The four formats
| Format | Example | How to read it |
|---|---|---|
| Decimal (France, Europe) | 2,50 | Total return per €1 staked, stake included |
| American | +150 | Profit per $100 staked (or stake needed to win $100 if negative) |
| Fractional (UK) | 3/2 | Net profit relative to the stake |
| Hong Kong | 1,50 | Net profit per €1 staked |
Decimal ≥ 2 → US: (odds − 1) × 100
Decimal < 2 → US: −100 / (odds − 1)
The implied probability trap
The probability shown by the conversion is an implied probability: it contains the bookmaker's margin. On a two-way match, the two implied probabilities always add up to more than 100%.
To get the probability the market actually estimates, that margin has to be removed — see the fair odds calculator.
Frequently asked questions
Do value betting tools use decimal odds?
For the French market, yes: ANJ-licensed operators all price in decimal, and Stats&Bet shows its alerts and comparison in that format. No conversion is needed between the alert and the bookmaker's site.
Why does France use decimal odds?
It is the continental European standard, and the clearest: decimal odds directly give the total return per €1 staked. Every ANJ-licensed operator uses it, even if some offer an alternative display in their settings.
Do fractional odds include the stake?
No, it expresses net profit: 3/2 means €3 of profit for €2 staked, i.e. decimal odds of 2.50. It is the most common source of error when reading British sources.