Type any format. The others update instantly.
Sportsbooks publish odds in different formats depending on the region. American (+150, −200) dominates US books, decimal (2.50) is standard in Europe and most exchanges, fractional (3/2) is the traditional UK and horse-racing notation, and Hong Kong, Indonesian, and Malay are common across Asian markets. The numbers all describe the same underlying probability. They're just different ways to write it down.
This tool converts between all seven formats at once. Type a value in any field and the other six update instantly, so you can compare prices across books that quote in different formats or sanity-check a number you've been given.
The table below shows the same odds expressed in every format. A +150 underdog in American is the same bet as 2.50 decimal, 3/2 fractional, or a 40% implied win probability.
| Scenario | Decimal | American | Fractional | Implied % | HK | Indo | Malay |
|---|---|---|---|---|---|---|---|
| Heavy favourite | 1.25 | −400 | 1/4 | 80.00 | 0.25 | −4.00 | −0.25 |
| Slight favourite | 1.67 | −149 | 2/3 | 59.88 | 0.67 | −1.49 | −0.67 |
| Even money | 2.00 | +100 | 1/1 | 50.00 | 1.00 | 1.00 | 1.00 |
| Slight underdog | 2.50 | +150 | 3/2 | 40.00 | 1.50 | 1.50 | −0.67 |
| Heavy underdog | 5.00 | +400 | 4/1 | 20.00 | 4.00 | 4.00 | −0.25 |
Sportsbooks build a margin (the vig or juice) into their lines, so the implied probabilities on both sides of a market typically add up to more than 100%. Comparing the book's implied number to your own model is the simplest first check before placing a bet.
