Odds Converter: American, Decimal & Implied Probability
Type a price in any format and get the others instantly — American, decimal, fractional and implied probability — plus the profit and total return on your stake.
Odds converter
- American
- −110
- Decimal
- 1.91
- Fractional
- 10/11
- Implied probability
- 52.38%
- Profit if it wins
- $90.91
- Total return
- $190.91
Conversion formulas
| From → to | Formula | Example |
|---|---|---|
| American (+) → decimal | 1 + odds / 100 | +150 → 2.50 |
| American (−) → decimal | 1 + 100 / |odds| | −110 → 1.91 |
| Decimal ≥ 2 → American | (decimal − 1) × 100 | 3.00 → +200 |
| Decimal < 2 → American | −100 / (decimal − 1) | 1.40 → −250 |
| Fractional → decimal | 1 + a / b | 5/2 → 3.50 |
| Any → implied probability | 1 / decimal | 2.50 → 40% |
Common prices
| American | Decimal | Fractional | Implied |
|---|---|---|---|
| −300 | 1.33 | 1/3 | 75.00% |
| −200 | 1.50 | 1/2 | 66.67% |
| −150 | 1.67 | 2/3 | 60.00% |
| −120 | 1.83 | 5/6 | 54.55% |
| −110 | 1.91 | 10/11 | 52.38% |
| +100 | 2.00 | 1/1 | 50.00% |
| +120 | 2.20 | 6/5 | 45.45% |
| +150 | 2.50 | 3/2 | 40.00% |
| +200 | 3.00 | 2/1 | 33.33% |
| +300 | 4.00 | 3/1 | 25.00% |
Implied probability includes the book’s margin. To get the no-vig chance of each side, you also need the other side’s price — that is what the no-vig calculator does.
Frequently asked questions
How do I convert American odds to decimal?
For positive odds, divide by 100 and add 1 (+150 becomes 2.50). For negative odds, divide 100 by the odds without the minus sign and add 1 (−110 becomes 1.91).
How do I convert decimal odds to American?
If the decimal is 2.00 or more, subtract 1 and multiply by 100 (2.50 becomes +150). If it is below 2.00, divide −100 by the decimal minus 1 (1.50 becomes −200).
How do I convert odds to implied probability?
Divide 1 by the decimal odds. In American odds, use 100 / (odds + 100) for positive prices and |odds| / (|odds| + 100) for negative ones. −110 implies 52.38%; +150 implies 40%.
What is −110 in fractional odds?
−110 is 10/11: you win 10 for every 11 staked. +250 is 5/2 and +100 (even money) is 1/1.
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