Vig / Juice Calculator
Calculate the vigorish (juice) the sportsbook charges on a two-way market.
Vig Calculator
A vig calculator shows how much sportsbook margin is built into a market. That margin is the vig, also called juice or house edge, and it is the reason two seemingly normal prices can still be worse than they look.
A lot of bettors focus only on the side they want to bet. Sharp bettors also look at what the book is charging to hold that opinion. A sports betting vig calculator helps expose that hidden cost by measuring the margin in the line and showing how far the posted odds sit from a fair market.
This matters whether you are comparing books, checking market quality, or trying to find value. If one market is carrying noticeably more vig than another, you are starting from a worse position before the game even begins. A juice calculator helps make that visible. Once you can see the tax, you get a much clearer read on the actual price.
Frequently Asked Questions
What is vig in sports betting?
Vig, short for vigorish, is the sportsbook's built-in margin on a betting market. You will also hear it called juice, house edge, or just the book's cut.
This is how sportsbooks make money. The line is not just a reflection of probability. It is probability with a fee built into it.
That is why a market can look fair on the surface and still be slightly worse than it appears. The sportsbook is taking its share through the pricing.
How is vig calculated?
To calculate vig, convert both sides of the market into implied probability, add them together, and subtract 100%.
Using an example:
Warriors -150 implies 60% Lakers +100 implies 50%
Add them together:
60% + 50% = 110%
Now subtract 100%:
110% - 100% = 10% vig
That extra 10% is the sportsbook's margin built into the market.
This is exactly why a vig calculator is useful. It shows how much of the line is actual implied probability and how much is just tax.