Odds converter
Convert a price between the three odds formats the industry uses and see the probability it implies. Type in any format; the others follow.
The formulas
- Decimal odds are the total return per unit staked, including the stake.
- Fractional odds are profit over stake: decimal = 1 + a/b.
- American odds: for decimal odds of 2.00 or more, +100 × (decimal − 1); below 2.00, −100 / (decimal − 1).
- Implied probability = 1 / decimal odds. It includes the bookmaker's margin, so the implied probabilities of all outcomes add up to more than 100%.
Worked examples
| Decimal | Fractional | American | Implied probability |
|---|---|---|---|
| 2.50 | 3/2 | +150 | 40.0% |
| 4.00 | 3/1 | +300 | 25.0% |
| 1.50 | 1/2 | -200 | 66.7% |
To see how much margin a whole market carries, use the bookmaker margin calculator. Terms are explained in the glossary.
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