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Published September 28, 2023 · Updated September 8, 2026

What Is Vig in Betting? The Margin Inside Every Price

TL;DR

Win exactly half your bets on evenly matched games and you still lose money. The cause is vig, a cut built into every price, and you can pay less of it.

Written and reviewed by Martin Vale, following our methodology.

On this page

Short answer: Vig is the gap between the odds a bookmaker offers and the odds that would be fair. A coin flip is worth 2.00; most books pay about 1.91. That gap is their cut, and you pay it on every bet, win or lose.

Vig is a shorter price, not a separate charge

Picture a tennis match between two players the book rates as even. At a fair price, a dollar on either player wins a dollar. The book pays a little less on both, so every winning ticket comes back short of what the bet was worth. That shortfall is the vig.

Nothing on the betslip says fee, which is why most bettors never notice it: by the time you decide whether you like a price, the margin is already inside it. In Europe it is called margin or overround, Americans call it juice, and the old word is vigorish.

Fair odds pay 2.00, the book pays 1.91 Two bars on one scale. The fair price for a coin flip fills the width; the offered price stops short, and the gap between them is the bookmaker's vig. THE PRICE Fair odds pay 2.00. The book pays 1.91. Fair price 2.00 Offered price 1.91 0.09 of every fair dollar stays with the book On a $100 winning bet that is $9 you never see.
Fair odds pay 2.00, the book pays 1.91 Two bars on one scale. The fair price for a coin flip fills the width; the offered price stops short, and the gap between them is the bookmaker's vig. THE PRICE Fair odds pay 2.00. The book pays 1.91. Fair price 2.00 Offered price 1.91 0.09 of every fair dollar stays with the book On a $100 winning bet that is $9 you never see.
The tennis match above, priced fair and priced by the book.

Where the margin hides

Every price is a claim about probability. Odds of 2.00 say fifty-fifty; odds of 1.91 say about 52 percent. On an American board the same price reads -110: you risk 110 to win 100. Offer 1.91 on both sides of a coin flip and the book is claiming each side is more likely than not, which adds up to more than the whole. That overshoot is the vig, and it is the only place it can be measured from the outside.

The bigger the overshoot, the more the book keeps. A market whose sides add up to just over the whole is tight. One that overshoots by eight or ten points, which is common on player props and accumulators, is expensive. The overshoot never shows on a betslip, but the vig calculator measures it in a second.

The book's percentages add to more than 100 Two equal sides priced at 1.91 each claim 52.4 percent. Stacked on one bar they run past the 100 percent line by 4.7 points, and that overshoot is the vig. WHERE IT HIDES Two sides at 1.91 add up to 104.7% What the two prices claim, side by side Side A 52.4% Side B 52.4% 100% 0% 4.7 points past the whole: the vig Whatever wins, the overshoot is the book's. A fair market adds to exactly 100. Every book adds to more, and the amount is the price of betting there.
The book's percentages add to more than 100 Two equal sides priced at 1.91 each claim 52.4 percent. Stacked on one bar they run past the 100 percent line by 4.7 points, and that overshoot is the vig. WHERE IT HIDES Two sides at 1.91 add up to 104.7% What the two prices claim, side by side 0% 100% Side A 52.4% Side B 52.4% 4.7 points past the whole: the vig Whatever wins, the overshoot is the book's. A fair market adds to exactly 100. Every book adds to more, and the amount is the price of betting there.
Sharp books run a smaller overshoot than this; player props and accumulators often a bigger one.

What vig costs over a season

On one bet the cost looks trivial, a few cents of payout. Over a season it adds up. Bet a hundred dollars a hundred times at that price, pick winners exactly half the time, and you end the season down about $450. Your picks were fine; the price cost you roughly four and a half dollars a bet.

It is also why picking more winners than losers is not enough. At that price you need to win a little more than 52 times in a hundred just to stand still, which is how a bettor can feel like they are winning and still not make money.

A hundred bets at 1.91, winning half of them Stake one hundred dollars one hundred times at 1.91 and win exactly half. Ten thousand goes in, nine thousand five hundred and fifty comes back, and the book keeps four hundred and fifty. OVER A SEASON 100 bets of $100 at 1.91, winning half Staked over the season $10,000 Paid back on 50 winners $9,550 Kept by the book $450 You picked winners half the time and still paid $450. That is the vig, and it never shows on a betslip. To stand still at 1.91 you need to win a little more than 52 times in a hundred.
A hundred bets at 1.91, winning half of them Stake one hundred dollars one hundred times at 1.91 and win exactly half. Ten thousand goes in, nine thousand five hundred and fifty comes back, and the book keeps four hundred and fifty. OVER A SEASON 100 bets of $100 at 1.91, winning half Staked over the season $10,000 Paid back on 50 winners $9,550 Kept by the book $450 You picked winners half the time and still paid $450. That is the vig, and it never shows on a betslip. To stand still at 1.91 you need to win a little more than 52 times in a hundred.
With exactly half your bets winning, only the price decides the book's share. A better price is what shrinks it.

The same margin can sit unevenly

A market's total margin tells you how much the book keeps overall, not how much it charges on the side you want. Books often load more of the margin onto long shots, where casual money goes, and less onto favourites. Two books can show the same total and still give you very different value on the one selection you actually want to back.

How big vig usually is

Pinnacle, which competes on price, states a margin of about 2 percent on Premier League match odds against an industry average it puts at 6 percent. Recreational books sit higher, player props higher still, and accumulators multiply the margin of every leg, which makes them the most expensive product on the shelf.

Betting exchanges work differently. Prices on an exchange come from other bettors and can sit at almost exactly fair; the exchange charges a commission on your net winnings instead. The cost is still there, but it is visible, and you pay it only when you win. Our guide to exchange commission changes shows what happens when that rate moves.

Where you bet How the cut is taken What to watch
Sharp bookmaker Small margin Account limits
Recreational bookmaker Larger margin Promotions
Betting exchange Commission Thin markets

How to pay less

  • Compare the price of your selection across a few books before you bet. The best price on your side is worth more than the tightest book overall.
  • Run a full market through the vig calculator when a price looks generous. The total tells you whether the book is cheap overall or has only moved its margin onto the other side.
  • Prefer single bets to accumulators unless you accept the multiplied margin as the price of the fun.
  • Read every price as a probability before you stake it. A price of 1.91 claims a better than even chance.
  • When two books disagree enough, their margins can leave a gap between them. That gap is what a surebet is.

The formula, if you want it

Turn every price in the market into a percentage by dividing one by the odds, add the percentages up, and subtract the whole. What is left is the margin. To find the fair price of one side, divide its percentage by the total and turn the result back into odds.

Show the working for 4.71% and 2.00

1 / 1.91 = 52.36%

52.36% + 52.36% = 104.71%, so the margin is 4.71%

52.36% / 104.71% = 50%, and 1 / 50% = 2.00 fair odds

The same steps work for a three-way market or a race with twenty runners: every outcome goes in, or the total is wrong. Leaving out the long shots makes any market look tighter than it is.

Frequently asked questions

Is vig the same as juice or overround?

Yes. Vig, vigorish, juice, margin and overround all describe the same cut. Americans say juice, Europeans say margin or overround, and every one of them is the amount by which a market's percentages exceed the whole.

Do I pay vig on a losing bet?

You pay it on every bet, because it is inside the price you accepted. On a losing bet you lose your stake; on a winning bet you are paid less than a fair price would have paid. Exchanges are the exception: their commission is charged only on net winnings.

Can I avoid vig completely?

No. Someone has to run the market. You can pay much less by choosing where and how you bet, and by never accepting a price you have not compared.

Why does the book still make money if I win?

Because it holds both sides. When the money is balanced, the book pays the winners less than it collected from the losers, and the difference is the vig. When the money is not balanced, the margin is still built into every ticket; the book simply carries some risk on top.

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