Accumulator Bets Explained: Multi Bets, Odds and Bet Builder
An accumulator, called a multi bet at most South African bookmakers, is one bet that combines two or more selections. The odds of each selection are multiplied together, so the potential payout grows quickly — but every selection must win. If one leg loses, the whole bet loses, however many others came in.
What is an accumulator bet?
A single is a bet on one outcome. An accumulator ("acca") strings several outcomes from different events onto one slip with one stake. Two selections make a double, three a treble, and four or more a four-fold, five-fold and so on.
South African bookmakers mostly call it a multi bet. On Betway, for example, you choose the "Multi Bet" option on the bet slip to combine selections. The name differs between sites, but the rules are the same: one stake, odds multiplied, all legs must win.
How the odds multiply
To get the combined odds, multiply the decimal odds of every leg. The table below shows a four-leg multi built from ordinary match-result and goals selections. The odds are illustrations, not tips.
| Leg | Selection type | Odds | Running combined odds |
|---|---|---|---|
| 1 | Home win | 1.50 | 1.50 |
| 2 | Over 1.5 goals | 1.40 | 2.10 |
| 3 | Away win | 2.20 | 4.62 |
| 4 | Both teams to score – yes | 1.80 | 8.32 |
A R10 stake on this multi would return about R83 if all four legs win, against R15 for the first leg alone as a single.
That jump is what makes multis popular. It is also what hides the risk, which is the next section.
Why one leg sinks the slip
Chances multiply in the same way as odds. Suppose each leg in a four-leg multi has roughly a three-in-five chance of winning. The chance that all four win is three-fifths multiplied by itself four times — about one in eight. Add a fifth similar leg and it drops to under one in twelve.
There is a second, quieter effect. Every price a bookmaker offers includes a margin, its built-in edge. In a multi, those margins multiply along with the odds, so the bookmaker's edge on a long accumulator is much bigger than on a single. The bigger the multi, the more you pay for the chance of a large return.
This is why multis with a dozen legs so often lose by one result. Nothing went unusually wrong; the maths simply makes a clean sweep unlikely.
Voids, postponements and draws
If a leg is made void — for example the match is postponed or abandoned under the bookmaker's rules — that leg is normally removed and the multi continues on the rest. Its odds are treated as 1.00, so your potential return drops.
- A four-fold with one void leg becomes a treble.
- If every leg is void, the stake is usually returned.
- Postponement rules vary: some bookmakers keep the bet open for a set period if the match is rescheduled, others void it. Check the sport rules on the site.
A draw is not a void. If you backed a team to win and the match is drawn, that leg has lost and so has the multi — unless the market itself returns stakes on a draw, as draw no bet does.
Bet builder: a multi from one match
A normal multi takes selections from different events. A bet builder (sometimes "same game multi") combines several markets from the same match — for example a team to win, over 2.5 goals and a number of corners.
The key difference is correlation. Outcomes in one match are linked: if a team wins comfortably, over 2.5 goals becomes more likely. A standard multi cannot price that, which is why most bookmakers stop you adding two selections from the same match to an ordinary multi. A bet builder adjusts the combined price for the link, so the odds are usually lower than simply multiplying the separate prices.
Everything else is the same as a multi: one stake, and every part of the builder must happen for the bet to win.
System bets: covering a losing leg
A system bet splits your selections into many smaller combinations. A "Trixie", for example, covers three selections with three doubles and a treble — four bets in total. If one selection loses, the doubles made from the other two can still pay.
The trade-off is cost: a system bet is several bets, so your total stake is the unit stake multiplied by the number of combinations. Where a bookmaker offers system bets, the slip shows the number of bets and the total cost before you confirm.
Acca boosts, insurance and cash out
Some bookmakers add a percentage boost to winning multis with enough legs, or refund the stake as a bonus when one leg lets the slip down. These are promotions with conditions: a minimum number of legs, minimum odds per leg, and a refund paid as bonus funds rather than cash. See our bonuses page for how wagering works, and read the promotion terms before building a slip around it.
Cash out, where offered, lets you settle a multi early for an amount the bookmaker calculates. It is always less than the full return if everything goes on to win, and more than nothing if a leg later fails. Treat it as a choice, not a safety net.
Some SA bookmakers also have early-payout options on football legs; our guide to 1UP and 2UP on Betway explains how a triggered leg is marked as won inside a multi.
How to place a multi bet
- Log in to a licensed bookmaker and open the sport you want.
- Tap the odds for your first selection; it appears on the bet slip.
- Add selections from other matches. On most sites the slip switches to a multi automatically, or you choose the multi option.
- Check the combined odds, the stake and the potential return shown on the slip.
- Confirm the bet. Your multi appears under open or pending bets.
You can also share or load a multi with a booking code instead of adding each leg by hand — see what is a booking code. To compare the bookmakers themselves, use our comparison of licensed betting sites.
FAQ
What is the difference between an accumulator and a multi bet?
There is none. "Accumulator" is the older British term; most South African bookmakers, including Betway and Hollywoodbets, use "multi bet" for the same thing.
What happens if one leg of my multi is postponed?
Usually that leg is voided and the multi continues on the remaining legs at lower combined odds. The exact postponement rule depends on the bookmaker, so check its sport rules.
Can I combine two selections from the same match in a multi?
Not normally, because they are linked. Use a bet builder, which prices related selections from one match together.
How many legs should a multi have?
There is no correct number, but each extra leg lowers the chance of the bet landing and raises the bookmaker's edge. Fewer legs mean a smaller potential return and a better chance of it happening.
Are accumulators a good way to make money?
No. Betting is entertainment with a cost, and long multis lose far more often than they win. Set a budget, and if betting stops being fun, see our responsible gambling page or call the NRGP free on 0800 006 008.
More on this topic: Betting basics.
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