What is the vig in sports betting?

Q: What is the vig in sports betting?

The vig, also called the juice, is the sportsbook's commission. It is built into the odds instead of charged as a separate fee. At standard -110 pricing on both sides, each side implies 52.38%, so the two add up to 104.76% in a market that can only hold 100%. That extra 4.76% is the fee, and it means you need to win 52.38% of your bets just to break even.

Odds & Math

3 diagrams•4 min read•Updated Aug 20, 2026

Written by VIMB

Short answer

The vig is a fee hidden inside the odds. At -110 it means you need to win 52.38% of your bets just to break even, not 50%.

Every bet you place already has a fee attached to it. You never see it, it never shows up on your slip, and it is the single biggest reason bettors who pick winners about half the time still end up down money.

That fee is called the vig. Once you see how it works you can't unsee it, and by the end of this you'll know the exact number you have to beat before you make a single dollar.

Start with a coin flip

Heads or tails. 50/50, nothing complicated. If a sportsbook priced that honestly, both sides would sit at +100. Bet $100 on heads and win $100. Bet $100 on tails and win $100. Over enough flips the book makes exactly nothing.

So that is not what they do. Both sides get priced at -110 instead. You risk $110 to win $100, on heads and on tails.

Where does the vig money actually go?

Straight to the book, and it doesn't matter who wins.

Every price is really a probability wearing a costume. -110 works out to 52.38%. Both sides are priced at -110, so the book is telling you heads is a 52.38% shot and tails is a 52.38% shot. Add those together and you get 104.76%.

There is no such thing as a 104.76% market. Nothing can be more than 100% certain. That extra 4.76% was never a probability at all. It's the fee.

A -110 / -110 marketTwo sides that can only add to 100%, priced to add to 104.76%.

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What the vig actually costs you

Say you flip a coin 100 times and bet $110 on it every single time at -110. You get exactly half of them right, which is what should happen with a coin.

50 wins pay $100 each = +$5,000. 50 losses cost $110 each = −$5,500.

You performed exactly as expected and you are down $500.

You wagered $11,000 to lose $500. That's 4.55% of everything you put through the book. Nothing went wrong here. You didn't tilt, you didn't chase, you didn't run bad. That's just the fee, collected quietly, bet after bet after bet.

What the fee costs a coin flipperFlat $100 bets at -110, with no edge either way.

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The number you actually have to beat

This is why 50% is not break even.

At -110 you need to win 52.38% of your bets just to come out flat. Not to profit. To break even. That gap between what feels fair and what actually pays is where the sportsbook lives, and it's why someone can be right more often than they're wrong and still watch their balance drip down every month.

Price by priceSmall differences in juice are big differences in the win rate you need.

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Not every bet is priced the same

This part is worth real money to you. Main lines on the big leagues are the tightest prices a book offers, usually right around that -110. That's the cheapest thing on the menu.

Player props, alternate lines and same game parlays carry a lot more juice than the main line. Same game parlays especially. The book knows those are the fun bets, and the fun bets cost more.

And the price is only half of it. A book that offers a great number and then cuts your limits the moment you start winning is charging you in a different currency.

What to do with this

▸Know your break-even number before you place the bet. At -110 it's 52.38%.

▸If someone is selling picks that hit 51%, they're selling you a losing product with a winning record.

▸Shop your prices. -110 to -105 looks like nothing and it drops your break-even from 52.38% to 51.22%. Over a season that's real money.

▸Stop treating a 50% win rate as breaking even. It isn't, and it never was.

Next question: if the price includes the book's fee, what does the book actually think is going to happen? You can work that out, and it takes about thirty seconds.