What are Odds Formats?
Definition: Odds formats are different ways of writing the same price. A sportsbook front-end can display decimal, fractional or American odds depending on the market and player settings.
The same price in three formats:
- Decimal 2.50 - a €10 stake returns €25 in total.
- Fractional 3/2 - profit of 3 for every 2 staked, so €15 profit on €10.
- American +150 - profit of 150 on a 100 stake.
Conversion rules:
- Fractional to decimal: a/b + 1 (3/2 + 1 = 2.50).
- Positive American to decimal: 1 + A/100 (+150 → 2.50).
- Negative American to decimal: 1 + 100/|A| (-200 → 1.50).
Where each format is used: decimal in Europe and Canada, fractional in the UK and Ireland, American in the US.
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