No-Vig Tool
Strip the bookmaker margin to reveal fair odds and true no-vig probabilities.
How to Use This Calculator
- Pick your odds format: Decimal, Fractional, or American
- Enter the bookmaker’s odds for each outcome in the event
- Add or remove outcomes as needed
- Read the fair odds (vig stripped out), the fair probabilities, and the bookmaker’s overround
The overround shows the extra probability the bookmaker has baked in as 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 is the vig or juice?
The vig (vigorish) or juice is the bookmaker’s built-in margin. It guarantees the bookmaker a profit whatever the result. It equals the gap between total implied probabilities and 100%.
What are fair odds?
Fair odds are the odds you’d see with zero bookmaker margin. They reflect the true market-implied probabilities of each outcome.
How much vig is normal?
Sharp bookmakers usually run a 2-3% overround; recreational ones often sit at 5-7% or higher. Less vig means better odds for the bettor.