Odds converter
Convert American odds (−110, +150) to decimal and implied probability, and back. Includes a reference table of common prices.
American odds → decimal
Decimal odds1.91
Implied prob.52.4%
Decimal odds → American
American odds+150
Implied prob.40.0%
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Common odds table
| American odds | Decimal odds | Implied prob. |
|---|---|---|
| -200 | 1.50 | 66.7% |
| -150 | 1.67 | 60.0% |
| -110 | 1.91 | 52.4% |
| +100 | 2.00 | 50.0% |
| +120 | 2.20 | 45.5% |
| +150 | 2.50 | 40.0% |
| +200 | 3.00 | 33.3% |
| +250 | 3.50 | 28.6% |
| +300 | 4.00 | 25.0% |
How are odds converted?
Positive odds: decimal = 1 + (odds ÷ 100), so +150 is 2.50. Negative odds: decimal = 1 + (100 ÷ |odds|), so −110 is 1.91. Implied probability is 1 ÷ decimal odds: it is what the book says the outcome is worth — if your true estimate is higher, the price has value.