Bookmakers express the same chance in different formats around the world. Implied probability shows what the odds really say.
How to use the Odds to Probability Calculator
- Decimal odds
- Want to work backwards? Type a value into Implied probability and Decimal odds is calculated for you.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Convert any format to decimal odds, then take the reciprocal for the implied probability.
What each result means
- Implied probability = 1÷[Decimal odds]×100
- Fractional odds (x/1) = [Decimal odds] – 1
Example values
How the main result changes when Decimal odds changes and everything else stays at the example values above:
| Decimal odds | Implied probability (%) |
|---|---|
| 1.75 | 57.143 |
| 2.63 | 38.095 |
| 3.5 | 28.571 |
| 4.38 | 22.857 |
| 5.25 | 19.048 |
| 7 | 14.286 |
Formula
Decimal odds = 1 + fractionalImplied probability = 1 ÷ decimal oddsWorked example
Inputs — Decimal odds: 3.5.
Results — Implied probability = 28.571 %; Fractional odds (x/1) = 2.5; American odds = 250.
Frequently asked questions
Why do implied probabilities add up to more than 100%?
The excess is the bookmaker’s margin.
What does +250 mean?
A 100 stake wins 250, decimal odds 3.5.
What formula does the Odds to Probability Calculator use?
Decimal odds = 1 + fractional.
Can I work backwards from the result?
Yes. Type the result you want into Implied probability and the calculator finds the matching decimal odds.