Understanding the Vig, or Juice

By 4Football Staff · September 24, 2026 · 10 min read

What the vig (or juice) is, why a -110 price is standard on football spreads and totals, how to calculate it, and why it grows in parlays and futures. Educational math only.

Look at almost any football spread and both sides carry the same odd-looking price: -110. If a spread is a fair question with a roughly even answer, why would anyone need to stake 110 to win 100? Why not 100 to win 100?

The extra 10 is the answer to a basic question about any betting business: how does it get paid? The charge goes by several names. It is called the vig, short for vigorish, or the juice, or the commission, or the margin, or the take. Whatever the name, it is a cost built into the price, and understanding it is one of the most useful pieces of numeracy in the whole subject. It explains why even good decisions struggle to win, why combining wagers is costly, and why prices that look almost identical can be different in quality.

This guide explains the idea with plain arithmetic. It is educational. It does not recommend wagering, and every example is hypothetical.

The basic mechanism

Suppose a spread game is priced -110 on each side. Two people each want to make a wager with 110 at stake, one on each side of the game.

• The company collects 110 from each person, a total of 220.
• One side wins. The winner receives a return of 210, which is the stake of 110 plus a profit of 100.
• The company keeps the remaining 10.

No matter which side wins, the company earns 10 from 220 of money wagered. That is the vig at work: about 4.5 percent of the total handle in this simple case. The company did not need to predict the game. It only needed an equal amount of money on both sides.

This is a simplification, and in practice companies do not always balance their books. They may hold positions based on their own pricing, and the details differ by provider and by market. But the example captures the structure of the price. Because the winner is paid less than the loser staked, the bettors as a group lose a little, and the difference is the company's margin.

How to calculate the vig

There are two common ways to describe the size of the margin. They are related but not identical.

The overround

Convert each side's price to an implied probability and add them up. Anything over 100 percent is the overround. For two sides at -110:

• Each side: 110 / 210 = 52.38 percent.
• Total: 104.76 percent.
• Overround: 4.76 percent.

The hold

The hold is the share of the total money wagered that the company keeps if it is balanced. It is the overround divided by the total: 4.76 / 104.76 = 4.55 percent. That matches the 10 out of 220 in the example above.

The two numbers differ slightly, so when you see someone say "the vig is 4.5 percent" and another say "4.8 percent," they may be describing the same price with different measurements. The hold is the one most closely tied to what a company earns.

The break-even rate

For a bettor, the most practical way to feel the vig is through the break-even win rate. At -110, you must win 52.38 percent of the time to break even. Here is the arithmetic for a bettor who places 100 wagers with a stake of 110 each, so 11,000 wagered in total.

• Win 50 of 100: collect 50 × 210 = 10,500 in returns. Net: -500.
• Win 52 of 100: collect 52 × 210 = 10,920. Net: -80.
• Win 53 of 100: collect 53 × 210 = 11,130. Net: +130.

Even a bettor who wins half the time loses about 4.5 percent of the money wagered. To break even, a bettor must beat a coin flip by more than two percentage points, and to profit, by more. The vig is the reason a 50 percent record is a losing record.

Our article on implied probability explains the same break-even idea for every other price.

Why -110 is standard

In American football, the standard price on spreads and totals is -110 on both sides. It is common enough to have a nickname: a "dime line," because the extra 10 on 100 is a dime on a dollar in old gambling slang. The standard is useful for a few reasons.

• It is easy to remember and calculate. A stake of 110 wins 100, so a stake of 11 wins 10.
• It signals an even matchup. Both sides carry the same price, which says the oddsmaker sees the spread as a fair division.
• It is a convention. Customers are used to it, and a departure from it stands out.

Some providers offer reduced prices, such as -105 on each side. With -105 on both, each side implies 51.22 percent, the total is 102.44 percent, and the hold is about 2.4 percent, roughly half the standard figure. Availability and prices vary by provider and by place, and a lower vig is not a recommendation to wager. It is simply a cheaper price for the same question.

The vig in different markets

The size of the margin differs from one type of market to another. Here is a summary.

Moneylines

A moneyline margin depends on the prices. For a hypothetical -200 and +170, the implied probabilities are 66.67 and 37.04 percent, a total of 103.70. The hold is 3.70 / 103.70, or about 3.6 percent. A more lopsided game might have a wider gap, and a nearly even game might have a smaller one.

Parlays

A parlay ties several wagers together, and all must win. The vig compounds. Say you combine two imaginary spread bets, each priced -110. Each leg returns 1.909 times the stake in decimal terms. Together the return is about 1.909 × 1.909 = 3.645 times the stake, a profit of 2.645 per unit staked, which is roughly +264 in American odds.

If each leg truly had a 50 percent chance and the legs were independent, the chance of winning both would be 25 percent, and a fair payout would be 3 to 1, or +300. The offered price of about +264 is lower. The expected result per unit staked is 0.25 × 3.645 - 1 = -0.089, a loss of about 8.9 percent, compared with a loss of 4.5 percent on a single wager. For three legs, the expected loss grows to roughly 13 percent under the same assumptions. The more legs, the bigger the cost. Our article on parlays explains the arithmetic in full.

Futures

In a futures market, several outcomes share one price list, and the overround is often much larger than for a single game. In an imaginary four-team division priced at +100, +250, +400 and +600, the implied probabilities are 50, 28.6, 20 and 14.3 percent. They total almost 113 percent, so the hold is close to 11 percent. A big margin is part of why the long-term cost of futures can be high.

Does the vig mean the books always win?

A company with a margin does not win every wager or every day. Individual results can swing widely, and a company can lose on a big game if the result is unlucky for its positions. Over a large number of wagers, though, the margin tends to show up in the totals. That is why the business is structurally stable even though single outcomes are random. For a deeper look at how companies set prices and manage their exposure, see our article on how sportsbooks make money.

For an individual, the same logic applies in reverse. A person can win in the short run, because short runs are dominated by luck. Over a long run, the margin acts like a constant drag, and anyone who wants to come out ahead must overcome it. Most people who wager do not, which is why describing a wager as entertainment with a cost is more accurate than describing it as an investment.

Practical lessons from the arithmetic

You do not need to place a wager to benefit from understanding the vig. Here are some lessons that apply to reading any price.

1. A price is never just a probability. It includes a charge, so a -110 side is not a 50 percent proposition.
2. Compare prices on the same market. A difference of five points of juice on a single wager can change the break-even rate by more than a point. Our guide to line shopping works through examples.
3. Be skeptical of combinations. A bigger payout is not a bigger value, because the margin grows with every leg.
4. Treat claims of easy profit with caution. Anyone promising steady gains has to explain how they beat a margin of several percent.
5. Remember the unit. The margin applies to every wager. Many small wagers add up to as large a cost as a few big ones.

Comparing three prices on the same question

Suppose three providers list the same spread, with the same number of points, but their prices differ. Assume, for the sake of the illustration, that the bettor's chance of being right is exactly 50 percent. Here is what the price alone does.

The calculation for each row is short. At -115, a 50 percent chance gives an expected return of 0.5 × 100 - 0.5 × 115 = -7.5 on a stake of 115, which is -6.5 percent. At -105, the same method gives -2.5 on a stake of 105, which is -2.4 percent. The spread of the question is identical in all three rows. Only the price differs, and the price alone nearly triples the expected cost between the cheapest row and the most expensive.

This is the reason people who study betting markets care about even a small difference in the juice. A five-point gap sounds trivial and, applied over many wagers, is not.

Frequently asked questions

Is the vig the same as a tax?

No. A tax is a charge imposed by a government. The vig is part of the price set by the company offering the market. Some places do tax betting revenue or winnings, but that is separate and depends on the law where you live.

Does the vig change?

Yes. Prices move for many reasons, and the juice on one side can rise or fall as a company adjusts. You may see a spread move from -110 to -115 on one side and -105 on the other. That change is a way for the company to encourage money on one side. The total margin may stay about the same while the individual prices shift. Reasons include injury news and the amount of money arriving on each side.

Does a better price mean a better wager?

Not by itself. A lower vig improves the arithmetic, but it does nothing about the central uncertainty, which is whether the outcome happens. A cheap price on a bad question is still a bad question. The vig is a cost, and costs matter, but they are only one part of the picture. The other part is the chance of the result, which no price can guarantee.

How do I see the vig on a real board?

Open our odds page, pick a game and convert the two prices on one market into implied probabilities. Add them up. Whatever exceeds 100 percent is the overround. Do the same for the moneyline, the spread and the total of the same game, and you will see that they carry slightly different margins even though they describe the same contest.

Can I avoid the vig?

Not in a normal sportsbook market, since it is part of the business model. Pools among friends do not charge it, and free contests do not either. That is one reason a pick'em contest can be a more relaxed way to enjoy the same games. The structure of a pool, with no company taking a margin, is one of the main differences from a wager.

If you want to follow how prices relate to real games, the schedule lists upcoming matchups and the scores page shows how they ended.

A caution about gambling

Sports betting is legal only in some places, and only for adults of legal age. The arithmetic above shows that wagering carries a built-in expected cost, on top of the normal risk of any single result. If gambling is causing stress or financial difficulty for you or someone you know, the National Problem Gambling Helpline is available at 1-800-GAMBLER.

You can look at current prices on our odds page as a way to practice the calculations in this article. Pick a spread and compute the overround. Pick a moneyline and compute the hold. It takes a minute and teaches more than reading about it.

The short version

• The vig (or juice) is the charge built into betting prices, and it is how the company earns money.
• At -110 on each side, the overround is about 4.76 percent and the hold is about 4.55 percent.
• The break-even rate at -110 is about 52.4 percent, so winning half the time loses money.
• Parlays compound the vig, so more legs mean a larger expected cost.
• Futures often carry the largest margins because many outcomes share one list.
• A lower price on the same question is better arithmetic, but never a reason to wager.