Vigorish in Betting

What the vig is: the bookmaker's margin built into two-way odds

Vig is the slice the house takes out of the price before you ever see it. On a two-way market, where there are only two possible outcomes, a fair price would reflect each side's true chance of winning. A bookmaker does not quote that fair price. It quotes a slightly worse price on both sides, and the gap between the fair price and the quoted price is the vig. If bettors split their money evenly across the two sides, the book pays the winners with the losers' stakes and keeps the gap as its commission. That is the core of how sportsbooks make money: not by picking winners, but by pricing both sides so the house comes out ahead either way.

The same charge wears different clothes across the region.

Vig, take-out, levy, house edge: the names differ, the mechanism is one.

If you want the fuller picture of how prices are built, see how bookmakers set odds, and for the Asian term for the same margin, read about water in Asian odds.

Vig and juice: two names for the same commission

Vig, vigorish and juice all mean the same thing. "Vigorish" is the full word, borrowed into English betting slang early in the twentieth century; "vig" is its short form, and "juice" is the everyday American name for it. When a bettor says the juice is high, or a book is "juicy," they mean the margin built into the prices is large, and the payouts are correspondingly poor.

Two neighboring terms are worth separating. The overround, or bookmaker's margin, is the same charge expressed as a percentage: add up the implied probabilities of all sides at the quoted prices, and the amount above 100 percent is the margin. Pari-mutuel operators use "take-out" for their version, the share of the pool deducted before dividends are calculated. And in Asian handicap betting the same charge is called the water, as explained on our water price page. Whatever the label, the practical effect on you is identical: the price you are offered is worse than the true chance of the outcome, and the difference is the operator's income.

One related term you will meet in official rules is the dividend. For a fixed odds bet, the dividend is the winning stake multiplied by the fixed odds, subject to any maximum the operator sets; for a pari-mutuel bet, it is the amount declared per winning selection after deductions⁵. The vig sits upstream of that number: it is the reason the fixed odds, or the pool behind the dividend, are smaller than a fair market would pay.

Moneyline odds: how the two-way market is quoted

A two-way market has only two outcomes: one side wins or the other does. Basketball and boxing are the classic cases, since a winner is declared either way. The moneyline is the American way of quoting the price on each side, using a plus or minus number around a baseline of $100. You can read the format in detail on our American odds page; here we only need the two-way case.

Not every "two-sided" bet is truly two-way. Japan's WINNER sports lottery asks you to predict the 90-minute score of a J.LEAGUE match from 18 options, or, for B.LEAGUE basketball, the winning team and point difference from 16 options, so those are many-way markets with a different pricing logic⁶. Football's handicap markets, by contrast, use a notation that mirrors the moneyline's signs: a minus marks the team giving the handicap and a plus marks the team receiving it, with the number of goals after the sign, so -1 means giving one goal⁷. The minus-and-plus habit runs through betting generally: minus for the side expected to win, plus for the side expected to lose.

In pari-mutuel sports such as Korean boat racing, the quoted dividend rate is an indicator of the likelihood that a specific player or combination wins or places, and of the expected payout, calculated from past records, track characteristics and betting status⁸. A fixed-odds moneyline compresses all of that into one number per side.

The minus sign: the favorite and what you stake to win $100

A minus price marks the favorite, and the number tells you how much you must stake to win $100. The standard two-way line is -110 on both sides: at -110 you stake $110 to win $100, plus your $110 stake back if you win. At -150 the favorite is heavier, and you must stake $150 for the same $100 profit. At -300 you stake $300. The bigger the minus number, the shorter the price and the more the market expects that side to win.

The logic is the same in any odds system: the lower the odds, the more popular the pick. Keirin's official beginner guide puts it plainly: the lower the odds, the more favored the selection; the higher the odds, the less popular it is⁹. Keirin newspapers even print a symbol system on race cards, with a mark for the favorite, the rider most likely to win, and a circle for the rival who may beat him¹⁰. A minus moneyline number is the same message in American dress.

Plus sign meaning: the underdog and what $100 returns

A plus price marks the underdog, and the number tells you what a $100 stake returns in profit if that side wins. At +150, a winning $100 bet pays $150 profit, plus your $100 stake back. At +300, the same $100 pays $300. The bigger the plus number, the bigger the underdog and the larger the payout, because the market thinks that side is less likely to win.

The trade-off is always the same, and it is worth saying plainly: bigger payouts mean lower odds of winning. Three Card Poker's Pair Plus bet is a casino example of the same principle; it pays 40 to 1 when it wins, but it is more likely to lose than win, which is why chasing losses with it is not a winning approach¹¹. A +400 underdog pays well for exactly the reason it usually loses. The plus sign is not a bargain marker; it is a probability statement.

Even money: why the plus sign is not always shown

Even odds, or even money, means a stake of $100 wins $100: a 50-50 shot paid at double your money back. On the moneyline, even odds are written +100 or -100, and the two are the same price. Many boards drop the sign entirely and show simply 100, so a price with no plus or minus is usually even money. If you see a two-way market quoted 100 on one side and 100 on the other, you are looking at a fair coin-flip price with no vig, which bookmakers rarely offer; more often you will see -110 on both sides, which is the same 50-50 market with the vig included.

Casino tables quote even money in their own way. In craps, the pass bet and come bet pay 1 to 1, which is even money by another name¹². The even-money bets in any game are the ones where the payout matches the stake, and they are also where the house's edge hides in the fine print rather than in the headline number. Casino War's tie bet is the cautionary example: higher payouts mean lower odds of winning, so placing tie bets to win back losses is not a winning strategy¹³.

How the vig shifts the payout away from true even odds

Take a genuine 50-50 contest and price it fairly. Each side should return even money. Now add the vig: quote -110 on both sides. Anyone who stakes $110 to win $100 is accepting a price below the true chance. If the money splits evenly between the sides, the book collects $220 in stakes and pays out $210 to the winners, keeping $10. That $10, a little under 5 percent of the handle, is the vig doing its work. Neither bettor did anything wrong; the price itself carried the charge.

Fixed odds rules spell out what you actually receive: when your selection wins, your stake is multiplied by the fixed odds recorded for your bet¹⁴. The vig was applied before that multiplication, in the odds themselves. In pari-mutuel betting the same subtraction happens in the open: the track deducts its take-out from the pool, and only what remains is divided among winning tickets². In bingo, the operator simply keeps a portion of the cost of play³. And in Macau's Super Pan 9 the levy is taken from the winner at payout, 5 percent of the amount won¹. Four settings, one arithmetic: money in, a share removed, the rest paid back.

Payouts can also vary with the situation rather than the margin. In craps, the odds bet pays differently depending on what the point is, so the same table quotes several even-looking prices at once¹⁵. For a deeper look at stripping the margin back out of a quoted price, see our page on fair odds without margin, and for what the margin means to you over many bets, read about expected value.

Where the vig shows up in practice: basketball, boxing and other two-way markets

Two-way markets are everywhere once you know to look. Basketball is the textbook case: one team wins or the other does, so the moneyline is a natural quote. Korea's Basketball Toto Special Plus runs on a unit bet of KRW 100, and every price on its board carries the operator's margin¹⁶. Japan's WINNER lottery prices B.LEAGUE matches with a first prize for correctly predicting the result, the prize being the odds multiplied by the purchase amount⁶.

Football offers two-way markets inside a three-way game. Odd/Even bets on the total number of goals have only two outcomes, and the rules handle the edge case simply: in the case of a void match, all Odd/Even football bets are refunded¹⁷. Handicap markets turn football into a two-way contest by adjusting the score, with the minus team giving goals and the plus team receiving them⁷. Live sports betting at venues such as Singapore Pools' Livewire puts the same two-way prices in front of you while the match is running¹⁸.

Pari-mutuel sports carry the same charge under the take-out name. Japan's WINNER payout odds fluctuate with voting status until sales close, and the theoretical payout is the unit price times the number of choices times 50 percent, a formula that shows the deduction before any prize is set²⁰. Wherever exactly two outcomes are on the board, the price on each side is a fair price minus a commission, and reading the two prices together tells you how large that commission is.

Odds on the move: why quoted payouts change while betting is open

The price you see when you open the app is not guaranteed to be the price when you place the bet. Fixed odds rules state it directly: the operator may change the fixed odds for a particular bet type at any time before bet placement²¹. The same applies to horse racing's fixed odds, where the operator may change the odds of a bet type at any time¹⁹.

What is locked is your own bet. Once a bet is valid, neither the operator nor the bettor may change the fixed odds recorded for it, no matter how the market moves afterward¹⁹. So the sequence matters: odds can move up to the moment of acceptance, and never after.

Pari-mutuel odds move for a different reason: they are not set at all, but computed from the pool. At Kasamatsu Keiba, the payout rises and falls depending on how many people buy each horse and how much they stake, so the odds change from moment to moment²², and the same guide repeats that the displayed odds are an approximate multiplier of the payout if your ticket wins²³. In live football betting, the handicap line and the odds change as the match develops, and the payout is based on the full-time result adjusted by the handicap line at the time of betting, not the score at the moment you bet²⁴. Cash out adds another moving price: it lets you take money back on an event before it is over, and offers can get volatile in the final stages²⁵. At Japanese racecourses you can watch all of this on the monitors inside the racecourse, and odds change constantly until the cut-off time for placing bets, two minutes before post time²⁶. Japan's WINNER lottery publishes the same notice: payout odds change with voting status until sales close, and are updated on the official site²⁷. For the full mechanics of line movement, see why odds change.

A quick checklist for reading a two-way price

Before you place a bet on any two-way market, run through these steps:

1. Find the two prices. Confirm the market really has only two outcomes, and note both numbers. If both sides show -110, you are looking at the standard vig line.
2. Read the signs. Minus means favorite and shows the stake needed to win $100; plus means underdog and shows what $100 returns. No sign usually means even money.
3. Compare the two sides. The further the pair sits from a fair 50-50 price, the bigger the commission. Our page on fair odds shows how to strip the margin out and check.
4. Check the minimum stake. Minimums vary widely by operator: JPY 100 per bet on Japan's toto²⁸, a unit of X￥100 marked on a Tokyo City Keiba win bet slip²⁹, P 5.00 for a win or forecast bet in Philippine racing³⁰, and VND 10,000 on Vietlott Keno, which is also the default if you leave the amount blank³¹.
5. Know what happens on a void. On football's two-way Odd/Even market, a void match means all bets are refunded¹⁷, so check the rules for the market you are on.
6. Watch for movement. Odds can change until your bet is accepted, and live prices move with the match; once accepted, your recorded odds are fixed¹⁹.
7. Remember the payout formula. Your return is your stake multiplied by the odds recorded for your bet¹⁴, nothing more and nothing less.

Two examples show how probability sits behind every price. A quinella ticket in a six-boat race has a 1 in 15 chance if all outcomes were equally likely³², and a wide bet in a nine-rider keirin field has a 3 in 36 chance³³. Bookmakers do the same sums, then shave the price before showing it to you. That shave is the vig, and knowing it is there is the first step to reading any two-way price honestly.