Odds Converter
Convert between decimal, fractional, and American odds formats instantly. Change any field and the others update automatically.
How to Convert Betting Odds
Betting odds are displayed in three main formats around the world: decimal, fractional, and American (moneyline). Each format represents the same underlying probability and potential payout, just expressed differently. Understanding all three is essential if you bet across international bookmakers or follow tipsters who use different formats.
Our free odds converter instantly translates between all three formats and shows you the implied probability, so you always know exactly what the bookmaker thinks about the likelihood of an outcome.
Decimal Odds Explained
Decimal odds are the most common format in Europe, Australia, and on betting exchanges. They represent the total return per unit staked, including your original stake. For example, decimal odds of 2.50 mean that for every $1 you bet, you receive $2.50 back if your bet wins — that is $1.50 profit plus your $1 stake. Decimal odds always include your stake, so they are never lower than 1.00. The higher the number, the bigger the potential return and the less likely the bookmaker considers the outcome.
Fractional Odds Explained
Fractional odds are the traditional UK format, often used at horse racing meetings and by British bookmakers. They show the profit relative to the stake. For example, 3/2 means you win $3 profit for every $2 staked. To convert fractional odds to decimal, divide the numerator by the denominator and add 1. So 3/2 becomes 1.5 + 1 = 2.50 in decimal. Fractions like 1/1 (evens) mean you double your money, equivalent to decimal 2.00.
American Odds Explained
American odds (also called moneyline odds) are standard in the United States. Positive odds show how much profit you make on a $100 stake: +150 means $150 profit from a $100 bet. Negative odds show how much you need to stake to win $100: -200 means you must bet $200 to win $100 profit. Positive numbers indicate underdogs, while negative numbers indicate favourites.
What is Implied Probability?
Implied probability converts odds into a percentage that reflects how likely the bookmaker considers an outcome. The formula is simple: Implied Probability = (1 / Decimal Odds) x 100. For example, decimal odds of 2.50 give an implied probability of 40%. This means the bookmaker estimates a 40% chance of that outcome occurring. Comparing implied probability to your own assessment is the foundation of value betting — if you believe the true probability is higher than the implied probability, you have found a value bet.