You go 5–5 on your bets and expect to be back where you started. Then you check the balance. Somehow, you are down.
That missing money has a name: the vig. It is the sportsbook’s margin baked into the odds, and it is why picking winners half the time can still leave you losing money.
You do not need a spreadsheet to understand it. Start with one price you have probably seen a hundred times: -110.
Sources checked October 16, 2026, at 8:04 a.m. EDT. All prices, stakes and results below are hypothetical examples, not current offers or picks.
The vig is hiding in the payout
Imagine a fair coin toss. Heads and tails each have a 50% chance. A fair even-money bet would let you risk $100 to win $100 in profit.
Now imagine both sides are offered at -110. You have to risk $110 to win $100. Win, and you get $210 back: your $110 stake plus $100 profit. Lose, and the full $110 is gone.
That smaller reward for the risk is how the price makes room for the sportsbook. BetMGM calls the vig a built-in price; bettors also call it “juice.” It is generally inside the odds, rather than a separate charge added at checkout.
Why a 5–5 record can lose money
Let’s keep every bet the same size: $110 at -110. No pushes, voids or bonus bets. Just ten ordinary cash bets.
| Results | Net effect |
|---|---|
| Five wins × $100 profit | +$500 |
| Five losses × $110 stake | -$550 |
| Overall: 5–5 | -$50 |
You picked as many winners as losers. You still lost $50. There is nothing mysterious about the balance: each loss cost more than each win earned.
This is also why “I win more than half my bets” does not tell the whole story. The odds and stakes decide what that record is worth. Our betting-log guide explains how to keep the record and the money together.
How often do you actually need to win?
For equal-sized -110 bets, the break-even point is about 52.38% of bets that finish as wins or losses. Here is the short version of the math:
$110 risk ÷ ($110 risk + $100 profit) = 52.38%.
That is the hurdle set by the payout. It is not a prediction of your next bet, and reaching it over a short run does not guarantee future results.
Change the price and the hurdle changes, too:
| Odds | Risk to win $100 | Break-even win rate |
|---|---|---|
| -105 | $105 | 51.22% |
| -110 | $110 | 52.38% |
| -120 | $120 | 54.55% |
| -130 | $130 | 56.52% |
A favorite can win more often and still be a worse purchase. Paying -130 instead of -110 means you need more wins to cover the losses.
One price does not tell you the whole margin
Here is a useful distinction: -110 tells you your payout and break-even rate. To examine the margin across a market, you need the prices for every possible outcome. Smarkets explains why the whole market matters.
In our two-sided -110/-110 example, each price implies 52.38%. Add them and you get 104.76%. The extra 4.76 percentage points above 100% are called the overround.
That does not mean the sportsbook takes exactly 4.76% of every stake. In the perfectly balanced example where two people each risk $110 on opposite sides, the book collects $220 and pays the winner $210. It keeps $10, or about 4.55% of the money taken. Real results also depend on where the money lands and which side wins.
You may also see “no-vig probability.” One simple method divides each implied probability by their total. Our symmetric example becomes 50% on each side. That removes the overround mathematically; it does not prove a real game is a coin flip or reveal a player’s true chance.
The practical move: care about the price
Suppose the exact same bet is -105 in one place and -115 in another. At a fixed $100 stake, a win earns about $95.24 at -105 versus $86.96 at -115. Same result, roughly $8.28 more profit at the better price.
“Exact same” matters. Over 6.5 goals is not over 7. A regulation-only hockey bet is not a full-game moneyline. Different participation or settlement terms can change what you are buying. Compare like with like.
A better price improves the payout. It does not rescue a bad pick or create an edge by itself. There is also no need to place extra bets just because you found less juice.
Think of the vig as the head start you give the sportsbook. You cannot judge a bet by how likely it looks to win while ignoring what it pays.
Once a bet is placed elsewhere, BetSlip Live can help you import a supported slip, review the legs and follow supported live progress. Coverage varies by event and market. The app tracks bets; it does not accept wagers.