Vig Calculator

The vig, or vigorish, is the sportsbook built-in margin; it is the amount by which both sides implied probabilities add up above 100 percent on a two-way market.

It sums both sides implied probabilities, which exceeds 100 percent, then divides each side by that total so the two fair probabilities add to exactly 100 percent.

The vig is the built-in cost of betting, so a lower vig market keeps more of your expected return; the tool reports the overround so you can compare books.

The vig, short for vigorish and also called the juice, is the built in commission a sportsbook charges by pricing both sides of a market so their implied probabilities add up to more than 100 percent. That excess, known as the overround, is the books theoretical edge.

Yes. Vig Calculator is completely free, with no sign-up and no usage limits.

Yes. Vig Calculator runs in any modern web browser. There is nothing to download or install.

Yes. Vig Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.