Calculadora de Probabilidade Implícita (odds → P)
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
Formula
P = 1 / odd
About this calculator
The Implied Probability Calculator converts decimal odds into percentage probabilities. The formula is simple: P = 1 / odd. For example, odds of 2.50 imply a 40% probability (1 / 2.50 = 0.40). This tool is useful for bettors and analysts who want to compare odds with their own chance estimates.
It works instantly: enter the decimal odds and get the corresponding probability. The calculation assumes the odds reflect all available information, without house margin. Use it to evaluate if a bet has positive expected value by comparing implied probability with your personal belief.
Use cases include: analyzing sports betting odds, prediction markets, or any context where odds are presented. Caution: odds may include house margin, distorting the true probability. The calculator does not adjust for this; it provides only the raw implied probability.
For betting, combine this tool with expected value and margin calculators. Remember: low implied probability (high odds) may indicate an unlikely event, but it can also reflect market inefficiency.
Frequently asked questions
What is implied probability?
It is the probability calculated directly from the odds, assuming they reflect the true chance of the event.
How to calculate implied probability from decimal odds?
Divide 1 by the decimal odds. Example: odds 2.50 give 1 / 2.50 = 0.40 or 40%.
Does implied probability consider the house margin?
No. The calculator uses raw odds. The house margin makes the sum of implied probabilities of all outcomes exceed 100%.
Can I use this calculator for fractional or American odds?
Not directly. Convert them to decimal first using another tool, then use this calculator.
What is the difference between implied and real probability?
Implied is derived from odds; real is the true chance. The difference may represent expected value for the bettor.