How to Calculate Parlay Bet Odds A parlay bet is a single wager that requires two or more outcomes to all win. The parlay calculator allows you to input your stake & odds in American formats to. To convert decimal odds to fractional odds, simply subtract 1 from the decimal, and then convert the remaining decimal number into a fraction. 2.5 – 1 = 1.5; 1.5 = 3/2. Converting American Odds/Moneyline Odds to Fractional & Decimal Odds. American odds are a little trickier, as they operate using positive and negative odds.

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By convention only a set of fractions are used in fractional odds betting markets. The set does not include exact mathematical equivalents to all possible decimal and American odds. We use the closet fraction that is used in betting markets.

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For example, the exact mathematical equivalent of decimal odds 30 is fractional odds 29/1. However 29/1 is not used in betting markets, instead 30/1 is used, so that is what appears in this converter.

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For an explanation of the odds types on this table see decimal, fractional and American odds. To find out what the numbers really represent see understand odds as probability with overround.

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