Accumulator calculator
Calculate accumulator returns for any number of selections. Add your odds, enter your stake, and see your potential payout instantly.
Total returns
£360.00
Profit
£359.00
Combined odds
359/1
Implied probability
0.28%
Number of selections
4
| Selection | Name | Odds | Running Combined Odds |
|---|---|---|---|
| 1 | Selection 1 | 2/1 | 2/1 |
| 2 | Selection 2 | 3/1 | 11/1 |
| 3 | Selection 3 | 5/1 | 71/1 |
| 4 | Selection 4 | 4/1 | 359/1 |
What is an accumulator?
An accumulator (or acca) is a single bet that combines multiple selections. All selections must win for the bet to pay out. The appeal is that the odds multiply together — a 4-fold accumulator at 2/1, 3/1, 5/1, and 4/1 pays 119/1, turning a £1 stake into £120.
The trade-off is risk. If even one selection loses, the entire bet loses. The more selections you add, the higher the potential payout — but the lower the probability of winning.
How accumulator odds work
Each selection's odds are multiplied together to give the combined odds. In decimal format, this is straightforward: 3.00 × 4.00 × 6.00 × 5.00 = 360.00.
In fractional format, the maths is the same — the calculator converts to decimal, multiplies, and converts back. The combined odds grow exponentially as you add selections, which is why accumulators can produce such large returns from small stakes.
The reality of accumulator betting
Accumulators are popular because of the dream — a small stake winning thousands. But the implied probability tells a different story. A 10-fold accumulator where each selection has a 50% chance of winning has a combined probability of just 0.1% — roughly 1 in 1,000.
Bookmakers actively promote accumulators because the margins compound with each selection. The overround on a single bet might be 5%, but across a 10-fold acca, the combined margin is significantly higher.
How the accumulator calculator works
How to use this calculator
Enter the odds for each of your selections, add your stake, and the calculator shows your potential returns, profit, combined odds, and implied probability. You can add up to 20 selections and switch between fractional, decimal, and American odds formats. For each-way accumulators, check the each-way box and set your place terms.
Accumulator vs single bets
The appeal of accumulators is the multiplied odds. But every selection you add reduces the probability of winning. A single bet at 2/1 has a 33% implied probability. A 4-fold at 2/1 each has an implied probability of just 1.2%. That's why most accumulators lose — and why bookmakers promote them so heavily.
If you want the coverage of multiple selections without the all-or-nothing risk, consider a Lucky 15 or a Yankee — both include singles and smaller combinations that pay out even when not all selections win.
Each way accumulators explained
An each-way accumulator is two bets: a win accumulator and a place accumulator. If all selections win, both parts pay out. If all selections place but some don't win, you still get a return from the place accumulator.
The cost is double — a £5 each way accumulator costs £10 total. But for selections at longer odds, the place accumulator provides meaningful protection.