Implied probability
Results use the values entered and show the formula's arithmetic for this example.
Explore WinsharkThe reciprocal formula
Raw implied probability is calculated as 1 ÷ decimal odds. At 4.00, the result is 0.25 or 25%. This is the probability represented by the price before any attempt to remove margin.
It is not a guarantee of the outcome and should not be treated as a forecast.
Understand market margin
For all possible outcomes in a market, raw implied probabilities may total more than 100%. That excess reflects the way prices can include a margin.
Comparing a single selection's reciprocal with a personal view does not establish expected value unless assumptions and the full market are understood.
Use the tools together
Convert fractional or American prices with the odds converter, then enter the decimal result here. Use the return calculator for stake-based arithmetic.
The decimal-odds guide gives more examples of price and return.
Your next step