Juice and Vig — How the House Edge Works in MLB Betting
A standard -110/-110 market gives sportsbooks a 4.55% edge; a -115/-105 split drops it to about 3.2%. Here's why line shopping matters every single day.
The vig — also called juice — is the commission baked into every line a sportsbook posts, and in a standard MLB market priced at -110 on both sides, it hands the house a 4.55% edge on every dollar wagered. Drop that split to -115 / -105 and the edge falls to roughly 3.2%. That gap compounds quickly over a full 162-game season, which is why line shopping belongs at the center of any serious MLB betting strategy.
What exactly is the juice in a baseball betting line?
When a sportsbook posts a game total at Over -110 / Under -110, neither side pays true even money. To profit $100 on the Over you must risk $110. That extra $10 is the vig. Because the book collects it from both sides, it profits regardless of outcome — assuming balanced action — and that structural advantage is the house edge.
The math works like this: at -110 / -110, a bettor wins 52.4% of the time just to break even. Win anything less and the vig eats the margin. Understanding this is the foundation of how MLB betting works at a mechanical level.
How does the house edge change across different line splits?
| Line split | House edge (approx.) | Break-even win rate |
|---|---|---|
| -110 / -110 | 4.55% | 52.4% |
| -115 / -105 | 3.2% | ~51.2% on the -115 side |
| -130 / +110 | Varies; favorite side carries more vig | Favorite ~56.5%, dog ~47.6% |
Why does this matter for MLB moneyline bets specifically?
MLB moneylines price each side between roughly -130 and +120 in a competitive game. At those numbers the implied probabilities still sum to more than 100%, and the excess is the book's margin. Before picking a side, check what American-format lines mean in plain English so you know exactly how much vig you're absorbing.
The practical fix is line shopping — comparing the same game across DraftKings, FanDuel, BetMGM, and others before placing a bet. A single point of juice difference (-110 vs. -109) seems trivial, but over hundreds of wagers across a season it is meaningful. Our comparison of the best MLB sportsbooks covers which books tend to offer tighter lines on baseball.
Does vig hit harder on parlays?
Yes — substantially. Combining three -110 legs into a parlay multiplies the house edge so the book holds roughly 12% on the ticket. That is why we treat MLB parlay picks as entertainment spending rather than a primary strategy. The payout looks attractive; the embedded vig is the hidden cost.
How to reduce the house edge on your MLB bets
- Shop lines across multiple licensed sportsbooks before every bet.
- Prefer -105 or reduced-juice markets where available over standard -110 lines.
- Avoid heavy favorites at short moneylines where the vig-to-potential-profit ratio is worst.
- Track your bets — knowing your actual win rate versus the required break-even rate reveals whether variance or skill is driving results.
- Check which states allow legal online betting to ensure you're using a licensed, regulated book that posts transparent lines.
Bonus terms add another layer: per standard operator language, bonus bets at major sportsbooks often expire within 7–14 days, and MLB bets at odds shorter than roughly -200 to -300 may not qualify for bonus clearing. Read MLB sportsbook bonus terms before claiming any offer. Must be 21+ (18+ in NH and WY). Gambling problem? Call 1-800-GAMBLER.
The juice and vig are the single most controllable cost in MLB betting. Every other variable — pitcher performance, weather, lineup changes — is uncertain. The house edge is fixed and knowable in advance, which makes minimizing it the clearest edge available to any bettor building a disciplined approach to the game.