What Is Vig (or Juice), and Why Does Every Bet Have It?

Every price a sportsbook posts has a built-in fee baked into it. That fee is called vig, short for vigorish, or sometimes juice — the sportsbook’s cut for taking your action. It’s not a separate line item you see on your bet slip; it’s folded directly into the odds themselves, which is exactly why so many bettors never notice it’s there.

How vig gets baked into the odds

Think about a bet with two possible outcomes — close to a coin flip. If a sportsbook priced that market with no cut for itself, both sides would pay true even money. Instead, you’ll typically see both sides priced at something like -110, meaning you risk $110 to win $100 no matter which side you take.

That’s the tell. Convert -110 to an implied probability — the win rate the price is suggesting — and you get roughly 52.4%, not 50%. Do that conversion for both sides of a two-way market and the two implied probabilities add up to more than 100%. That extra slice above 100% is the vig. It’s also called the hold or the overround, and it’s how the book gets paid regardless of which side wins.

A simple example

Say a market has two sides, each priced at -110 (illustrative round numbers, not a posted line). Each side converts to about a 52.4% implied win rate. Add the two together and you get roughly 104.8% — not the 100% you’d expect from two outcomes that must sum to certainty between them.

That extra 4.8% is the built-in margin. Strip it back out proportionally and you’d land on the no-vig price — the “fair” line the market is really suggesting once the sportsbook’s cut is removed. The gap between -110 and that fair number is the vig, sitting quietly inside a price that looks like a coin flip but isn’t quite priced like one.

Why vig makes long-run winning hard

At standard -110 pricing, you don’t need to win 50% of the time to break even — you need to win closer to 52.4%, just to cover the fee built into every single bet. That gap between 50% and the breakeven number is the whole reason vig matters: it’s not a one-time cost, it’s a toll that applies to every bet, every time, win or lose.

Wider markets — same-game combinations or long player-prop menus, for example — often carry more built-in margin than a simple two-way line, because there are more outcomes for a book to price and more room to work vig into each one. That’s part of why bundling several bets together is harder to come out ahead on than it looks: you’re not just fighting the odds of each piece landing, you’re fighting a bigger fee stacked on top.

How to spot it and think about it clearly

You won’t always see vig spelled out, but you can usually feel where it’s heavier: any market where the priced probabilities add up to noticeably more than 100% has margin built in. The tighter that gap, the closer to a fair market you’re looking at; the wider it is, the more you’re paying to make the same bet.

Vig doesn’t make betting bad, and it isn’t unique to any one sportsbook — it’s the toll every bet pays to exist, and every book builds it in somewhere. The goal isn’t to eliminate it, since you can’t; it’s to see it clearly, so a price doesn’t read as more favorable than it actually is. If you want to get comfortable reading the raw numbers a price is built from before vig or parlay math enters the picture, how to read American odds is a good place to start. And if you want to see how a full set of legs actually prices out, the parlay analyzer lays that math out leg by leg, and the parlay calculator will run the numbers for a specific ticket.