What is an accumulator?
An accumulator — an "acca", or a "parlay" in the US — rolls several selections into one bet. The odds of every leg multiply together, so a handful of modest prices can turn into a big payout. The catch: every single selection must win. One loser and the whole bet is gone, no matter how many others came in.
That all-or-nothing nature is why accumulators are thrilling but unforgiving — and why full-cover bets like a Lucky 15 exist as a safety-net alternative.
How to use the calculator
Set the folds
How many selections, from 2 to 10.
Enter each price
The decimal odds per selection.
Add your stake
One stake — it's a single bet.
Read the returns
Total odds, return and profit.
Worked example
A four-fold with each selection at odds of 2.00, staking €10:
- Total odds = 2.00 × 2.00 × 2.00 × 2.00 = 16.00
- Return = €10 × 16.00 = €160 (a €150 profit)
- But if any one of the four loses, the return is €0.
Notice how the odds compound: add a fifth leg at 2.00 and the payout doubles to €320 — but your chance of landing all five drops sharply. That trade-off is the whole story of accumulators.
Accumulator vs full-cover bets
A straight accumulator is one bet that needs every leg to win. Full-cover bets spread the same selections across many smaller bets so partial winners still pay:
- A Lucky 15 (4 selections) = 15 bets, and one winner already returns money.
- A Yankee (4 selections) = 11 bets, needing two winners.
- A Trixie (3 selections) = 4 bets.
They cost more up front than a single acca, but they don't die on one unlucky leg. Switch the bet type in the calculator above to compare them.
More multiples & system bet calculators
Same engine, every popular bet type — switch type in the calculator above, or jump straight to:
Learn more about arbitrage betting
New to this? Read our full guide on what is arbitrage betting, or see the arbitrage betting formula explained step by step with worked examples. Odds in a different format? Use our odds converter to switch between decimal, fractional, American and implied probability.
Frequently asked questions
- What is an accumulator bet?
- An accumulator (or "acca", or "parlay" in the US) combines several selections into a single bet. The odds of every selection multiply together, so the potential payout is large - but every selection must win, or the whole bet loses.
- How are accumulator odds calculated?
- You multiply the decimal odds of each selection. Four selections at 2.00 give 2.00 x 2.00 x 2.00 x 2.00 = 16.00, so a EUR10 stake returns EUR160. The calculator does this instantly as you type.
- What happens if one selection loses?
- The entire accumulator loses. Unlike full-cover bets such as a Lucky 15, an acca has no safety net - one losing leg means no return, however many others won.
- What is the difference between an acca and a parlay?
- Nothing - they are the same bet. "Accumulator" or "acca" is the UK/European term; "parlay" is the American term for combining multiple selections into one multiplied bet.
- What happens if a selection is void?
- A void selection (postponed match, non-runner) is usually treated as odds of 1.00 - it drops out and the accumulator runs on the remaining selections, reducing the total odds accordingly.
- Is an accumulator a good bet?
- Accumulators offer a big payout from a small stake, which is the appeal - but each added leg multiplies the bookmaker's margin against you, so the long-term maths is tougher the more selections you add. They are fun as an occasional punt, not a reliable strategy.