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Betting odds and total returns
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Decimal odds include the original stake in a winning return. Fractional odds describe profit relative to that stake.
Read the price format
At decimal odds of 2.50, a successful €10 single returns €25 in total. Subtracting the €10 stake leaves €15 profit. Fractional odds of 3/2 express the same profit-to-stake relationship.
A simple implied probability is one divided by the decimal price. At 2.50, that calculation gives 40%. It is a price-based figure, not a guarantee or a measurement of the true chance of the result.
Work through one example
The prices offered across all outcomes commonly include a bookmaker margin. Comparing the total implied probabilities helps explain why market prices cannot simply be read as a neutral forecast.
Check whether the amount shown on a slip is total return or profit. Free bets, each-way bets and special settlement terms can treat the original stake differently from the ordinary single-bet example.
A price is not a prediction
Quick checklist
- decimal odds
- implied probability
- odds format
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