Published betting odds across major sports leagues include a built-in fee known as the margin, juice, or overround. When the odds for every possible outcome in an event are converted into implied win probabilities and added together, the total exceeds one hundred percent. This excess represents the advantage operators build into their pricing.
To estimate the market's unskewed assessment of each outcome, analysts remove this markup. The standard approach is proportional normalization. In this process, each raw implied probability is calculated from the published price, the percentages are totaled, and each outcome is then divided by that total sum.
This adjustment scales the numbers down so that the final probabilities equal exactly one hundred percent. The resulting figures represent the no-margin or fair probability of each outcome, reflecting the baseline expectation of the market before any pricing friction is added.
Tracking these adjusted numbers provides market observers with a clear picture of underlying pricing across events. Stripping out the margin eliminates the distortion of varying operator fees, establishing a neutral benchmark to assess market movements and probability shifts.