A slip with four or five matches and a headline return of 20,000 BDT is one of the most attractive things on a betting site. It is also one of the most expensive. This guide shows exactly how the numbers work, so you can decide with open eyes whether the extra excitement is worth the price.
What an accumulator is
An accumulator, also called a parlay or a multiple, is a single bet built from several selections. Every selection must win for the bet to pay. If you want the combined odds, multiply the decimal odds of all selections together. Three selections at 1.50, 2.00 and 1.80 give 1.50 × 2.00 × 1.80 = 5.40. A stake of 500 BDT would return 2,700 BDT, but one wrong leg returns nothing at all.
The price of each extra leg
To keep the maths clean, assume every leg is a two-way market priced 1.90 on both sides, which means each side truly has a 50% chance and the bookmaker keeps a margin of about 5% on each bet. The table uses a stake of 200 BDT.
| Legs | Combined odds | Return if all win | Chance the price implies | Real chance (50% per leg) |
|---|---|---|---|---|
| 1 | 1.90 | 380 BDT | 52.6% | 50% |
| 2 | 3.61 | 722 BDT | 27.7% | 25% |
| 4 | 13.03 | 2,606 BDT | 7.7% | 6.25% |
| 8 | 169.84 | 33,967 BDT | 0.59% | 0.39% |
Look at the last row. A return of almost 34,000 BDT from a 200 BDT stake is vivid, but the real chance of getting it is about one in 256. The price implies one in 170, so you are paid less than the risk deserves.
How the margin compounds
On a single bet at 1.90, you keep 95 taka of expected value for every 100 staked. In an accumulator that 95% is multiplied once for each leg:
- 2 legs: 0.95 × 0.95 = 90.25%, an expected loss of 9.75 BDT per 100 staked.
- 4 legs: about 81.45%, an expected loss of 18.55 BDT per 100.
- 8 legs: about 66.34%, an expected loss of 33.66 BDT per 100.
So the cost of the bet grows with every extra leg, from 5 BDT per 100 on a single to nearly 34 BDT per 100 on eight legs. The bookmaker does nothing special to achieve this. It is arithmetic.
One wrong leg ends everything
Strong favourites do not fix the problem. Suppose each of eight selections is 80% likely, which sounds very safe. The chance that all eight win is 0.8 multiplied by itself eight times, about 16.8%. With four such legs it is 41%. Now try a realistic slip: four favourites priced 1.40, 1.55, 1.30 and 1.65. Combined odds are 4.65, so 500 BDT returns about 2,327 BDT, and the price implies a 21.5% chance. A single upset, a rain delay or a surprise lineup is enough to lose all 500 BDT.
Rules for what happens to a leg that is postponed, abandoned or void differ between markets and sites. Read the market rules before you build the slip, not after a match is interrupted.
When singles are the calmer choice
Take the same 200 BDT and spread it as eight singles of 25 BDT, all at 1.90. On average you lose 5% of the money, about 10 BDT. The single eight-leg accumulator loses on average 33.66%, about 67 BDT. The singles let you win some of the time and keep playing, while the accumulator gives you one long wait and, most of the time, a loss. If your goal is to enjoy several matches, singles last longer for the same budget.
If you still want to build one
- Keep it to two or three legs, and treat every leg beyond that as a lottery ticket.
- Use a stake you have already decided you can lose, as described in staking and budgets.
- Do not add legs just to push the return up after the slip looks too small.
- Some bonuses only count bets with several selections. If you are using one, check the bonus terms for the minimum number of selections and the minimum odds before you build the slip. See the bonus checklist.
Keep reading
- Live betting explained: fast prices, slow screens
- Bonus checklist: ten questions before you say yes
- How crash games work: multipliers, RTP and the predictor myth