Vig And Juice Explained

Vigorish — vig, or juice — is the commission a sportsbook builds into its prices. It is the reason a coin-flip bet pays less than even money, and it is the single largest obstacle between a bettor and a profit.

It is also the easiest thing to reduce. Improving your handicapping is hard; paying less vig is a matter of where you place the bet.

How To Calculate It

Convert both sides of a market to implied probability and add them. The excess over 100% is the book's theoretical hold on that market.

A standard -110 / -110 spread: 52.4% + 52.4% = 104.8%. The excess is 4.8%, and the book's expected hold, assuming balanced action, is about 4.55% of total handle.

A -105 / -105 market: 51.2% + 51.2% = 102.4%, roughly half the margin. That difference is enormous relative to any realistic edge — it is the equivalent of improving your win rate by over a full percentage point without getting any better at picking games.

Vig Varies Enormously By Market

The pattern is consistent: the more entertaining a bet feels, the more it costs. The most heavily marketed products on any sportsbook app are the ones with the highest hold, which is not a coincidence.

Reducing What You Pay

Hold accounts at several books. Taking the best available price on every bet is the highest-return habit in betting, and it costs nothing but administration. See line shopping.

Prefer reduced-juice markets. Some books compete on price rather than promotions. A -105 standard price instead of -110 is worth more than any bonus.

Avoid high-hold products. Same-game parlays, alternate lines and novelty props all carry multiples of the standard margin. Occasional entertainment is fine; a strategy built on them is not.

Watch the price, not just the number. A book offering -3 at -105 may be better than one offering -2.5 at -125, and the comparison requires actually doing the arithmetic.

Why Books Do Not Simply Balance Action

The traditional explanation is that a book takes equal money on both sides and collects the margin risk-free. In practice that is rarely how it works.

Modern books are willing to carry substantial one-sided exposure, because they know recreational money is systematically wrong in predictable directions — towards favourites, overs, popular teams and parlays. Rather than balancing, they shade prices towards that flow and accept the risk.

This matters to you because it means prices are not neutral estimates. They are estimates adjusted towards where the public money is, which creates identifiable value on the unpopular side. Understanding the mechanism is covered in how sportsbooks set lines and public betting percentages.

Frequently Asked Questions