Odds Converter
Convert betting odds between decimal, fractional, American (moneyline), and implied probability formats instantly.
Used in Europe and Australia. Always ≥ 1.
Used in the UK and Ireland. Format: numerator/denominator.
Used in the US. Positive = underdog, negative = favourite.
The chance of winning implied by the odds.
How to use the odds converter
Enter a value in any of the four fields and all other formats will update instantly. You can start from decimal, fractional, American moneyline odds, or an implied probability percentage.
Odds formats explained
Decimal odds
The most common format in Europe, Australia, and Canada. Decimal odds represent the total payout per unit staked, including your stake. Odds of 2.50 mean you receive £2.50 for every £1 bet (£1.50 profit + £1 stake). Decimal odds are always greater than 1.
Fractional odds
The traditional format used by bookmakers in the UK and Ireland. Fractional odds show the profit relative to the stake. 3/2 means you win £3 for every £2 staked. The implied probability is the denominator divided by the sum of both numbers: 2 ÷ (3 + 2) = 40%.
American (moneyline) odds
Standard in the United States. Positive odds (e.g. +150) show how much profit a $100 bet returns. Negative odds (e.g. −200) show how much you must stake to win $100 profit. +150 and −200 are not equivalent — they represent different probabilities.
Implied probability
The probability of an outcome implied by the odds, expressed as a percentage. A 40% implied probability means the bookmaker believes there is roughly a 40% chance of that outcome occurring. Note that bookmakers build a margin into their odds, so the sum of implied probabilities across all outcomes in an event will exceed 100%.
Conversion formulas
| From | To Decimal |
|---|---|
| Fractional (n/d) | (n ÷ d) + 1 |
| American (+) | (odds ÷ 100) + 1 |
| American (−) | (100 ÷ |odds|) + 1 |
| Probability (%) | 100 ÷ probability |