What is an accumulator?
An accumulator combines multiple selections into one bet. Instead of the winnings sitting still, the return from each winning leg is automatically staked on the next, so the odds multiply together rather than simply adding up.
The family of multiple bets is named by the number of selections:
- Double, 2 selections
- Treble, 3 selections
- Accumulator (acca), 4 or more selections
The catch is simple and unforgiving: every selection must win. One losing leg and the whole bet is lost.
How the odds multiply
To find the odds of an accumulator, convert each price to decimal and multiply them together.
A worked example
A £10 treble on three horses priced 2/1, 3/1 and 4/1 (decimal 3.0, 4.0, 5.0):
- £10 × 3.0 = £30 after leg one
- £30 × 4.0 = £120 after leg two
- £120 × 5.0 = £600 after leg three
A £10 stake returns £600, but all three horses had to win. Backed as three separate £10 win bets, three winners would return just £130.
The honest trade-off
Accumulators offer eye-catching returns from a small stake, which is their appeal. But the probability of landing every leg drops sharply with each one you add, a four-fold of even-money shots already has only around a 1-in-16 chance. Treat accas as a small-stakes bit of fun, not a strategy.
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