What the Vig Is and How Sportsbooks Make Money on Baseball

By 4Baseball Staff · November 5, 2026 · 12 min read

The vig, also called the juice, is the sportsbook's built-in margin. Worked examples show how a -110 line costs a bettor 4.5 percent, how parlays compound it, and why baseball lines use dime and 20-cent spreads.

Every betting line on a baseball game carries a fee that is not printed anywhere on the ticket. It is built into the price. When a sportsbook offers you either side of a game at -110, it is offering you a bet that, if the outcome is a perfect coin flip, loses money on average. That hidden fee is called the vig, short for vigorish, and it is also known as the juice. It is how a sportsbook pays its bills, and understanding it is the first step to understanding every number in a baseball betting market.

This article explains the vig with worked examples: what -110 really costs, how to convert any price into a probability, how the vig differs on baseball moneylines and on run lines, why parlays and futures cost far more, and what the arithmetic means for anyone who bets. It contains no picks and no advice on any game. Sports betting carries financial risk, no method guarantees a profit, and the odds are structured so that most bettors lose over time. You must be of legal age where you live, and betting is legal only in some places.

The simplest example: -110 on both sides

Suppose a sportsbook lists the total runs in a game at 8.5, with the over at -110 and the under at -110. The minus sign and the number tell you how much you must risk to win 100 units: at -110 you risk 110 to win 100. If you win, you collect your 110 back plus 100 of profit. If you lose, you lose the 110.

Now imagine a coin-flip proposition where each side truly has a 50 percent chance. If you bet 110 on one side, half the time you win 100 and half the time you lose 110. Your average result per bet is half of 100 minus half of 110, which is a loss of 5. As a share of the amount you risked, that is 5 divided by 110, or 4.5 percent. That 4.5 percent is the vig, and you pay it on every such bet whether you win or lose.

Here is the book's side of the same arithmetic. Suppose it takes 1,100 on the over and 1,100 on the under. It has 2,200 in total. Whichever side wins, it returns that side's stake of 1,100 plus 1,000 in winnings, a payout of 2,100, and keeps the other 100. The book makes 100 on 2,200 handled, which is also 4.5 percent, and it makes it no matter which side wins. That is the idea behind a balanced book, and it is why a sportsbook can be profitable without ever predicting who wins.

Turning a price into a probability

Every betting price implies a probability, and the vig shows up when you add the probabilities for both sides and the total exceeds 100 percent. The formulas for American odds are:

• For a negative price, divide the number (ignoring the minus sign) by that number plus 100. At -110 that is 110 divided by 210, or 52.38 percent.
• For a positive price, divide 100 by the price plus 100. At +110 that is 100 divided by 210, or 47.62 percent.

The article converting baseball betting odds to implied probability goes through more examples. Here is a reference table for common prices.

Add the two sides of a -110/-110 market and you get 52.38 plus 52.38, or 104.76 percent. The extra 4.76 percent is the overround, the amount by which the implied probabilities exceed 100. A fair market with no vig would be priced at +100 on both sides, which sums to exactly 100 percent. Because of the vig, a bettor must win more than half the time just to break even: at -110, the break-even win rate is 52.38 percent.

A simple check shows how thin that margin is. Over 100 bets at -110 (risking 110 to win 100 each time), 52 wins and 48 losses produces 52 times 100 minus 48 times 110, which is a loss of 80. Fifty-three wins and 47 losses produces a profit of 130. The break-even point sits between 52 and 53 wins per 100, so a bettor who wins 52 percent of the time still loses money.

Vig, juice, hold and overround

A handful of words describe related ideas, and they are often used loosely.

• Vig, vigorish and juice all mean the commission built into the price. When a bettor says "I'm paying the juice," they mean they are accepting the lower payout on the winning side.
• Overround is the sum of the implied probabilities minus 100 percent. For a -110/-110 market it is 4.76 percent.
• Hold is the share of the total money wagered that the book keeps if the action is perfectly balanced. For -110/-110 it is 4.55 percent. You can compute it from the overround as one minus one divided by the sum of the probabilities: 1 minus 1 divided by 1.0476 is 0.0455.

The overround and the hold differ slightly because they use different denominators, but both describe the same cushion. A market with a lower hold is a better deal for bettors. A market with a higher hold is a worse deal.

Baseball's own style: dime lines and 20-cent lines

In many sports, the standard price on a point spread is -110 on both sides. Baseball is mostly bet on the moneyline, where you pick the winner outright, and the vig there is built into the gap between the favorite's price and the underdog's. The size of that gap is quoted in "cents."

A dime line has a 10-cent spread between the two sides: for example, -120 on the favorite and +110 on the underdog, or -130 and +120. A 20-cent line has a 20-cent spread: for example, -130 and +110. The "cents" measure how far apart the two prices are once you count each from even money. The wider the spread, the more the bettor pays.

Compare the hold on a dime line, about 2.1 percent, with the hold on a -110/-110 market, about 4.5 percent. That is the reason baseball is often described as a lower-vig sport than football or basketball on its main market: the moneyline between two baseball teams is frequently priced with a smaller margin. The caveat is that the book can quote whatever line it wants, so the comparison is a pattern and not a law, and a bettor should do the arithmetic for every price.

A worked example makes the effect concrete. Suppose a game is priced -150 on the favorite and +130 on the underdog. The implied probabilities are 60.00 percent and 43.48 percent, which sum to 103.48 percent. To remove the vig, divide each by the sum: 60.00 divided by 103.48 is 57.98 percent, and 43.48 divided by 103.48 is 42.02 percent. Those are the "no-vig" probabilities the book's price implies. Converted back to American prices, they correspond to roughly -138 and +138. The book charges 12 cents more than fair on the favorite and 8 cents less than fair on the underdog; the difference is its margin.

The run line and the total

Baseball's run line, covered in the baseball run line explained, is a point-spread bet that is almost always set at 1.5 runs. Because many baseball games are decided by one run, laying 1.5 runs is a much bigger hurdle than picking the winner, so the favorite on the run line usually carries plus-money odds and the underdog getting 1.5 runs is priced at minus money. A typical pair might be +140 on the favorite laying 1.5 runs and -160 on the underdog getting 1.5. Those prices imply 41.67 percent and 61.54 percent, a sum of 103.21 percent and a hold of about 3.1 percent. The exact numbers move with the game, but the structure is always the same: the two sides sum to more than 100.

Totals, or over/under bets, work like point spreads in other sports: the book picks a number, such as 8.5 runs, and prices both sides, often at -110 each, though baseball books frequently adjust the juice instead of the number. If the book wants to attract more money on the under, it may shift from -110/-110 to -115/-105, which raises the cost of the over and lowers the cost of the under without changing the total. MLB over/under totals and what moves them covers the factors that move these lines. A related point: baseball bets on a game usually name the starting pitchers, and if a listed pitcher does not start, the bet may be cancelled, depending on the rules of the book you use.

How the book makes money

A common description says the sportsbook sets a price, takes equal money on both sides, and pockets the vig. That is a useful picture, but it is only part of the truth.

Balanced action. In a balanced market, the book collects the vig from the losing side and pays the winning side from the losing side's money. Its profit is the hold, regardless of the result.

Taking a position. Real books do not always have balanced action. Money tends to come in on popular teams and on overs, and a book may choose to let a one-sided position stand, accepting that it might lose on a given game in exchange for a long-run edge. Large books can absorb that variance across thousands of games. Moving the line is the main way a book manages its exposure: if too much money arrives on one side, it changes the price or the number to attract the other side.

Limits and pricing differences. Books set maximum bet sizes that vary by market and by bettor, and they may reduce the limits of bettors who have won consistently. Different books also price the same game differently, which is why comparing prices matters.

Products with higher margins. The vig on a single side of a game is the smallest margin a book earns. Parlays, same-game parlays, futures and proposition bets carry larger margins, and they are a significant part of the business. The next two sections show how much larger.

Parlays compound the vig

A parlay combines two or more bets, and every leg must win. The payout multiplies the prices of the legs, but the true probability of winning all of them falls faster than the payout rises. Here are exact figures, assuming each leg is -110 and, for the sake of illustration, that each leg is a true 50 percent proposition.

Each added leg multiplies the book's edge instead of keeping it constant. A two-leg parlay of coin flips costs about twice as much, as a share of the money risked, as a straight bet; a four-leg parlay costs nearly four times as much. The numbers shown are what you would get from multiplying -110 prices; individual books price parlays differently, and some use payout tables that are less generous. The lesson is the same either way: the price of a parlay is higher than the price of the bets that make it up.

This is also why a parlay's headline payout looks so large. A +1228 price on a four-leg parlay is the product of four small edges and a small chance of winning, and from the bettor's side the expected value is worse than four separate bets.

Futures and props: the biggest margins

Bets on who will win the World Series, a division or an award are called futures. MLB futures bets explained describes them in detail. They carry the largest vig of the common baseball markets, because the book prices dozens of outcomes and adds a margin to each. You can see it by summing the implied probabilities. Here is an invented four-team division market, for illustration only.

A fair market would sum to 100 percent. This one sums to 112.62 percent, which means the book is holding about 11.2 percent, more than twice the hold on a standard -110 total. In a 30-team World Series market the sum is typically well above 100. Season win totals and how they are set is another market where the prices on both sides of a number carry a margin. Money tied up for months in a futures bet is also money that cannot earn anything else, which is a second cost.

What the arithmetic means for a bettor

Not every cost can be avoided, but some can be reduced.

Know the break-even rate. At -110 you need to win 52.38 percent of bets to break even. At -105 the figure is 51.22 percent. At +110, it is 47.62 percent. A bettor who does not know their break-even rate cannot tell whether they are winning on average.

Compare prices. Different books list the same game at different prices. Suppose a bettor places 1,000 bets, risking 110 to win 100 at one book and 105 to win 100 at another, and wins exactly half of them. At -110 the expected loss is 1,000 times 5, or 5,000, on 110,000 risked. At -105 it is 1,000 times 2.5, or 2,500, on 105,000 risked. The price difference is worth 2,500 over those bets, with no change in the bettor's skill.

Avoid the highest-margin products. The longer a parlay and the longer the time until a future settles, the more it costs on average.

Do not chase losses. A losing bettor who raises the stakes to recover increases the amount at risk against a book that already has an edge on every bet.

None of this makes betting profitable; it only describes what it costs. Because the book's margin is built into every price, bettors as a group lose that margin to the book over time, which is the vig doing its job.

Common misconceptions

"The vig is a fee I can avoid." It is part of the price. There is no way to place a standard bet without it, although the size varies between books and between markets.

"The book wants me to lose each bet." A balanced book does not care who wins a given game. It cares about volume and about the hold.

"A 52 percent win rate is a good record." At -110 it is a slight loss. A good record is measured against the break-even rate for the prices actually paid.

"Underdogs are always better value." The price on an underdog contains vig just as the price on the favorite does. Whether any price is good value depends on whether the true probability is higher than the implied one, and nobody knows the true probability with certainty.

Common questions

What does -110 mean? You risk 110 to win 100, which implies a 52.38 percent probability. It is the standard price on both sides of many spreads and totals.

What is a "pick'em" and does it carry vig? A pick'em is a game priced about even. It still carries vig, because both sides are usually priced at -110 or a similar number.

How do I find the book's margin on a market? Convert each price to a probability, add them, and subtract 100 percent from the total. That is the overround. For the hold, compute one minus one divided by the sum.

Are there ways to lower the vig? Some books offer reduced-juice pricing on certain markets, such as -105 on both sides, and exchange-style markets take a commission instead. Compare the total cost before using either.

Do the same principles apply in October? Yes. Series prices and single-game prices carry vig like any other market. How the MLB postseason works explains the format that those prices are built on.

Responsible gambling

Betting is for adults of legal age, in places where it is legal. It should be treated as a cost of entertainment, with an amount you can afford to lose set in advance, and not as an income or a way to recover losses. If gambling is causing you or someone you know harm, call 1-800-GAMBLER in the United States, or visit the National Council on Problem Gambling at ncpgambling.org, where help is available at any time.

Where to go next

The site's odds page shows current prices, which you can convert with the formulas above, and the baseball betting topic page collects news and explainers. For the arithmetic of reading a price, start with converting baseball odds to implied probability, and for the structure of October, see how the MLB postseason works.