How to Convert Sports Betting Odds
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Sports betting odds can be displayed in different formats, but they all represent the same core concepts: potential payouts and implied probability. Below is a quick guide to converting between the most common types of odds: Fractional, Decimal, American, and Implied Probability.

1. Fractional Odds
Fractional odds, such as 5/1, are common in the UK. The first number represents your potential profit, and the second number is your stake. To convert fractional odds to decimal, add 1 to the fraction (numerator/denominator + 1). To convert fractional to American odds, first convert the fractional odds to decimal and then use the formula for American odds. To calculate the implied probability from fractional odds, divide the denominator by the total of the numerator and denominator.

2. Decimal Odds
Decimal odds, such as 6.00, show your total payout, including the stake. To convert decimal odds to fractional, subtract 1 from the decimal and express the result as a fraction. To convert decimal odds to American, for odds greater than 2.00, use the formula +((decimal - 1) * 100); for odds below 2.00, use -(100 / (decimal - 1)). To calculate the implied probability from decimal odds, divide 1 by the decimal odds.

3. American Odds
American odds, such as +500 or -200, are popular in the US. Positive odds show how much profit you would make on a $100 bet, while negative odds show how much you need to bet to win $100. To convert American odds to decimal, divide positive odds by 100 and add 1; for negative odds, divide 100 by the absolute value of the odds and add 1. To convert to fractional, first convert the decimal odds to fractional. To calculate the implied probability, for positive odds, divide 100 by the odds plus 100; for negative odds, divide the absolute value of the odds by the sum of the absolute value and 100.

4. Implied Probability
Implied Probability represents the percentage chance of an event occurring. To convert implied probability to decimal, divide 1 by the implied probability expressed as a decimal. To convert to fractional, first convert the decimal odds to fractional. To convert to American odds, if the implied probability is less than 50%, use the formula +((1 / implied) - 1) * 100; if it’s more than 50%, use -(100 / ((1 / implied) - 1)).