Side 1
- Book odds
- −110
- Fair American
- +100
- Fair decimal
- 2.000
- True chance to win
- 50.00%
Vig calculator
Every sportsbook price has a hidden fee baked in, usually called vig or juice. Enter your odds below and we'll show you the true, fair price underneath, plus flag it if you've stumbled on a bet you literally can't lose.
Enter the odds from your sportsbook
Type in the price for every side of the bet, exactly as your book shows it. If you're checking for an arbitrage, use the best price you can find for each side, even if they're from different books.
Example: -110 or +150
Example: -110 or +150
The book's cut (vig)
4.76%
Total implied probability: 104.76%
Side 1: 52.4%Side 2: 52.4%
These prices add up to 104.8%, but a real market always adds up to 100%. That extra 4.8 points is the book's vig.
What the odds would look like with no vig
This strips out the book's cut and shows the true, break-even price for each side. It's a good baseline for spotting whether your book's price is actually good.
Side 2
- Book odds
- −110
- Fair American
- +100
- Fair decimal
- 2.000
- True chance to win
- 50.00%
We remove the vig by scaling each side's implied chance down proportionally until they add up to 100%. Keep in mind these are the market's best guess, not a guarantee of what will happen.
Want to skip the manual comparison? WagerLens puts prices from multiple books in one place.
Start Your Free TrialWhat vig actually tells you
Vig (short for "vigorish," also called juice) is the cut a sportsbook builds into its odds. It's how the book makes money regardless of who wins. You're never told this number directly, but you can back it out of the price.
Here's the simplest example. A true coin flip should pay even money, +100 on both sides. Instead, a book will usually post −110 on both sides. Do the math on those two prices and they add up to 104.76%, not 100%. That extra 4.76% is the vig. Bettors also call this number the overround.
That percentage isn't a guarantee of profit for the book. How much a sportsbook actually keeps depends on which side people bet and how the game plays out. Vig is just the markup baked into the price you're offered.
How we calculate it, step by step
We turn each price into a percentage (its implied probability), then add up those percentages. Anything past 100% is the vig. To find the fair, no-vig price, we shrink every outcome down proportionally until the whole market lands back at exactly 100%.
Side 1: −110 → 52.38% implied
Side 2: −110 → 52.38% implied
Add them up: 52.38% + 52.38% = 104.76%
Vig: 104.76% − 100% = 4.76%
Fair (no-vig) chance: 52.38% ÷ 104.76% = 50.00%
What the no-vig price doesn't tell you
Stripping out the vig gives you a cleaner read on the market, not a crystal ball. It doesn't reveal the real, objective odds of the outcome happening. The sportsbook can still be wrong, and lopsided markets can give slightly different answers depending on the math used to remove the vig.
If you're hunting for value, start with a sharp book (or an average across several books), strip the vig, then compare that number to the price you can actually get. A random line from your app isn't automatically the "true" price just because you removed the vig from it.
When the calculator flags an arbitrage
A single sportsbook will almost always price a market above 100%, that's the vig doing its job. But if you shop around and grab the best price on each side across a few different books, those prices can sometimes add up to less than 100%. When that happens, you can bet every outcome and profit no matter what happens. That's an arbitrage, and it's rare enough that you should double check it before you bet.
Before you fire off bets, make sure the prices are still live, both bets cover the exact same market, and both books settle it the same way. A stale line, different overtime rules, a mismatched prop, a bet limit, or a voided bet can turn a clean arbitrage into a losing trade.
How much vig should you expect?
These are rough starting points, not hard rules. The same type of bet can carry very different vig from one book to the next, so always check the actual price in front of you.
| Market | Common pricing | Typical vig |
|---|---|---|
| Spreads / totals | −110 / −110 | 4.5–5% |
| Moneylines | Varies | 3–6% |
| Player props | Often −115 / −115 | 5–12% |
| Futures | Many outcomes | 10–30%+ |
The easiest way to pay less vig
Shop the price. Moving from −110 to −105 looks like nothing, but it cuts the vig on a balanced two-way market from 4.76% down to 2.44%. Do that across a season's worth of bets and the savings add up fast. Reduced-juice books help too, but checking the price before you bet is the one habit fully in your control.
Frequently asked questions
What is vig, in plain English?
Vig (short for vigorish) is the fee baked into a sportsbook's odds. You never see it as a line item, it's just built into the price. It's how the book makes money no matter which side wins. You can measure it by adding up the implied probability of every side of a bet: anything over 100% is the vig.
What's the standard vig on a sports bet?
A common spread or total is priced at -110 on both sides. Those two prices add up to 104.76%, so the vig is 4.76%. Moneylines, props, and futures carry different amounts depending on the book and the market.
Are vig, hold, margin, and overround the same thing?
Bettors use these words pretty loosely, but they're not perfectly interchangeable. This calculator shows overround, the percentage points above 100% baked into a full market's prices. A sportsbook's actual hold (what it keeps in real dollars) depends on which bets it takes and how the game plays out.
How does this calculator remove the vig?
It uses proportional (also called multiplicative) normalization. Each side's implied probability gets divided by the market's total, so the adjusted numbers add up to exactly 100%. Other methods exist and can give slightly different answers on heavily lopsided or many-outcome markets.
What does it mean if the number comes out negative?
If the best live price for every outcome adds up to less than 100%, you may have found an arbitrage: a bet you can make on every side and profit regardless of the result. The calculator shows the theoretical return and how to split your stake. Just confirm every price is live and covers the exact same bet before you act.
Are the no-vig odds the real, true probabilities?
No. They're the market's best guess after stripping out one particular version of the vig. They're most useful as a reference point, especially when the source is a sharp book or an average across several books, not as a guaranteed outcome.
Related tools
Price shopping is one of the few edges fully under your control. Read what bad prices do to your bankroll, or compare player props across books.