Betting Odds Converter
Convert between American, decimal, and fractional odds instantly. See the implied probability for any odds format.
Odds Converter
Common Odds Reference
| American | Decimal | Fractional | Implied Prob |
|---|---|---|---|
| -500 | 1.20 | 1/5 | 83.3% |
| -200 | 1.50 | 1/2 | 66.7% |
| -110 | 1.91 | 10/11 | 52.4% |
| +100 | 2.00 | 1/1 | 50.0% |
| +150 | 2.50 | 3/2 | 40.0% |
| +200 | 3.00 | 2/1 | 33.3% |
| +500 | 6.00 | 5/1 | 16.7% |
How to Use Odds Conversion
American odds are the most common format in the US. Negative numbers (like -110) tell you how much to bet to win $100. Positive numbers (like +250) tell you how much you win on a $100 bet.
Decimal odds are popular in Europe and Australia. They represent the total payout (including your stake) per $1 wagered. Decimal 2.50 means a $1 bet returns $2.50 total ($1.50 profit).
Fractional odds are traditional in the UK. 5/2 means you win $5 for every $2 staked. The implied probability is the denominator divided by the sum of both numbers.
Implied probability tells you what percentage of the time an outcome needs to happen for the bet to break even. If implied probability is 52.4% but your model says the true probability is 58%, you have a positive expected value bet.
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