Accumulator (acca)
An accumulator puts several selections on one bet slip; it only wins if every selection wins. The odds multiply, but so do the probabilities: three selections at 60% each have only a 21.6% chance of all coming in.
In an accumulator, the total odds are the product of each selection’s odds, which is its appeal: three modest prices quickly add up to a big potential return. But the chance of success follows the same logic: if the matches are independent, it equals the product of each selection’s probability. A single miss is enough to lose the whole slip.
What people often forget is that the bookmaker's margin multiplies too. If each price is slightly below its « fair » value, the gap compounds with every selection you add. A bet that costs 4% in expected value as a single can cost more than 11% as a treble: the longer the acca, the worse the expectation.
Watch out, too, for correlated selections (for example one team winning and « over 2.5 goals » in the same match): many bookmakers refuse them or adjust the price, precisely because the simple product of probabilities no longer applies.
Accumulators aren't ruled out by maths, but they turn sensible bets into a lottery. They multiply the risk: it is worth being aware of it and only putting in small amounts you can afford to lose.
Example
Three selections, each with a true probability of 60% (fair odds ≈ 1.67), offered at 1.60. Acca odds: 1.60 × 1.60 × 1.60 = 4.096; a £10 stake returns £40.96 if everything lands. True probability: 0.6 × 0.6 × 0.6 = 21.6%. Expected value: 0.216 × 4.096 − 1 ≈ −11.5% of the stake, against −4% for each single (0.6 × 1.60 − 1).
Betting involves risks: losing money, debt, addiction. Betting is for adults only. Never stake more than you can afford to lose. Elofoot is a data analysis tool: it takes no bets and no prediction is guaranteed.
Frequently asked questions
- How do you calculate accumulator odds?
- Multiply the odds of every selection. Three prices of 1.60 give 1.60 × 1.60 × 1.60 = 4.096.
- What are the chances of winning an accumulator?
- For independent matches, it is the product of each selection’s probability. Three selections at 60% only all come in 21.6% of the time.
- Why is an acca riskier than a single?
- Because every selection has to win and the bookmaker's margin compounds with each leg. The potential return goes up, but the chance of winning and the expected value go down.
See also
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