Convert betting odds between decimal, fractional and American formats and see the implied probability.
Decimal Odds 0.00
Fractional Odds 0/0
American Odds 0
Implied Probability 0.00%
Important: This calculator converts betting odds mathematically and estimates implied probability from the odds entered. Implied probability does not predict whether an outcome will occur. 18+ only. Gamble responsibly.
How to Use the Odds Converter
Select the odds format you currently have: Decimal Odds, Fractional Odds or American Odds.
Enter the odds and select Convert Odds. The calculator will show the equivalent decimal, fractional and American odds, together with the implied probability.
For example, decimal odds of 2.50 convert to:
Fractional odds: 3/2
American odds: +150
Implied probability: 40.00%
What Are Decimal Odds?
Decimal odds show the total potential return for every R1 staked, including the original stake.
For example, decimal odds of 2.50 mean that a R100 stake would have a potential return of R250 if the bet wins.
If you want to calculate the potential return from your stake and odds, use our Bet Payout Calculator South Africa.
What Are Fractional Odds?
Fractional odds are commonly written in a format such as 3/2, 2/1 or 5/1.
They express potential profit relative to the stake. For example, fractional odds of 3/2 represent R3 of potential profit for every R2 staked.
Our converter can automatically convert fractional odds into decimal and American odds.
What Are American Odds?
American odds normally appear with either a plus (+) or minus (-) sign.
Positive American odds, such as +150, indicate the potential profit relative to a 100-unit stake.
Negative American odds, such as -200, indicate the stake required to generate 100 units of potential profit.
For example:
+150 = Decimal 2.50
-200 = Decimal 1.50
You do not need to calculate these conversions manually. Enter the American odds into the calculator above and select Convert Odds.
What Is Implied Probability?
Implied probability converts betting odds into a percentage representing the probability implied by those odds.
For decimal odds, the basic calculation is:
Implied Probability = (1 ÷ Decimal Odds) × 100
For example:
Decimal odds: 2.50
1 ÷ 2.50 × 100 = 40%
This means odds of 2.50 correspond mathematically to an implied probability of 40%.
Implied probability is derived from the odds and does not mean there is actually a 40% chance that the outcome will happen. Bookmaker pricing and margins can also affect the odds offered.
Odds Conversion Examples
| Decimal | Fractional | American | Implied Probability |
|---|---|---|---|
| 1.50 | 1/2 | -200 | 66.67% |
| 2.00 | 1/1 | +100 | 50.00% |
| 2.50 | 3/2 | +150 | 40.00% |
| 3.00 | 2/1 | +200 | 33.33% |
| 5.00 | 4/1 | +400 | 20.00% |
Frequently Asked Questions
Can I convert decimal odds to fractional odds?
Yes. Select Decimal Odds, enter your odds and select Convert Odds. The calculator will display the fractional equivalent automatically.
Can I convert American odds to decimal odds?
Yes. Select American Odds and enter odds such as +150 or -200. The calculator will convert them to decimal and fractional odds.
What does 2.00 mean in decimal odds?
Decimal odds of 2.00 represent a potential total return of R2 for every R1 staked if the bet wins. For example, a R100 stake would have a potential return of R200.
What are 2.50 decimal odds in American odds?
Decimal odds of 2.50 are equivalent to +150 American odds and 3/2 fractional odds.
Can I use these converted odds with an accumulator?
Yes, the converter can help you understand odds in different formats. If you want to combine several decimal odds and calculate the potential return, use our Accumulator Calculator South Africa.
Gamble Responsibly
Betting involves financial risk. Odds and implied probability do not predict sporting results or guarantee that a bet will win. Only bet with money you can afford to lose. This calculator is provided for informational and mathematical purposes. 18+ only. Gamble responsibly.