Vig, Juice and the Overround
WeBall3 min readUpdated Aug 15, 2026Reviewed Aug 15, 2026
Sportsbooks do not charge a commission you can see. They charge it by pricing both sides of a market slightly worse than they believe is fair, and keeping the difference. That difference is the vig — also called juice, or the overround when you are talking about the total.
Measuring it
Convert both sides to implied probability and add them. Anything over 100% is the margin.
Standard spread pricing
- 01Both sides at −110.
- 02Each implies 110 ÷ 210 = 52.38%.
- 0352.38% + 52.38% = 104.76%.
- 04Subtract 100%.
The hold calculator does this for any two prices, including lopsided markets where the arithmetic is less obvious.
What it costs you
Vig is not an abstraction — it is the hurdle every bet has to clear. At −110 you break even at 52.4%, not 50%. Those 2.4 percentage points are the entire reason most bettors lose: they are not bad at picking, they are betting into a tax they never accounted for.
4.76%
Vig at −110 / −110
The standard two-way market
52.4%
Breakeven win rate
Not 50%
2.4pts
The gap you must beat
Every single bet
Vig varies enormously by market
This is the part most bettors never internalise. Hold is not a fixed cost of betting — it is a wildly variable one, and choosing which markets to bet is largely choosing how much to pay.
| Market type | Typical hold |
|---|---|
| Main spreads and totals | 4–5% |
| Moneylines on close games | 3–5% |
| Reduced-juice lines | 2–3% |
| Player props | 6–10% |
| Alternate lines | 6–12% |
| Same-game parlays | 15–25%+ |
| Long-shot futures fields | 20–40% |
A bettor with a genuine 3% edge is profitable on a 4% main line and badly unprofitable on a 12% alternate line, with exactly the same handicapping ability. The market choice did all the work.
Why futures look so generous and are not
Add up the implied probabilities of every team to win a championship and you will often get 130% or more. Spread across a field of 30 teams, an enormous overround hides comfortably — each individual price looks reasonable while the market as a whole is brutal.
This is also why futures tie up money for months at bad prices. The book is holding a large margin and you are financing it.
Removing it
To judge a bet you need the market's opinion without the fee. Convert both sides to probabilities, add them, and divide each by the total so they sum to exactly 100%. That gives the no-vig fair odds, which is the only number worth comparing your own estimate against.
This is exactly what WeBall's engine does before grading anything: the fair price comes from cross-book consensus with the vig normalised out, and the published edge is measured against that, never against the posted price.
Common questions
What is a normal amount of vig?
On main lines at competitive books, 4 to 5% and sometimes as low as 2%. Player props commonly run 6 to 10%. Same-game parlays and long-shot markets can exceed 20%. The number varies more by market type than by sportsbook.
Does a lower-vig book always give the better price?
Usually but not always. A reduced-juice book might price a specific market worse than a standard book that happens to be off on that game. Low hold tells you where to look; it doesn't remove the need to compare the actual number.