Calculate No-Vig Odds
Strip the margin for fair, vig-free prices and probabilities.
How to Use This Calculator
- Set your odds format (Decimal, Fractional, or American)
- Enter the bookmaker’s odds for every outcome in the event
- Add or drop outcomes on the fly
- Instantly see the fair odds (vig stripped out), the fair probabilities, and the bookmaker’s overround
The overround reveals how much extra probability the bookmaker has folded in as their margin.
Formula
Step-by-step process:
- Convert all odds to implied probabilities
- Sum the probabilities (will exceed 100%)
- Divide each probability by the total to get fair probabilities
- Convert fair probabilities back to odds
Overround (Vig) = Total Implied Probability - 100%
Frequently Asked Questions
What's the vig, or juice?
The vig (vigorish), or juice, is the bookmaker’s built-in margin. It keeps the bookmaker in profit no matter the result, and it’s the gap between the total implied probabilities and 100%.
What are fair odds?
Fair odds are the odds you’d see if the bookmaker ran zero margin. They mirror the market’s true implied probabilities for each outcome.
How much vig is typical?
Sharp bookmakers usually run a 2-3% overround, while recreational ones can sit at 5-7% or higher. Less vig means sharper odds for you.