See the juice. Price the fair market.
Enter both sides of any two-way market. The calculator shows the margin the book is charging and the no-vig fair price of each side.
How devigging works
Vig is baked into both prices. Convert each side of a -110/-110 market to implied probability and you get 52.4% twice — a market that claims 104.8% total probability. Real events sum to 100%. The extra 4.8 points is the book’s margin, collected no matter which side wins.
Vig and hold are different quotes of the same charge. Vig is the overround above 100%. Hold is the book’s cut of perfectly balanced handle — vig divided by the market total. At -110/-110 they are 4.76% and 4.55%. People use the words interchangeably; the calculator shows both so the numbers never surprise you.
Fair odds are the devigged prices. This calculator uses the proportional method: each side’s implied probability divided by the market total. It is the standard baseline, and we name it because it is not the only one — power and Shin methods shift more of the margin onto longshots. On near-even markets the differences are small; on lopsided ones they are not.
Fair prices anchor everything else. A devigged number is the cleanest estimate of what the market actually believes. Feed it into the EV calculator to price your edge, or compare it against the price another book is posting.
How the calculator works
01
Both prices convert to implied probabilities; together they exceed 100%.
02
The excess over 100% is the vig — the margin the book is charging.
03
Divide each side by the market total and the fair no-vig prices fall out.
Vig questions
- What is vig in betting?
- Vig — juice, margin, hold — is the book’s charge built into both sides of a market. At -110/-110 the two implied probabilities sum to 104.8%; a fair market sums to 100%. The excess over 100% is the vig you are paying to play.
- How do you calculate no-vig odds?
- Convert both prices to implied probabilities, then divide each by their sum. At -110/-110 that is 52.4 / 104.8, giving 50% a side — fair odds of even money. This is the proportional method; other devig models weight longshots differently, so we state the method rather than hide it.
- What is the difference between vig and hold?
- Vig is the overround — how far the market total exceeds 100%. Hold is the share of perfectly balanced action the book keeps: vig divided by the market total. At -110/-110 the vig is 4.76% and the hold is 4.55%. Both numbers are on the board because both get quoted.
- Is a lower vig always a better market?
- For the same true probabilities, yes — less margin means the posted price sits closer to fair. Comparing vig across books on the same game is the fastest way to find the sharpest market to price against.
Found a price beating the fair number? Track the pick and we will grade your closing-line value on it.