Odds converter
Every betting price is a probability wearing a regional costume. Type a price in any format and read the other two — and, more usefully, the implied probability underneath it.
e.g. 2.50 — total return per unit staked
e.g. 6/4 — profit over stake
e.g. +150 or -200
what the price says the chance is
Decimal 2.00 = fractional 1/1 = American +100 — an implied 50.0% chance.
The formulas this tool runs
| Conversion | Formula | Example (2.50) |
|---|---|---|
| Decimal → implied probability | 1 ÷ decimal | 1 ÷ 2.50 = 40% |
| Decimal → fractional | decimal − 1, as a fraction | 1.50 = 6/4 |
| Decimal → American (≥ 2.00) | (decimal − 1) × 100 | +150 |
| Decimal → American (< 2.00) | −100 ÷ (decimal − 1) | 1.50 → −200 |
Quick reference
| Decimal | Fractional | American | Implied |
|---|---|---|---|
| 1.20 | 1/5 | −500 | 83.3% |
| 1.50 | 1/2 | −200 | 66.7% |
| 2.00 | 1/1 | +100 | 50.0% |
| 2.50 | 6/4 | +150 | 40.0% |
| 3.00 | 2/1 | +200 | 33.3% |
| 5.00 | 4/1 | +400 | 20.0% |
| 11.00 | 10/1 | +1000 | 9.1% |
One honest caveat: implied is not true probability
The implied probability of a single price includes the bookmaker's margin. Sum the implied probabilities of every outcome in a market and you will get more than 100% — the excess is the operator's cut, and it means each individual price slightly overstates the real chance. The full walk-through of that arithmetic, with worked examples, is in how to convert odds to implied probability, and where each notation comes from — and why analysts default to decimal — is in betting odds formats explained. Our match pages publish the model's own probability next to the market price for exactly this comparison.