Enter any line in any notation. The other six fill in as you type.
Behind every line on a sportsbook screen is one number: the implied probability the bookmaker is pricing the outcome at. The format you see is just how that probability is rendered. Decimal at most exchanges and across Europe, fractional at UK windows and on horse racing boards, American everywhere in the US, and three further variants (Hong Kong, Indonesian, Malay) common across Asian markets. Same maths underneath, different way of writing it down.
This tool reads any of the seven and instantly shows the other six. Useful for comparing prices across books that quote in different conventions, or working backwards from a probability estimate to see what the equivalent American or fractional line would look like.
The table below lists five common price points and shows each one in every format. A 40% implied probability, for example, is the same bet whether your book displays it as 2.50, +150, 3/2, or any of the Asian variants.
| Scenario | Decimal | American | Fractional | Implied % | HK | Indo | Malay |
|---|---|---|---|---|---|---|---|
| Strong chalk | 1.25 | −400 | 1/4 | 80.00 | 0.25 | −4.00 | −0.25 |
| Marginal favourite | 1.67 | −149 | 2/3 | 59.88 | 0.67 | −1.49 | −0.67 |
| Pick'em | 2.00 | +100 | 1/1 | 50.00 | 1.00 | 1.00 | 1.00 |
| Marginal underdog | 2.50 | +150 | 3/2 | 40.00 | 1.50 | 1.50 | −0.67 |
| Long dog | 5.00 | +400 | 4/1 | 20.00 | 4.00 | 4.00 | −0.25 |
Every market on a sportsbook screen has the operator's margin (the vig, the juice, the overround) baked into both sides of the line, so summed implied probabilities across a two-way market almost always exceed 100%. Comparing the book's implied figure to your own estimate is the shortest sanity-check available before staking.
