Odds Converter
Convert between American, decimal, and fractional odds. See implied probability instantly.
How to Convert Betting Odds
Sportsbooks display odds in three main formats: American (moneyline), Decimal, and Fractional. They all express the same thing — the ratio of payout to stake — just in different notation. This converter handles all three and shows you the implied probability behind any odds.
Understanding the Three Odds Formats
American odds are the standard in U.S. sportsbooks. Positive numbers (like +200) show how much profit you'd make on a $100 bet. Negative numbers (like -150) show how much you need to wager to profit $100.
Decimal odds represent your total return per dollar wagered, including your stake. Odds of 2.50 mean a $100 bet returns $250 total. This format is standard in Europe, Canada, and Australia.
Fractional odds show profit relative to stake. Odds of 3/1 mean you win $3 for every $1 wagered. This format is traditional in UK horse racing.
Common Odds Conversions
| 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% |
| +300 | 4.00 | 3/1 | 25.0% |
| +500 | 6.00 | 5/1 | 16.7% |
| +1000 | 11.00 | 10/1 | 9.1% |
What Is Implied Probability?
Implied probability converts odds into a percentage representing how likely the sportsbook considers an outcome. It's calculated as 1 / decimal odds × 100. Understanding implied probability helps you spot value — when you believe the true probability of an outcome is higher than what the odds suggest.