Vig (or juice or overround) is the bookmaker margin baked into a market. A two-way market where implied probabilities sum to more than 100% carries vig equal to the overround. See the glossary entry for the math.

The no-vig price approximates the book's estimate of "true" probability. Compare your model's probability against the no-vig price, not the offered price, to know whether you have edge.

Is the no-vig price actually fair?

It's the book's implied fair price after stripping margin — not necessarily true probability, but the closest public proxy. Sharp books (Pinnacle, Cloudbet) tend to be closer to true probability than recreational books.

Calculator

Vig Stripper.

Two-way market. Two prices. Strip vig, get the no-vig fair line, see the overround the book is charging.

Inputs

Side A — decimal odds

Side B — decimal odds

Vig

4.71%

Overround above true 100%

Side A — no-vig fair

2.00

Implied 50.0%

Side B — no-vig fair

2.00

Implied 50.0%

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Frequently asked questions

What is vig?

Vig (or juice or overround) is the bookmaker margin baked into a market. A two-way market where implied probabilities sum to more than 100% carries vig equal to the overround. See the glossary entry for the math.
Why strip vig?

The no-vig price approximates the book's estimate of "true" probability. Compare your model's probability against the no-vig price, not the offered price, to know whether you have edge.
Is the no-vig price actually fair?

It's the book's implied fair price after stripping margin — not necessarily true probability, but the closest public proxy. Sharp books (Pinnacle, Cloudbet) tend to be closer to true probability than recreational books.