// Tools · No-vig

No-Vig Calculator

Enter both sides of a market. Out comes the book's cut, the fair price, and what the market really thinks.

Fair odds A
Fair odds B
True chance A
True chance B
Book's margin
Implied total

Why the posted price isn't the real one

Add up the implied probabilities on both sides of any market and you'll get more than 100% — usually 102-105% on a moneyline, far more on props and futures. That surplus is the book's margin: the amount you pay for the privilege of betting.

Dividing each side by the total rescales the market to 100% and reveals the no-vig line — the closest thing to the market's honest opinion. It's the baseline any serious handicapper compares their own number against: beat the fair price, not the posted one.

We publish this number automatically for every game on the board, every day.

Inside the Number · every game priced at what the market really thinks · free pick daily · 21+ only. If gambling stops being fun, call 1-800-GAMBLER.