Odds say two things: how much you win, and how likely the bookmaker thinks the outcome is. Three formats describe the same thing.

Decimal (e.g. 2.50)

The most intuitive. Your total return per $1 staked, including your stake. A $10 bet at 2.50 returns $25 ($15 profit). Common in the UK, Europe and Australia.

Fractional (e.g. 3/2)

Traditional UK format. The profit relative to your stake: 3/2 means win $3 for every $2 staked. Add 1 (as a fraction) to get the decimal: 3/2 → 2.50.

American / Moneyline (e.g. +150 / −200)

Common in the US. Positive numbers show profit on a $100 stake (+150 = win $150). Negative numbers show how much you must stake to win $100 (−200 = stake $200 to win $100).

Implied probability

Any odds imply a probability: 1 ÷ decimal odds. So 2.50 implies 1 ÷ 2.50 = 40%. Note this includes the bookmaker’s margin, so it’s slightly higher than the “true” chance — that margin is how they profit.

Convert instantly

Our free Odds Converter turns any format into all three plus the implied probability. And if you’re combining selections, the Parlay Calculator multiplies them out for you.

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