Odds converter — American, decimal, fractional and implied probability
Type a price into any box — American, decimal, fractional or a percentage — and the other three follow. Nothing is sent anywhere.
+150 is 2.5 in decimal and 3/2 fractional, and implies 40%. A $100 bet at this price pays $150.00 profit.
The implied probability is the price as a percentage, vig included — not an estimate of the outcome.
Odds conversion chart
| American odds | Decimal odds | Fractional odds | Implied probability (%) |
|---|---|---|---|
| -1000 | 1.1 | 1/10 | 90.9% |
| -500 | 1.2 | 1/5 | 83.3% |
| -300 | 1.333 | 1/3 | 75.0% |
| -250 | 1.4 | 2/5 | 71.4% |
| -200 | 1.5 | 1/2 | 66.7% |
| -175 | 1.571 | 4/7 | 63.6% |
| -150 | 1.667 | 2/3 | 60.0% |
| -130 | 1.769 | 10/13 | 56.5% |
| -120 | 1.833 | 5/6 | 54.5% |
| -110 | 1.909 | 10/11 | 52.4% |
| -105 | 1.952 | 20/21 | 51.2% |
| +100 | 2 | 1/1 | 50.0% |
| +105 | 2.05 | 21/20 | 48.8% |
| +110 | 2.1 | 11/10 | 47.6% |
| +120 | 2.2 | 6/5 | 45.5% |
| +130 | 2.3 | 13/10 | 43.5% |
| +150 | 2.5 | 3/2 | 40.0% |
| +175 | 2.75 | 7/4 | 36.4% |
| +200 | 3 | 2/1 | 33.3% |
| +250 | 3.5 | 5/2 | 28.6% |
| +300 | 4 | 3/1 | 25.0% |
| +400 | 5 | 4/1 | 20.0% |
| +500 | 6 | 5/1 | 16.7% |
| +1000 | 11 | 10/1 | 9.1% |
How odds are converted
To turn American odds into decimal, a positive price is divided by 100 and 1 is added: +150 is 1 + 150/100 = 2.50. A negative price is 1 + 100 divided by the price without its sign: −110 is 1 + 100/110 = 1.909.
Fractional odds are profit over stake, so decimal odds are the fraction plus 1: 3/2 is 1.5 + 1 = 2.50, and 10/11 is 1.909. Evens is 1/1, which is 2.00 in decimal and +100 in American.
Implied probability is 100 divided by the decimal odds: 2.50 implies 40%, and 1.909 implies 52.38%. Both sides of a market add up to more than 100% — the excess is the book's margin, so this is a price, not a forecast.
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