WinRate AIFREE SPORTS ANALYTICS TOOL
Odds to implied probability calculator.
Convert decimal odds into implied probability, calculate fair odds from your own estimate and compare the difference — instantly.
Educational calculation only. Implied probability does not remove bookmaker margin, and a positive difference is not a guarantee or a recommendation.
DEFINITIONS
What the numbers mean
Implied probability
The probability represented by decimal odds before adjusting for bookmaker margin. The basic formula is 100 divided by the decimal odds.
Fair odds
The decimal price that corresponds to a probability estimate without an added margin. Divide 100 by the probability percentage.
Probability difference
Your probability estimate minus the market-implied probability. It describes disagreement between two estimates, not a guaranteed advantage.
WORKED EXAMPLE
Example: decimal odds of 1.85
Odds of 1.85 represent an implied probability of approximately 54.05%. If an independent model estimates the same outcome at 60%, its fair odds would be 1.67. The difference is 5.95 percentage points. That gap may be worth investigating, but it does not account for every source of uncertainty.
MARKET CONTEXT
Why bookmaker margin matters
In a complete market, the implied probabilities of all outcomes often add up to more than 100%. The amount above 100% is commonly called overround or margin. For a cleaner comparison, analysts may normalize all outcomes first. This single-odds calculator intentionally shows the direct implied probability so the formula stays transparent.