The complete guide
The vig in betting: the complete guide
The vig is the sportsbook’s commission — the reason a coin-flip bet at −110 loses money over time, and the single largest obstacle between a bettor and profit. This guide covers what it is, how to calculate it from any two prices, what it costs, how much it varies by sport (measured, not guessed), and the realistic ways to pay less of it.
What the vig is
Sportsbooks don’t make their money by predicting games correctly. They make it by charging a margin on every bet, built directly into the odds. That margin is the vig — short for vigorish, and also called the juice, the hold, or the overround.
You can see it most clearly in a market where both outcomes are equally likely. A coin flip should pay even money: risk $100 to win $100. A sportsbook prices both sides at −110 instead — risk $110 to win $100. Bet both sides and you stake $220 to collect $210 whatever happens. That $10 gap is the vig, and it is charged on every bet whether you win or lose.
This is why betting is hard in a way that isn’t obvious. You aren’t trying to be right more often than not — you’re trying to be right often enough to clear the commission on top.
Where the word comes from
Vigorish entered English through Yiddish, from the Russian vyigrysh — winnings. It described the cut a bookmaker or moneylender took for handling the transaction, and it long predates legal sportsbooks.
That older sense is still around, which is why you may find the word in contexts that have nothing to do with sports. In loan-sharking, vig means recurring interest on a debt — the source of phrasing like “seven points of vig,” meaning 7% charged per period. In finance more broadly it’s used loosely for any middleman’s cut. In sports betting specifically, it always means the margin baked into the odds, and that’s the sense this guide uses throughout.
How to calculate it
Convert each side of a market to its implied probability and add them together. A market with no margin sums to exactly 100%. A real one sums to more, and the excess is the vig.
−110 → 110 ÷ (110 + 100) = 52.38%
total = 104.76% → overround of 4.76 points
The formula works on any two-way market, however lopsided. A −300 favourite implies 75.0% and its +250 dog implies 28.6%, summing to 103.6% — a slightly cheaper market than the standard spread, which is typical of heavy favourites.
Skip the arithmetic: the free no-vig & hold calculator takes both prices and returns the hold plus the fair, vig-free odds.
Overround vs hold — the two numbers
This trips people up constantly, and it’s worth ninety seconds. The same market gets quoted two different ways:
- Overround — how far the implied probabilities exceed 100%. For −110/−110 that’s 4.76 points.
- Hold — the share of total money staked the book expects to keep. That’s the overround divided by the total: 4.76 ÷ 104.76 = 4.55%.
Both describe the same market; hold is the smaller number because it’s measured against everything wagered rather than against a notional 100%. Industry reporting usually means hold. When you see a figure quoted without a definition, it’s worth checking which one you’re looking at — a “4.8% market” and a “4.5% market” are frequently the same thing.
What it costs you
The most useful way to feel the vig is as a break-even win rate — how often you must win at a given price simply to stay level:
| Price | You must win | |
|---|---|---|
| −120 | 54.5% | a pricier standard on some props |
| −115 | 53.5% | |
| −110 | 52.4% | the standard spread/total price |
| −105 | 51.2% | reduced juice |
| +100 | 50.0% | even money — no vig on this side |
A bettor who genuinely picks 50/50 games at −110 doesn’t break even — they lose about 4.5% of everything they stake, slowly and invisibly. That is the whole business model, and it’s why a high win rate can still lose money.
How much it varies by sport
Most explanations of the vig stop at “about 4.5%.” We measured it. Across 315 games and 3,437 price observations captured from live sportsbook feeds over six weeks, the consensus margin by sport was:
| Sport | Consensus margin | Best available | Shopping removes |
|---|---|---|---|
| Boxing | 5.98% | 4.26% | −29% |
| WNBA | 4.78% | 2.13% | −55% |
| UFC / MMA | 4.75% | 2.02% | −57% |
| MLB | 4.60% | 2.28% | −50% |
| CFL | 4.55% | 2.14% | −53% |
| NCAAF | 4.54% | 2.36% | −48% |
Two findings stand out. Five of the six sports priced within a quarter of a point of each other — the market has converged on a standard price for a two-way bet. And boxing is the outlier: the most expensive market we measured, and the least improvable by shopping. Fewer books quote it, they agree with each other, and they charge more for it.
Full methodology and limitations: what the vig actually costs, by sport.
Where the vig is worst
The 4.5% figure applies to main markets — sides and totals on major sports. Everywhere else it gets worse, sometimes dramatically:
- Parlays. Each leg carries its own margin and they multiply. Three standard −110 legs pay +596 where fair odds would justify +700; by five or six legs the house edge is several times a straight bet’s. This is precisely why books promote them so hard.
- Futures and outrights.Add up the implied probabilities on a championship board and you’ll often clear 130%. More outcomes means more margin.
- Props and derivatives. Lower limits, less attention, wider prices — though the same inattention is why props also disagree most between books, which cuts the other way if you shop.
- Live / in-play betting. Prices are regenerated by algorithm every few seconds with a wider margin to cover the uncertainty.
How to pay less of it
You can’t escape the vig. You can roughly halve it, and none of these require predicting anything:
- Shop every line. The single biggest lever, and our own data measures it: taking the best available price cut the margin ~50% in every sport except boxing. See the line shopping guide.
- Prefer reduced-juice markets. Some books post −105 instead of −110 as standard. That drops your break-even from 52.4% to 51.2% on every bet you place there.
- Stay in low-hold markets. Major-league sides and totals are the cheapest products on the board. Parlays and futures are the most expensive.
- Bet less, better. Vig is charged per bet, so volume on marginal opinions is itself a cost. Fewer, better-priced bets pay less commission by definition.
- Measure whether it’s working. Closing Line Value tells you whether you’re actually buying under market value or just paying retail.
What you can’t do about it
Honesty matters more than optimism here, so: the vig is not a loophole waiting to be found. It is the price of admission, and every realistic strategy is about paying less of it rather than avoiding it.
- Arbitrage doesn’t “beat” the vig at scale. It exploits disagreement between books, the margins are thin, and books limit accounts that do it persistently.
- Reduced juice can be conditional. Some books offer it on selected markets, or to selected customers — check what you actually get rather than the advertised headline.
- Shopping has a ceiling. Our measurement covers regulated North-American books; the more accounts and regions you can access, the lower your effective margin, and access varies enormously by where you live.
- Winning gets you limited.The bettors best at avoiding vig are the ones books most want to restrict. That’s a real ceiling on the whole approach.
Common questions
- What is the vig in betting?
- The vig (short for vigorish, also called juice or the hold) is the sportsbook's built-in commission on a bet. At the standard −110 on both sides of a market you risk $110 to win $100, which works out to roughly a 4.5% margin and means you need to win 52.4% of your bets just to break even.
- How do you calculate the vig?
- Convert both sides to implied probability and add them up. A margin-free market sums to 100%; a real one sums higher, and the excess is the vig. Two sides at −110 imply 52.38% each, so the market sums to 104.76% — an overround of 4.76 points, which is a hold of about 4.55% of everything staked.
- What does vig mean in finance or from a bookie?
- Vigorish originally meant the fee a bookmaker or lender charges for handling a bet or loan — from a Yiddish borrowing of the Russian vyigrysh, meaning winnings. In loan-sharking it describes recurring interest, which is why you'll hear phrasing like "seven points of vig." In sports betting it means the margin built into the odds.
- Which sport has the highest vig?
- In our own measurement across 315 games, boxing was the most expensive at a 5.98% consensus margin — more than a point above every other market we measured. MLB, NCAAF, WNBA, CFL and UFC all clustered tightly between 4.54% and 4.78%.
- Can you avoid the vig?
- You can't eliminate it, but you can roughly halve it. Taking the best available price across sportsbooks cut the margin by about 50% in every sport we measured except boxing. Betting reduced-juice markets and avoiding parlays, props and futures — where the margin compounds or is simply larger — does the rest.
Related: our measured vig-by-sport study · the short version · no-vig calculator · glossary: vig · hold · overround · de-vigging · low hold
Bankroll Guardian is a bet-tracking and analytics tool — not a sportsbook, and none of this is betting advice. Betting carries risk; please bet responsibly.
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