Odds Converter — American, decimal, fractional & implied probability
Convert any betting price into every other format and see the implied probability — the win rate you need just to break even at that number.
American
-110
Decimal
1.909
Fractional
10/11
Implied probability
52.38%
Profit
$90.91
Total payout
$190.91
The formulas behind the conversion
- Positive American to probability: 100 ÷ (odds + 100)
- Negative American to probability: |odds| ÷ (|odds| + 100)
- Decimal to probability: 1 ÷ decimal
- Fractional to decimal: (numerator ÷ denominator) + 1
Implied probability is not true probability
Every posted price includes the book's margin, so implied probabilities across a market add up to more than 100%. Strip that margin out with a devig calculator before judging whether a bet has real value.
Common reference prices
| American | Decimal | Break-even |
|---|---|---|
| -200 | 1.500 | 66.7% |
| -150 | 1.667 | 60.0% |
| -119 | 1.840 | 54.3% |
| -110 | 1.909 | 52.4% |
| +100 | 2.000 | 50.0% |
| +150 | 2.500 | 40.0% |
| +200 | 3.000 | 33.3% |
| +300 | 4.000 | 25.0% |