1 bets · 4 selections
Accumulator calculator: acca returns, each way and void legs
An accumulator combines every selection into one bet. The odds multiply together, so the returns build fast — but every single leg has to win, and one loser takes the whole bet down.
How a Accumulator is made up
A Accumulator covers a single combined bet across all your selections. That comes to 1 separate bets, so a £1 Accumulator costs £1.00 rather than £1 — and £2.00 if you place it each way.
| Line type | Number of bets | Share of the bet |
|---|---|---|
| fourfold | 1 | 100.0% |
| Total | 1 | 100% |
A worked Accumulator example
Take a four-fold at 2/1, 6/4, 3/1 and evens, staked at £10.00 a line with every selection winning. The figures below come from the same calculation the tool above runs.
- Unit stake
- £10.00
- Total stake
- £10.00
- Returns
- £600.00
- Profit
- +£590.00
| Selection | Fractional | Decimal |
|---|---|---|
| 1 | 2/1 | 3.00 |
| 2 | 3/2 | 2.50 |
| 3 | 3/1 | 4.00 |
| 4 | 1/1 | 2.00 |
When a Accumulator is the right bet
The accumulator is the simplest multiple and the most brutal. Four selections at 2/1 turn a £10 stake into £810, which is why the bet is so popular, and a single beaten favourite turns the same £10 into nothing, which is why it is so rarely a winner. There is no partial credit.
The maths is straightforward: multiply the decimal odds of every selection together, then multiply by your stake. What is less obvious is how quickly the probability collapses. Four legs each with a 50% chance give you a one-in-sixteen shot; six legs give one in sixty-four. The returns grow, but the strike rate falls faster than most people expect.
Where an accumulator does make sense is as a deliberate low-stake, high-variance bet, or when you genuinely believe the individual prices are generous. What it should not be is a way of turning several selections you are lukewarm about into one bet you can afford. If two of your legs are there to make up the numbers, they are quietly costing you the whole bet.
There is a less visible cost too. Bookmaker margin is built into every price, and on an accumulator it compounds along with the odds. A three percent margin on each of five legs is not three percent on the accumulator — it works out closer to sixteen percent. That is the real reason long accumulators are poor value, and it is invisible on the betting slip because the displayed return still looks generous.
Void legs are handled the same way as in any multiple. A withdrawn selection settles at odds of 1.00, so a fivefold with one non-runner simply becomes a fourfold on the remaining selections rather than losing. Rule 4 deductions and dead heats also flow through, and the calculator applies both per selection.
What it does well
- Very large returns from a small stake
- Simple to understand and to check
- Non-runners reduce the bet rather than losing it
What it costs you
- One losing leg loses the entire bet
- Strike rate falls faster than returns rise
- Tempting to pad with selections you do not rate
Accumulator questions
How do you work out accumulator returns?
Multiply the decimal odds of every selection together, then multiply the result by your stake. Four selections at 3.0, 2.5, 4.0 and 2.0 give a combined 60.0, so a £10 stake returns £600.
What happens if one leg of an accumulator is a non-runner?
That selection is settled at odds of 1.00, so it drops out without losing the bet. A fivefold with one non-runner is paid as a fourfold on the remaining selections.
How many selections can an accumulator have?
Four or more is the usual definition — a fourfold, fivefold and so on. Two selections is a double and three is a treble. This calculator handles four to eight.
Is an each way accumulator worth it?
It doubles the stake and settles a separate place accumulator, which needs every selection to place. That is more achievable than every selection winning, but the place odds are a fraction of the win odds, so the returns are far smaller. Run both halves through the calculator before deciding.
Why do accumulators so rarely win?
Because probabilities multiply. Four legs at even money each is a one-in-sixteen chance; six legs is one in sixty-four. The bookmaker margin also compounds with every leg you add, which is the less visible reason long accas are poor value.