If sports betting were fair (no margin), every bet would be priced at exactly the implied probability of the outcome and the house would break even. It isn't, and they don't. Books bake in a margin called vig, juice, or hold. Understanding what it is, where it shows up, and how to recognize a high-vig wager is foundational to betting profitably.

The math

Take a standard two-way market: -110 / -110. The implied probability of -110 is 52.38 percent (use our implied probability calculator to verify). The two sides sum to 104.76 percent. The 4.76 percent over 100 percent is the book's hold.

That 4.76 percent is the book's expected return per dollar of two-way action. If a book takes balanced action on both sides of a -110/-110 market, it pays out fewer dollars than it takes in by exactly 4.76 percent. That's how books make money on every bet.

Why books do this

Books need a margin because their forecasts aren't perfect. They sometimes take heavier action on the wrong side. Sharp money sometimes moves prices unfavorably. Hold is the cushion that absorbs forecast errors and keeps the book profitable on average.

It's also why books prefer balanced action: when both sides have equal stakes, hold guarantees profit. When action is one-sided, the book has inventory risk; the hold is supposed to compensate, but actual outcomes can vary.

Hold by market type

Hold isn't constant across markets:

• NFL spreads and totals: roughly 4 to 5 percent at major U.S. retail books.
• NBA, NHL, MLB main markets: 4 to 5.5 percent.
• Soccer 1X2 markets: 5 to 7 percent.
• Player props: 6 to 10 percent per pair.
• Same-game parlays: often 15 percent or more, depending on correlation.
• Futures with many entrants: 15 to 30 percent.
• Exotic markets (e.g., player to score 5+ touchdowns): can exceed 20 percent.

Use the hold calculator to compute hold on any market you're considering. The number tells you how much edge the book has built in.

Hold by book

Books position themselves on the hold spectrum. Reduced-juice operators (LowVig, BetOnline, occasionally Pinnacle for non-U.S. customers) compete on lower hold, often 4 to 4.5 percent on main markets. Major U.S. retail books (DraftKings, FanDuel, BetMGM, Caesars) typically run 4.5 to 5.5 percent on main markets. Recreational-focused books with weaker price competition can run 6 percent or higher even on main markets.

The same book can have very different hold across markets. Many U.S. retail books are competitive on NFL spreads but carry much higher hold on NBA props. The practical answer is to compare each market individually.

How vig affects your bottom line

Hold determines the win rate you need to break even. A wager priced at -110 needs you to win 52.4 percent of the time to break even. At -120, you need 54.5 percent. At -105, you need 51.2 percent. Small percentage point differences in price translate into big percentage point differences in required win rate.

Across many wagers, the cumulative effect of paying high vig instead of low vig dominates almost every other decision a recreational bettor makes. A bettor who takes -120 prices when -110 is available ends up needing a 2.1 percentage point higher win rate just to break even. That's an enormous difference.

Recognizing high-vig wagers

Some markets are structurally high-vig. Avoid them or limit your exposure:

• Same-game parlays without a clear correlation insight.
• Multi-team teasers (the moved points come at meaningful cost).
• Boost-of-the-day markets (often "boosted" from already high-hold lines).
• Long-shot futures with sums of implied probabilities far above 100 percent.
• Exotic player-prop combinations (e.g., player to score and team to win).

None of these are inherently bad bets. But they all carry meaningfully more book margin than main markets, so the bar for placing them should be higher.

How to fight vig

The two most effective tactics:

1. Line shop. Different books have different hold on the same market. Taking the better price reduces effective vig. Use MatchupOdds to find the lowest-vig book on each individual market.
2. Stick to main markets. The lowest-hold markets are where the biggest U.S. books compete on price. Player props and same-game parlays carry more vig and require more skill to bet profitably.

For deeper coverage, see our pieces on why odds differ between books and why line shopping matters more than you think.

The bottom line

Vig is the most important number in sports betting that recreational bettors ignore. It determines the break-even win rate every bet requires, varies by market and by book, and compounds across every wager you place. Understanding it doesn't make you a sharp; ignoring it makes you a customer.