Fractional and Decimal Odds: An Ireland Betting Guide
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Fractional and decimal odds express the price of a selection in different formats. Decimal odds include the returned stake in the total return; fractional odds show potential profit relative to the stake.
Multiply a stake by decimal odds to calculate the stake-inclusive potential return. Subtract the original stake from that return to find the potential profit. The linked calculator performs both calculations from the values you enter.
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Reading fractional odds
Fractional odds of 5/2 mean a potential profit of €5 for every €2 staked, with the original stake returned as well if the selection wins. Divide the numerator by the denominator and add one to convert to decimal: 5/2 becomes 3.50.
Implied probability
A simple implied-probability estimate for decimal odds is 1 divided by the decimal price, expressed as a percentage. This does not account for the full bookmaker margin or guarantee the event's true chance. Use the odds shown in the current event listing.
Quick answers
Frequently asked questions
Do decimal odds include my stake?+
Yes. The decimal-odds return includes the original stake.
How do I convert fractional odds to decimal?+
Divide the first number by the second, then add one.
