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Odds converter
Type odds the way your book shows them, American (-110, +150), decimal (2.50) or fractional (5/2), and see every other format plus the win chance the price implies.
Conversion formulas
| From | To decimal |
|---|---|
| American, positive (+150) | 1 + 150 / 100 = 2.50 |
| American, negative (-110) | 1 + 100 / 110 = 1.909 |
| Fractional (5/2) | 1 + 5 / 2 = 3.50 |
And back: decimal 2.0 or more is American +(decimal − 1) × 100; under 2.0 it's American −100 / (decimal − 1).
Common odds
| American | Decimal | Fractional | Implied chance |
|---|---|---|---|
| -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% |
New to American odds? Read how to read American odds.
Questions
How do you convert American odds to decimal?
For positive odds, divide by 100 and add 1 (+150 is 2.50). For negative odds, divide 100 by the odds without the minus sign and add 1 (-110 is 1.909).
What is -110 in decimal odds?
1.909. A $110 bet at -110 returns $210 in total, $100 of it profit.
What does +200 mean?
A $100 bet wins $200 profit, decimal odds 3.00 and an implied chance of 33.33%.
Related
The board does this math on every game, at every book.See today's 24 bets
Updated 2026-10-26