Convert between decimal, fractional, American, and implied probability formats for any odds.
Different regions and bookmakers use various formats to express betting odds. The most common formats are decimal (popular in Europe, Australia, and Canada), fractional (traditional in the UK and Ireland), and American (used in the United States).
Understanding how to convert between these formats is essential for comparing odds across different bookmakers and calculating potential returns accurately.
This calculator allows you to quickly convert between all major odds formats and see the implied probability, helping you make more informed betting decisions.
Enter odds in any format to convert between decimal, fractional, American, and implied probability.
Decimal odds represent the total return you receive for each unit staked, including your original stake.
Formula: Total Return = Stake × Decimal Odds
Example: $100 stake at 2.50 odds = $250 total return ($150 profit)
Fractional odds (such as 3/1) represent the ratio of profit to stake. The first number is how much you'll win, and the second is how much you bet.
Formula: Profit = Stake × (Numerator ÷ Denominator)
Example: $100 stake at 3/2 odds = $150 profit ($250 total return)
American odds can be positive (+) or negative (-). Positive odds show how much profit you'd make on a $100 stake, while negative odds show how much you need to stake to win $100 profit.
Positive Odds Formula: Profit = Stake × (American Odds ÷ 100)
Example: $100 stake at +150 odds = $150 profit ($250 total return)
Negative Odds Formula: Profit = Stake × (100 ÷ |American Odds|)
Example: $200 stake at -200 odds = $100 profit ($300 total return)
Implied probability represents the bookmaker's assessment of the likelihood of an event occurring, expressed as a percentage.
Formula from Decimal: Implied Probability = 1 ÷ Decimal Odds × 100%
Example: Decimal odds of 2.50 = 40% implied probability