Formula / logic
Raw implied probability for each outcome is 1/odds. Overround = Σ raw probabilities − 1. Normalized probabilityᵢ = raw probabilityᵢ / Σ raw probabilities.
Sports utilities
Bookmaker Margin / Vig Calculator
Calculate the market overround from 2–12 decimal prices and normalize each raw implied probability to 100%.
Calculator
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Calculation result
Result
Enter the values and calculate to see the result.
Example
A two-way market at 1.91 and 1.91 has total implied probability of about 104.71%, corresponding to an overround of about 4.71%.