Odds conversion formulas
positive American → decimal: 1 + odds ÷ 100 · negative American → decimal: 1 + 100 ÷ |odds|
implied probability = 1 ÷ decimal odds
Common odds conversion table
| American | Decimal | Fractional | Implied probability |
|---|---|---|---|
| -300 | 1.333 | 1/3 | 75.00% |
| -200 | 1.500 | 1/2 | 66.67% |
| -150 | 1.667 | 2/3 | 60.00% |
| -110 | 1.909 | 10/11 | 52.38% |
| +100 | 2.000 | 1/1 | 50.00% |
| +150 | 2.500 | 3/2 | 40.00% |
| +200 | 3.000 | 2/1 | 33.33% |
| +300 | 4.000 | 3/1 | 25.00% |
| +500 | 6.000 | 5/1 | 16.67% |
FAQ
What do American odds mean?
Positive American odds show the profit on a $100 bet: +150 wins $150. Negative odds show how much you must bet to win $100: -150 means betting $150 to win $100.
What are decimal odds?
Decimal odds show the total return per $1 bet, stake included. 2.50 returns $2.50 for every $1, which is $1.50 profit. They're the easiest format to do math with.
What is implied probability?
The win probability a price implies: 1 divided by the decimal odds. Sportsbook prices include vig, so implied probabilities on all sides of a market add up to more than 100%.