An accumulator combines selections from separate markets into one bet. With decimal odds, the combined price is found by multiplying the individual prices, not by adding them.
The arithmetic is only one part of the decision. A standard accumulator generally needs every remaining leg to win, while a void leg may reduce the multiple under the provider’s rules. Correlated selections can also make a multiple less independent than it appears.
How decimal accumulator odds are multiplied
Multiply each leg’s decimal price to obtain a combined decimal price. The combined price is then multiplied by the wagered stake to show the total return, which normally includes the original stake.
Hypothetical example: three legs priced at 1.80, 2.20 and 1.50 produce combined odds of 5.94. A €10 stake would show a total return of €59.40 if all three selections win. The gross profit before any separate cost is €49.40.
- Combined odds: 1.80 × 2.20 × 1.50 = 5.94
- Hypothetical €10 stake × 5.94 = €59.40 total return
- Gross profit before separate costs: €59.40 − €10 = €49.40
Keep the stake and any fee separate
The stake is the amount placed into the accumulator. A service fee, subscription cost or other charge is a separate outlay unless the provider explicitly says it is included in the wager. Do not treat a fee as extra stake when calculating the displayed betting return.
Hypothetical example: the €10 accumulator above wins and a separate €2 service fee was paid. The total cash outlay is €12, the betting return is €59.40, and the amount left after subtracting both stake and fee is €47.40 before tax or any other cost. This is arithmetic, not a prediction.
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Every non-void leg normally has to win
In a standard accumulator, one losing selection usually makes the whole multiple a loser. A void selection is different: Betfair says a multiple can be adjusted to the remaining legs, and bet365 describes an accumulator as being settled on the remaining selections when one is void.
The exact result can depend on the provider, market and reason for the void. Check whether a postponed fixture, non-runner or abandoned match is cancelled, reduced to a smaller multiple or treated under a special rule.
Correlated selections need extra care
Two selections are correlated when the outcome of one is linked to the other. For example, a home win and that same team to lead at half-time are not independent ideas. Their combined price should not be read as if they were unrelated events, and some providers restrict or reprice certain combinations.
A longer accumulator also increases the number of conditions that must be settled correctly. Multiplication can make the displayed price look large without turning the selection into a reliable outcome.
Odds are not the true winning probability
For decimal odds, dividing 1 by the price gives a raw implied percentage before considering the provider’s margin and other market effects. In the hypothetical 5.94 example, that calculation is about 16.84%, but it is not a measured or guaranteed probability that the accumulator will win.
Prices can reflect margin, information, limits and the way a market is formed. Treat the calculation as a way to understand the quote and settlement mechanics, not as proof of an edge or a future result.
Accumulator odds calculator
Hypothetical independent selections, with no voids or special pricing. This does not submit or fund a bet.
A losing leg can lose the entire stake. Related selections, voids and bookmaker rules can change the price or settlement. The displayed return is arithmetic, not a guarantee.
Sources and settlement references
These links support the market explanations. They are not endorsements of a bookmaker, proof of our performance, or substitutes for your specific bet's rules.
