Vig Calculator
Calculate the bookmaker's margin and find the true fair odds for any two-way market.
What is Vig (Juice)?
Vig, short for vigorish (also called juice), is the commission a sportsbook charges on every bet. It is built into the odds so the book profits regardless of the outcome. For example, a standard -110/-110 line has about 4.5% vig, meaning if you add up the implied probabilities of both sides, they total more than 100%. Removing the vig reveals the true fair odds, which you can compare against your own estimated probabilities to find value. Lower vig means you are paying less to place a bet, which improves your long-term expected returns.
Frequently Asked Questions
What's a typical sportsbook vig?
Standard NFL spreads run 4.5% vig (-110/-110). Sharp books like Pinnacle run 2-3% on majors; recreational books charge 6-10% on props and parlays.
How do I find no-vig fair odds?
Remove the vig proportionally from both sides. The calculator handles the math; the principle is that the implied probabilities should sum to exactly 100% in a fair market.
Why does vig matter for +EV betting?
Vig sets the breakeven bar. A 2% edge over the market price is worthless if you're paying 5% vig - your real edge after vig is -3%.
Do all books have the same vig on the same market?
No. Vig varies by book, market, and event. Sharp books often offer reduced vig on high-volume markets. Always shop for the best price.