Odds Converter: Decimal, Fractional and American Odds
Type odds in any of the three formats to see them in the other two, and the chance they imply.
On this page
Convert odds 📊
Decimal such as 2.50, fractional such as 3/2, or American with its sign, such as +150 or -200.
Implied probability is 1 divided by the decimal odds. Across all outcomes of one market it usually adds up to more than 100%: the difference is the bookmaker's margin.
How the three formats relate
Decimal odds include the stake: 2.50 returns R2.50 for every R1 staked. Fractional odds show the profit against the stake: 3/2 wins R3 for every R2. American odds show the profit on R100 when they are positive (+150) and the stake needed to win R100 when they are negative (-200).
The implied probability is 1 divided by the decimal odds: 2.50 is 40%. Add the probabilities of every outcome in one market and the total usually comes to more than 100%; the difference is the bookmaker's margin. Our multibet calculator multiplies the odds of several selections.
Common odds in all three formats 📊
| Decimal | Fractional | American | Implied probability |
|---|---|---|---|
| 1.25 | 1/4 | -400 | 80.0% |
| 1.50 | 1/2 | -200 | 66.7% |
| 2.00 | 1/1 | +100 | 50.0% |
| 2.50 | 3/2 | +150 | 40.0% |
| 3.00 | 2/1 | +200 | 33.3% |
| 5.00 | 4/1 | +400 | 20.0% |
Odds FAQ 📊
What does 5/10 mean?
Fractional odds of 5/10 win R5 for every R10 staked: the same price as 1/2, or decimal 1.50.
How do I turn decimal odds into a probability?
Divide 1 by the odds: decimal 4.00 is 25%. The figure includes the bookmaker's margin.
Why do American odds have a plus or a minus?
A plus shows the profit on a R100 stake; a minus shows the stake you need to win R100. +150 and decimal 2.50 are the same price, as are -200 and 1.50.