Accumulator Calculator
Calculate accumulator returns from 2 to 14 selections. Enter your stake and the decimal odds of each leg to see combined odds, potential returns and profit — including any acca boost your bookmaker offers.
Selections (3/14)
Your Results
All legs must win for an accumulator to pay out. Acca boosts are applied to winnings (profit), not to the total returns.
How Accumulator Returns Are Calculated
An accumulator multiplies the decimal odds of every selection into one combined price: returns = stake × odds₁ × odds₂ × … × oddsₙ. A £10 treble at 1.80, 2.10 and 1.65 has combined odds of 6.24, returning £62.37 for £52.37 profit.
The multiplication is what makes accas both attractive and risky: each extra leg raises the potential payout and simultaneously lowers the chance that every leg wins. Bookmakers price this in — the overround compounds with every selection you add, which is why long accumulators are among the most profitable products for the bookmaker.
Acca Boosts
Many UK bookmakers add a percentage boost to accumulator winnings, typically scaling with the number of legs (for example 5% on a 4-fold up to 50%+ on a 14-fold). The boost applies to your profit, not your stake: a £52.37 profit with a 10% boost becomes £57.61. Boost terms vary — minimum odds per leg and maximum extra winnings are common conditions.
Worked Example
£5 five-fold at 1.50, 1.80, 2.00, 1.70, 2.20: combined odds = 1.50 × 1.80 × 2.00 × 1.70 × 2.20 = 20.20. Returns £100.98, profit £95.98. The same five selections as singles would need every bet to win anyway to match it — the acca simply reinvests each win into the next leg automatically.
What an Accumulator Costs, and What It Does Not Change
The section above says the overround compounds. That is true, and on its own it is not a number you can act on. Two identities turn it into one, and they point in opposite directions: the cost of an accumulator rises fast with every leg, while the standard of selection it demands does not move at all.
The take compounds geometrically
Suppose each leg is priced so that a unit staked on it returns 0.95 on average — a 5% take, around the middle of the range for a well-priced football match market. Because the legs multiply, so do the takes: an N-fold returns (1 − 0.05)N per unit staked. The result is not a gentle slope.
| Single | 5.00% of stake |
| Double | 9.75% |
| Treble | 14.26% |
| 4-fold | 18.55% |
| 5-fold | 22.62% |
| 6-fold | 26.49% |
| 8-fold | 33.66% |
A five-fold gives up more than four times what a single gives up. The useful way to hold it: every leg you add multiplies your expected return by 0.95, and it costs that same 5% whether the leg you added is priced at 1.20 or at 12.00. The odds of the extra leg change the shape of the payout, not the price of adding it. How much of any individual price is take in the first place is what the margin calculator measures.
The strike rate you need does not move
Now the identity that runs the other way, and it is the one almost nobody states. Take N legs, each at decimal odds O, each with a real chance p of winning, independent of one another. The acca pays ON and lands with probability pN, so it breaks even when (p × O)N= 1 — which is true exactly when p × O = 1, that is p = 1 ÷ O. The N has cancelled. The per-leg strike rate needed to break even on a fourteen-fold is the same as on a single: 50% at odds of 2.00, 33.3% at 3.00, 20% at 5.00.
An accumulator therefore does not ask you to be a better judge of football than a single does. It asks you to pay the take more times, and it converts a steady outcome into a rare one. Those two things are the whole of the difference, and neither of them is about picking winners.
What a boost has to be worth to matter
Which gives the acca boost above a number instead of an adjective. Take five legs, each offered at 2.00 with that same 5% take, so each has a true chance of 47.5%. The profit boost needed simply to bring the bet back to break-even is 30.2%. At four legs it is 24.3%; at six legs, 36.6%. The requirement climbs with every leg, because the thing it has to cancel climbs with every leg.
Set that against the boost ladder your operator actually publishes, which is the only comparison that matters. A boost well below the figure in this paragraph is not worthless — it genuinely reduces the cost — but it does not turn a compounded take into an even bet, and it is usually offered on the leg counts where the take has grown the most.
Why the combination bets exist at all
One last property, and it is the one that explains the rest of the family. An accumulator is a single line: with five selections it needs all five, and four winners out of five pay exactly nothing. Every other multiple in common use is a way of buying out of that. A Lucky 15 covers all fifteen combinations of four selections and returns something from a single winner; an each-way bet buys a second, easier outcome on the same selection. Same opinions, different exposure, different price. Which of them fits is a question about how you want to be wrong, and the accumulator guide works through the settlement rules behind each.
What these figures assume
Every number above is arithmetic, not a forecast, and it holds only under the stated conditions: legs priced at the same take, results independent of one another, and no correlation between selections. Real accumulators frequently break the last of these — two markets from the same match are not independent, and bookmakers price them accordingly. Take figures vary by market and by operator, and 5% is used here as a round illustration rather than a claim about any book. The break-even identity is exact and does not depend on the take at all.
Frequently Asked Questions
What happens to my accumulator if a match is postponed?
Most bookmakers treat a postponed or void leg as odds of 1.00: the acca stands with one leg fewer. A 5-fold becomes a 4-fold, and the combined odds drop accordingly rather than the whole bet being voided. Read that as the operator settlement term it is, not as the rule of the sport: a league can order an abandoned fixture to count as a completed match on the score when it stopped, and UEFA as a rule plays the remaining time the next day, so the two sources can give different answers about the same fixture.
Who decides, and how long they can take, is set out in our guide to abandoned and postponed match rules.
How many selections should an accumulator have?
There is no magic number, but the maths is unforgiving: five legs each with a 60% chance of winning give the acca roughly a 7.8% chance of landing. Shorter accas at fair prices lose less to the compounding overround than long-shot ten-folds.
Can I do an each-way accumulator?
Yes — an each-way acca is two accumulators in one: a win acca and a place acca at the each-way fraction of each leg. Stake doubles, like any each-way bet. Use the Bet Calculator for each-way maths on a single selection.
Are accumulator odds the same at every bookmaker?
No. Small differences per leg compound: a 2% better price on each of six legs is roughly 12% more combined odds. Compare prices leg by leg — our Odds Converter helps when books quote in different formats.
Does an acca boost cancel out the compounding overround?
Rarely. With five legs priced at 2.00 and a 5% take on each, the accumulator gives up 22.62% of the stake, and the profit boost needed just to bring it back to break-even is 30.2%. At four legs the figure is 24.3% and at six legs 36.6%. A smaller boost still reduces the cost, but it does not make the bet an even one.
Accumulators are high-variance bets: expect long losing runs even with good picks. Set a budget and stick to it. 18+. If gambling stops being fun, see our responsible gambling resources.