What Is the Vig? The Price of Every Bet, Explained
The vig is the fee built into every sportsbook price. How to calculate hold from any two prices, why parlays and futures cost more, and what you really pay.
By Lines & Limits Editorial8 min read
The vig — short for vigorish, also called juice or margin — is the fee a sportsbook charges for taking your bet. It is not a line item. It is built into the two prices, which is why a coin flip is priced at −110 on both sides instead of +100 on both sides.
You pay it on every bet, win or lose, and you pay it at the moment the bet is accepted. The whole skill of reading a market is working out how large that fee is and whether the thing you are buying is worth it.
How the vig is hidden in the prices
Take the simplest possible market: a point spread priced −110 on both sides. Convert each price to implied probability:
- Side A:
110 ÷ 210 = 52.3810% - Side B:
110 ÷ 210 = 52.3810% - Sum:
104.7619%
Two outcomes that cannot both occur have a combined implied probability of 104.76%. That is arithmetically impossible as a probability, which is the point — the excess is the fee.
Overround vs hold: two numbers, one market
These get used interchangeably and they are not the same number. Being precise about it is the difference between understanding a market and repeating a stat.
Overround is the amount by which the implied probabilities exceed 100%. On a −110 / −110 market:
104.7619% − 100% = 4.7619% overround
Hold is the share of total money staked that the book keeps if the action is perfectly balanced:
4.7619 ÷ 104.7619 = 4.5455% hold
The dollar version makes it concrete. Suppose $100 comes in on each side of a −110 / −110 spread:
- The book takes in
$100 + $100 = $200. - One side wins and is paid
$100 × 1.9091 = $190.91. - The book keeps
$200 − $190.91 = $9.09. $9.09 ÷ $200 = 4.55%
So 4.76% is the overround and 4.55% is the hold. Overround is measured against probability; hold is measured against handle. When a market is described as “4.5% hold,” that is the second number.
How vig scales with the price ladder
The jump from −105 to −120 looks small on screen and is not small at all.
| Two-way market | Sum of implied probabilities | Overround | Theoretical hold | Break-even win rate |
|---|---|---|---|---|
| −102 / −102 | 100.99% | 0.99% | 0.98% | 50.50% |
| −105 / −105 | 102.44% | 2.44% | 2.38% | 51.22% |
| −108 / −108 | 103.85% | 3.85% | 3.70% | 51.92% |
| −110 / −110 | 104.76% | 4.76% | 4.55% | 52.38% |
| −115 / −115 | 106.98% | 6.98% | 6.52% | 53.49% |
| −120 / −120 | 109.09% | 9.09% | 8.33% | 54.55% |
Moving from −110 to −120 nearly doubles the hold. Moving from −110 to −105 nearly halves it. Ten cents of juice on a screen is a 2-percentage-point swing in the win rate you need, and almost nobody’s handicapping is accurate to 2 percentage points.
The same math applies to lopsided markets. A moneyline of −150 / +130 sums to 60.0000% + 43.4783% = 103.4783%, an overround of 3.48% and a hold of 3.36%. Prices do not have to be symmetric for the method to work — you always convert every side and add.
Why parlays multiply the vig
A parlay does not add fees. It compounds them, because every leg carries its own margin and the legs multiply.
Take three independent −110 legs, each with a true probability of 50%.
- True probability of all three:
0.5 × 0.5 × 0.5 = 12.5% - Fair decimal payout:
1 ÷ 0.125 = 8.00(that is +700)
If the book simply multiplies the leg prices through: 1.9091 × 1.9091 × 1.9091 = 6.9579 decimal, which is about +596.
Your expected return is 0.125 × 6.9579 = 0.8697 per unit staked — a 13.03% hold, nearly three times the 4.55% you pay on a single leg.
If the parlay pays a flat 6-to-1 instead (decimal 6.00, the traditional card payout), your expected return is 0.125 × 6.00 = 0.75, a 25% hold.
That is the entire mechanism, and it gets worse with every leg added. The compounding effect is worked through in detail in why parlays pay less than fair odds.
| Legs at −110 | Fair decimal | Priced-through decimal | Theoretical hold |
|---|---|---|---|
| 1 | 2.00 | 1.9091 | 4.55% |
| 2 | 4.00 | 3.6446 | 8.88% |
| 3 | 8.00 | 6.9579 | 13.03% |
| 4 | 16.00 | 13.2833 | 16.98% |
| 5 | 32.00 | 25.3591 | 20.75% |
Why props and futures cost more than mainlines
Hold is not uniform across a sportsbook. It is typically lowest on major-league sides and totals, higher on player props and alternate lines, and highest on futures. That is structural, and the reasons are mechanical rather than sinister:
- Competition. Mainlines are the most-shopped prices in the industry. A book that is 8% wide on an NFL spread loses the business to a book that is 4% wide. Nobody line-shops a third-quarter rebounds prop with the same discipline.
- Information. A book has enormous data on which to price a full-game spread and much less on which to price an obscure prop. Wider prices are insurance against being wrong.
- Limits. Low-confidence markets carry low maximum bets, and if you can only take small amounts, you need a bigger margin per unit to make the market worth offering. This is the same logic that drives how sportsbooks set limits.
- Correlation risk. Same-game combinations require the book to price relationships between outcomes, which is harder than pricing outcomes. Margin covers the modeling risk.
The honest framing is “typically” rather than “always.” Margins vary enormously by operator, sport and market, and the only reliable way to know what you are being charged is to convert the prices in front of you.
Futures: the extreme case
A futures market is not two-way, it is n-way, and the method does not change: convert every price on the board to implied probability and add them all up.
Here is an illustrative eight-team board — invented for the arithmetic, not a real market — to show what that looks like:
| Team | Price | Implied probability | No-vig probability |
|---|---|---|---|
| A | +180 | 35.71% | 29.97% |
| B | +320 | 23.81% | 19.98% |
| C | +450 | 18.18% | 15.26% |
| D | +600 | 14.29% | 11.99% |
| E | +850 | 10.53% | 8.83% |
| F | +1100 | 8.33% | 6.99% |
| G | +2000 | 4.76% | 4.00% |
| H | +2700 | 3.57% | 3.00% |
| Total | 119.18% | 100.00% |
That board carries a 19.18% overround and a 19.18 ÷ 119.18 = 16.10% theoretical hold. Real futures boards frequently run in this territory or wider, especially where the field is large and the longshots are priced far short of fair.
Two things follow. First, a 40-team outright board can be summed the same way, and doing it takes about four minutes with a calculator. Second, “I got a great price on a futures bet in July” is a claim that should be checked against the whole board, not against your memory of what the price was last season.
What “reduced juice” actually means
Reduced juice is a market priced tighter than the −110 standard — typically −105 on both sides, occasionally tighter on selected markets.
Arithmetically:
- −110 / −110: hold 4.55%, break-even 52.38%
- −105 / −105: hold 2.38%, break-even 51.22%
Over 100 bets of $100 on genuine coin flips, the −110 version costs you an expected $454.55 and the −105 version costs $238.10. Same bets, same outcomes, $216.45 difference — purely from the fee.
That gap is larger than the edge most winning bettors have. Which is the practical point: the price you pay for access to a market is a bigger lever for most people than the quality of their opinions about games.
The same bet costs different amounts in different places
A spread of −3 is the same bet everywhere. A spread of −3 at −105 and a spread of −3 at −115 are not the same transaction: one needs a 51.22% win rate to break even, the other needs 53.49%. Over a season of regular betting, consistently taking the worse of those two is a larger drag than most people’s handicapping is worth.
This is why line shopping is the least glamorous and most reliably valuable habit in betting. It requires no model, no insight and no discipline beyond checking. And it interacts directly with why betting lines move — the number and the juice both move, and a half-point can be worth more than ten cents of price, or less, depending on where the number sits.
None of that turns a negative-expectation activity into a positive one. Paying a 2.4% fee instead of a 4.5% fee is still paying a fee. The claim here is narrow and true: you cannot control results, and you can control what you are charged.
What the vig means for how you should think about a bet
Every price you see is an opinion with a fee attached. Strip the fee out and you have the market’s opinion; compare that to your own and you have the basis for expected value. Skip the stripping step and you are comparing your estimate against a number that has been deliberately shaded against you.
The uncomfortable corollary is that a bettor with no edge and a 4.55% fee does not lose 4.55% of their bankroll — they lose 4.55% of everything they stake, repeatedly, and staking the same bankroll thirty times a month means paying that fee thirty times. Volume is what turns a small fee into a large number, which is the real reason bet frequency matters more than most people think.
Frequently asked questions
What is the vig in sports betting?
The vig, also called juice or margin, is the fee a sportsbook builds into its prices. Instead of charging a commission, the book prices both sides of a market so their implied probabilities add up to more than 100%. That surplus is the fee, and you pay it on every bet whether you win or lose.
How do you calculate the vig on a bet?
Convert both sides to implied probability and add them. The amount above 100% is the overround. To get hold — the share of total money staked the book keeps — divide the overround by the sum. A −110 / −110 market gives 104.76% total, a 4.76% overround, and a 4.55% hold.
Why is it -110 instead of +100?
Because +100 on both sides would be a free service. At −110 each side, a balanced book takes in $200, pays $190.91 to the winning side, and keeps $9.09 — a 4.55% margin. The 10 cents of juice is the entire business model on point spreads and totals.
Is the vig the same at every sportsbook?
No, and that is the most actionable thing about it. The same game can be −105 at one book and −115 at another, which is the difference between needing to win 51.22% and 53.49% of the time. Books also apply very different margins to props and parlays than to mainlines.
Do you pay the vig if you win?
Yes. The vig is not deducted from winnings, it is embedded in the price you accepted. A winning bet at −110 pays less than a winning bet at fair odds would have paid. You paid the fee at the moment you placed the bet, regardless of the result.
What does reduced juice mean?
Reduced juice means a market priced tighter than the −110 standard, such as −105 on both sides. Arithmetically it drops the theoretical hold from 4.55% to 2.38% and lowers your break-even win rate from 52.38% to 51.22%. The bet is identical; the fee is roughly halved.