Convert betting odds between decimal, fractional and American formats instantly
Our free tool converts betting odds between the three main formats used worldwide. Simply enter a value in any format to see all conversions and the implied probability.
Decimal
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Fractional (UK)
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American (US)
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Implied Probability
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Decimal odds represent the total payout per unit staked, including your original stake. They are the most widely used format in Europe, Australia and Canada. For example, odds of 2.50 mean that for every €1 you bet, you receive €2.50 in total (€1.50 profit + €1 stake).
To convert fractional odds to decimal, divide the first number by the second and add 1. For example, 6/4 becomes (6 ÷ 4) + 1 = 2.50. This means a £4 bet returns £10 total (£6 profit + £4 stake).
American odds use a baseline of $100. Positive odds (+150) show how much profit you make on a $100 bet. Negative odds (-200) show how much you need to bet to make $100 profit. Favorites have negative odds, underdogs have positive odds.
Implied probability is the likelihood of an outcome as suggested by the betting odds. It is calculated by dividing 1 by the decimal odds. For example, decimal odds of 2.50 give an implied probability of 40% (1 ÷ 2.50 = 0.40). This helps you assess whether a bet offers value.
Decimal odds are the most widely used globally, especially in Europe, Australia and Canada. Fractional odds are traditional in the UK and Ireland. American odds are standard in the United States. Most online bookmakers let you switch between formats.
