Accumulator bets: how to work out the odds, the chance of winning and whether an acca pays
The odds of an accumulator (acca) are the product of the odds of all its legs, and the chance of it landing is the product of their chances, which is why an acca of five "bankers" at 70–80% lands only about one time in four. In our data, random accas of five such favourites landed 24.1% of the time. The bookmaker's margin multiplies along with the odds, so the more legs you add, the bigger the share of your stake you hand over on average. An acca can be fun, with a big potential win, but in the long run it pays less than single bets.
Key takeaways
- 1
The odds of an accumulator are the product of the odds of its legs, and the payout is stake × acca odds, so £20 on 1.80, 2.00 and 2.20 pays £158.40.
- 2
An acca of 2 favourites at 70–80% landed 56.7% of the time, and one of 10 favourites only 5.9%.
- 3
At a 5% margin per leg, a five-leg acca leaves you £78.35 of every £100 on average, against £95.24 for a single bet.
- 4
A +10% bonus on the payout lifts the five-leg acca only to £86.19 of every £100, so you still lose.
- 5
A full hedge before the last match locks in a profit of about £57 whatever happens, but in our example it costs about £7 of expected result.
How to work out acca odds and the payout
An accumulator (in the US a parlay) wins only if every leg on it wins. The combined odds are the product of the odds:
acca odds = odds₁ × odds₂ × … × oddsₙ
payout = stake × acca odds
As with any decimal odds, the payout includes your stake.
A step-by-step example: three legs at odds of 1.80, 2.00 and 2.20, a £20 stake.
- Acca odds: 1.80 × 2.00 × 2.20 = 7.92.
- Payout: £20 × 7.92 = £158.40.
- Profit: 158.40 − 20 = £138.40.
The chance of winning: a product that surprises
The probability that every leg wins is the product of their chances (assuming the matches are independent of each other), and you can read each chance from the odds. This is where intuition fails most, because "sure" picks stop being sure once you combine them.
Take the five biggest favourites of the weekend of 9–11 October 2026. With the margin removed, the market priced them like this:
| Match | Pick | Chance | Fair odds | Odds with a 5% margin |
|---|---|---|---|---|
| Barcelona – Getafe | 1 | 92% | 1.09 | 1.04 |
| Paris SG – Le Mans | 1 | 90% | 1.11 | 1.06 |
| Inter – Parma | 1 | 85% | 1.18 | 1.12 |
| Augsburg – Bayern | 2 | 80% | 1.25 | 1.19 |
| Real Madrid – Villarreal | 1 | 73% | 1.37 | 1.30 |
| Accumulator | 41.1% | 2.43 | 1.91 |
- Chance of the acca: 0.92 × 0.90 × 0.85 × 0.80 × 0.73 = 0.411. Every pick on its own looks safe, yet the acca loses more often than it wins.
- Fair odds of the acca: 1 / 0.411 = 2.43.
- The bookmaker's odds with a 5% margin on every leg: 2.43 / 1.05⁵ ≈ 1.91.
- Payout from £100: 100 × 1.91 ≈ £191.
- Expected value: 0.411 × £190.63 − £100 ≈ −£22 for every £100 staked on such an acca.
The current chances of upcoming matches, from which you can work out the chance of your own acca, are on our list of football tips.
What our data says
We checked this on real results. From matches of the 2023–2026 seasons we drew accas of favourites to whom the closing odds gave a 70–80% chance (200,000 draws):
| Legs on the slip | Slip landed | Implied by the odds | Estimated result per £100* |
|---|---|---|---|
| 2 | 56.7% | 55.1% | −£7 |
| 3 | 42.5% | 40.9% | −£10 |
| 5 | 24.1% | 22.5% | −£16 |
| 8 | 10.3% | 9.2% | −£24 |
| 10 | 5.9% | 5.1% | −£28 |
* An estimate at average fair odds of 1.35 per leg (a 74.2% chance), a 5% margin on every leg and the hit rate in the "Slip landed" column.
Two things matter here. First, the hit rate falls very fast: ten "bankers" land less than 6% of the time. Second, in this sample the favourites won slightly more often than the odds implied (75.5% rather than 74.2%), but that small edge stands no chance against the margin. Even with it, an acca of five favourites loses about £16 of every £100 on average, and one of ten more than a quarter of the stake. Keep that in mind when a paid group offers "sure" accas of bankers: it is one of the most common tipster scams.
The margin multiplies
Every leg on the slip carries the bookmaker's margin. When the odds multiply, so do the margins: 5% on one leg is 1.05, on five legs 1.05⁵ = 1.276, on ten 1.629.
| Legs | Combined margin | Left of every £100 of value |
|---|---|---|
| 1 | 1.050 | £95.24 |
| 3 | 1.158 | £86.38 |
| 5 | 1.276 | £78.35 |
| 8 | 1.477 | £67.68 |
| 10 | 1.629 | £61.39 |
Each extra leg puts its margin on top of all the margins before it, so the cost grows faster than the odds suggest. A single gives away less than £5 of every £100 at this margin, and a ten-leg acca almost two-fifths. How the margin is built into the odds of one market is explained in how bookmakers make money.
How many legs should an acca have?
Mathematically, the fewer the better. Every extra leg lowers the chance of winning and adds margin. If you enjoy accas for the thrill, sensible rules are simple:
- 2–3 legs rather than 8–10,
- a fixed, low stake per slip, set in advance,
- no legs "added on" just to push the odds up,
- no selections from the same match on a regular acca: the bookmaker will usually block the combination, and picks from one match have their own product, the bet builder, which prices the links between them.
Long accas look great in screenshots, but slips that "nearly came in" because one leg in ten let you down are a classic source of illusions. We write about this in our piece on betting psychology.
A system instead of an acca
A system is several accumulators built from the same selections. The simplest, a 2 from 3 system, is three doubles: A+B, A+C and B+C. You win something even if one leg loses. Add the treble to those three doubles and you have what British bookmakers call a Trixie.
Example: the same odds of 1.80, 2.00 and 2.20, three doubles at £10 each (£30 in total).
| What won | Payout | Result |
|---|---|---|
| all three | 36.00 + 39.60 + 44.00 = £119.60 | +£89.60 |
| only A and B | £36.00 | +£6.00 |
| only A and C | £39.60 | +£9.60 |
| only B and C | £44.00 | +£14.00 |
| one or none | £0 | −£30 |
At these odds any two winners are enough for a small profit. For comparison, one £30 acca on all three legs would pay £237.60, but nothing at all after one miss. A system lowers the variance but does not remove the margin, because each of the three doubles carries it. How many combinations bigger systems have, how they pay compared with accas and singles, and what a £10 weekly acca costs over 10 years, we show in our piece on system bets.
A void leg on the slip
If a match is postponed or called off and the bookmaker voids the bet (time limits and examples in our piece on postponed and abandoned matches), that leg usually counts at odds of 1.00 and the rest of the slip plays on. A 1.80 × 2.00 × 2.20 = 7.92 slip with the third match void has odds of 1.80 × 2.00 = 3.60, and the payout from £20 drops from £158.40 to £72.00. In tennis a leg can also be voided by a retirement or a walkover, depending on the bookmaker's rules. The details, including typical time limits for postponed matches, are in our guide to bet settlement rules.
How to hedge an acca before the last match
Hedging means betting on the opposite result in the last match still to play, sized so that you make money whatever the outcome.
An illustrative example on matches from the weekend of 9–11 October 2026. A £50 slip with four legs:
| Match | Pick | Odds (illustrative) |
|---|---|---|
| Dortmund – Werder (9 Oct) | 1 | 1.34 |
| Real Madrid – Villarreal (10 Oct) | 1 | 1.30 |
| Arsenal – Leeds (10 Oct) | 1 | 1.40 |
| Crystal Palace – Nottingham Forest (11 Oct) | 1 | 1.98 |
Acca odds: 1.34 × 1.30 × 1.40 × 1.98 = 4.829. Payout: 50 × 4.829 = £241.44. Before the weekend the chance of all four winning was about 16.6%.
Suppose the first three have won and Crystal Palace – Nottingham Forest is left on Sunday. The slip wins if Palace win (say a 47.2% chance) and loses on a draw or a Forest win. One bet covers both of those results: double chance X2. Let's say X2 is priced at 1.80.
Full hedge: you look for the stake H on X2 that gives the same result in both scenarios.
- Palace win: 241.44 − 50 − H
- draw or Forest win: 1.80 × H − H − 50
From 241.44 − H = 1.80 × H − H you get H = 241.44 / 1.80 = £134.13.
| Scenario | Slip pays | X2 pays | Total staked | Result |
|---|---|---|---|---|
| Palace win | £241.44 | £0 | £184.13 | +£57.31 |
| draw or Forest win | £0 | £241.43 | £184.13 | +£57.30 |
Total staked is £50 on the slip and £134.13 on X2. The penny of difference comes from rounding the stake. Rounded to a whole £134, the result is +£57.44 or +£57.20.
Partial hedge: if you only want your £50 stake back, you put H = 50 / (1.80 − 1) = £62.50 on X2. On a draw or a Forest win you break even, and if Palace win you are up £128.94.
Is it worth it? A hedge is not free. At those chances (52.8% for a draw or a Forest win), X2 at 1.80 has an expected value of about −5% of the stake, so the full hedge lowers the expected result from +£63.96 (no hedge) to +£57.31. You pay about £7 for certainty, roughly a tenth of the expected profit: cheap insurance, but not free. It makes sense when the potential win is large compared with your budget, not as a habit. You can work out the hedge stake in the hedge calculator: load the Acca: last leg example, which is this slip, or choose Accumulator, mark the first three legs Won and the Palace match To play, and enter X2 at 1.80. The calculator shows the Equal profit and Stake back hedges and the Cost of certainty, and when several legs are still to play it plans a Leg-by-leg hedge.
Cash-out: the bookmaker's version of a hedge
Cash-out is the bookmaker's offer to pay you part of the winnings before the slip is settled. It works like a built-in hedge, except that the bookmaker sets the price. In the example above, the "fair" value of the slip before the Palace match is 0.472 × £241.44 ≈ £114. A cash-out offer is usually lower, because it carries a margin. Compare it with what a hedge of your own would give: X2 at 1.80 locks in +£57.31, the same as a cash-out of £107.31 (the £50 stake plus £57.31). An offer below that is worse than hedging at these odds, and one above it is better, so the difference can go either way. The hedge calculator compares the two once you enter the offer. Remember, too, that cash-out is not guaranteed: the bookmaker can suspend it, for example during a dangerous attack in the match.
Accumulator promotions
Bookmakers like to promote long slips: a percentage bonus on the payout for 5+ legs, often sold as an acca boost, or acca insurance, which refunds the stake when one leg lets you down. That is no accident. A five-leg acca at a 5% margin per leg leaves you £78.35 of every £100 of value on average. A +10% bonus on the payout lifts that to £86.19, so you still lose. Many boosts go on the winnings only, not on the whole payout, and are worth less still. To break even, such an acca would need a bonus of about +28%. If acca insurance pays you back in free bets, what those are really worth is worked out in our piece on free bets.
Summary
- Acca odds are the product of the odds, and payout = stake × acca odds.
- The chance of landing is the product of the chances: the five big favourites of the weekend of 9–11 October 2026 had only a 41% chance of all winning.
- In our data 5 favourites at 70–80% landed together 24.1% of the time, and 10 of them 5.9%.
- The margin multiplies with every leg: with 5 legs at 5%, on average 78% of the stake's value is left.
- Hedging an acca locks in a profit, but it costs part of the expected value.
Bet on accas with amounts you treat as the cost of entertainment. How to set a budget and limits before your first slip is covered in our 10 bankroll rules.
FAQ
Multiply the odds of every leg on the slip. Three legs at 1.80, 2.00 and 2.20 give odds of 7.92, so a £20 stake pays £158.40, stake included.
As few as possible, ideally 2–3. Every leg lowers the chance of winning and adds the bookmaker's margin. In our data an acca of 2 favourites at 70–80% landed 56.7% of the time, one of 5 favourites 24.1% and one of 10 favourites 5.9%.
Not in the long run, because the margin multiplies with every leg. At a 5% margin per leg, a five-leg acca leaves you £78.35 of every £100 staked on average, and a single bet £95.24. An acca can make sense as entertainment for a small, fixed amount.
Rarely enough to beat the margin. A +10% bonus on the payout lifts a five-leg acca at a 5% margin per leg from £78.35 to £86.19 of every £100 staked, which is still a loss. To break even it would take a bonus of about +28%.
Usually the void leg counts at odds of 1.00 and the slip plays on with the other legs. A 7.92 slip with its 2.20 leg void has odds of 3.60. Check the exact rules and time limits in your bookmaker's terms.
Back the opposite result of the last match, for example double chance X2 when your slip has the home win. Size the stake so the result is the same in both scenarios: with a £241.44 payout and X2 at 1.80 that is £134.13, which leaves about +£57.30 whatever the result. A hedge does lower the expected profit, though, by about £7 in that example. The hedge calculator works out the stake and its cost.
A 2 from 3 system is three doubles from the three selections you pick. You win when at least two legs win, but each double has its own stake. It lowers the risk of losing everything, at the cost of a smaller payout when all three win.