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Mechanics · Australia
What a multi actually pays, and what quietly changes it
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18+. Welcome-bonus eligibility, qualifying deposit, wagering, expiry and withdrawal conditions are set by the operator. Check the current promotion terms before playing.
Adding a leg multiplies the price and multiplies the margin working against you. Three, four and five legs are not three versions of the same bet — the expected cost of each additional leg is calculable, and so is the point at which the payout cap takes over.
Quick answer
A multi's price is the decimal prices of its legs multiplied together, and the return is that product times the stake — until a maximum payout cuts it. A void leg does not void the multi: it is removed and the bet re-prices on the remaining legs. Duplicating a slip copies the selections, not the prices. And each additional leg compounds the operator's margin: on legs priced at a 5% margin, a four-leg multi carries about an 18.5% expected cost against about 5% on a single.
How the price is built, with worked 3, 4 and 5-leg examples
Multiplication, nothing more. Take three legs at decimal 2.00, 1.90 and 2.40. The multi price is 2.00 × 1.90 × 2.40 = 9.12, so a A$20 stake projects a return of A$182.40 including the stake.
Add a fourth leg at 1.75 and the price becomes 9.12 × 1.75 = 15.96, projecting A$319.20 on the same A$20. Add a fifth at 2.20 and the price becomes 15.96 × 2.20 = 35.11, projecting A$702.24. The jump from four legs to five added A$383 of projected return for no extra stake, which is exactly why the product is sold the way it is.
One mechanical note: the betslip rounds the displayed price while the operator may calculate on the unrounded product, so a projected return can differ by cents from the figure you compute by hand. That is rounding, not an error.
Why the margin compounds, and why multis are the most profitable product sold
Every price carries the operator's margin. Take a two-outcome market where the true chance of each side is genuinely even. A fair decimal price would be 2.00. Offered at 1.90, the implied probability of each side is 1 ÷ 1.90 = 0.5263, so the two sides sum to 1.0526 — an overround of 5.26%, which corresponds to a margin of 5% on turnover. For a single bet, that means an expected return of A$0.95 per A$1 staked.
Multis multiply those expectations as well as those prices. Two such legs return 0.95 × 0.95 = 0.9025 per dollar, a 9.75% expected cost. Four legs: 0.95⁴ = 0.8145, an 18.55% expected cost. Five legs: 0.95⁵ = 0.7738, a 22.62% expected cost. Nothing about the legs has changed — the operator has not widened its margin — and yet the expected cost of the bet has more than quadrupled between one leg and five.
| 1 leg | Returns 0.950 per A$1 — expected cost 5.00% |
|---|---|
| 3 legs | Returns 0.857 per A$1 — expected cost 14.26% |
| 4 legs | Returns 0.815 per A$1 — expected cost 18.55% |
| 5 legs | Returns 0.774 per A$1 — expected cost 22.62% |
This is the single most useful fact about multis and it is almost never stated on a betting site: the reason multis are promoted harder than singles is that the compounding margin makes them the most profitable product on the shelf. That is not an argument that you should never place one — a multi buys a large return for a small stake, and people buy it for the same reason they buy a lottery ticket — but it is an argument for knowing the price of the entertainment.
A void leg does not void the multi: it re-prices
When a leg is voided — an abandoned match, a withdrawn runner, a market settled as no-result under the operator's rules — the standard treatment is to remove that leg and settle the multi on the remaining ones at the product of their prices. A five-leg multi with one void leg becomes a four-leg multi. Your stake stays as it was, so the projected return falls by the price of the removed leg.
Worked through the example above: the five-leg multi at 35.11 with the 2.20 leg voided re-prices to 15.96, and the A$20 stake now projects A$319.20 instead of A$702.24. Nothing has been taken from you; the bet you are left holding is simply a different, shorter one. The case that does cause genuine disputes is a sport-specific no-result rule — tennis retirements, a cancelled race meeting, a match abandoned after a certain point — because whether a leg is void or settled as a loss is decided by the sport's rules in the operator's terms, not by a general principle. Those rules are worth reading once for the sports you actually bet.
Related legs, and when a same-game product is the only option
Two selections from the same event are usually correlated, and a conventional multi assumes independence. Operators therefore refuse related legs in a standard multi and route them into a same-game product that prices the correlation. That is why a betslip can reject a combination without telling you why, and why the same two selections are accepted inside a same-game builder at a shorter combined price than you would get by multiplying.
The shorter price is not an operator taking something from you — it is the honest price of a correlated pair, because the two outcomes are more likely to occur together than independence implies. Our guide to same-game multis covers how those are built and where the pricing gets opaque.
The payout cap: where the arithmetic stops being true
A multi is the bet most likely to meet a maximum payout, because compounding prices get large quickly. If the operator's cap on that market class is A$1,000 and your five-leg multi projects A$702, you are under it. Add a sixth leg at 2.20 and the projection goes to roughly A$1,545 — and the return, if it lands, is A$1,000.
That matters for how you build the bet, not just for how you read the result. If the projection is above the cap, every additional leg is buying nothing: you are taking on more ways to lose in exchange for a return you will not be paid. The cap lives in the general rules rather than on the betslip, usually with a schedule by sport and market class, and it is frequently lower for multis and exotics than for a straight head-to-head. Our guide to betting limits and caps in Australia sets out all four limits and where each is written down.
At stakes where the cap binds on ordinary bets rather than only on long multis, the comparison between operators becomes service and ceilings rather than promotions — on the casino side that is what the high-roller offer we list is built around, and its withdrawal caps are the number to read first.
Duplicating a slip copies legs, not prices
The duplicate function exists to save typing, and that is all it does. It copies the selections into a new slip and then prices them at the market as it stands now. If a leg has moved since the original bet — and in a live or pre-match market it has — the duplicate is a different bet at a different price. If a leg has been suspended, the duplicate may not be placeable at all.
So read the new slip before confirming, and read the price rather than the selections. The specific trap is duplicating a winning-looking slip late in the day: the price has shortened precisely because the market agrees with you, and the duplicate therefore buys less return for the same stake.
A failed placement versus a slow confirmation
If the app hangs on confirmation, do not tap again. Open your open bets or pending bets list and check whether the multi is there. The two states look identical on a stalled screen and have opposite correct responses: a failed placement needs re-submitting, while a slow confirmation that you re-submit gives you two multis at two prices and double the stake at risk.
This is the same discipline that applies to a stalled deposit or a stalled withdrawal, and for the same reason: the system's record, not the screen, is the source of truth. Our page on the bet slip covers the states it can be in, and what to do when the app is not responding covers the connectivity side.
Cash out on a multi, and why the quote is usually unavailable
A cash-out quote requires the operator to price every remaining leg live and simultaneously. If any one of them is suspended — a goal under review, a break in play, a market pulled before a race — there is no quote, and the whole multi is unavailable to cash out until every leg is priceable again. That is why cash out on a five-leg multi disappears so much more often than on a single.
When a quote is available, it is the operator's offer to buy the bet back, and it carries its own margin on top of the margin already in the legs. Taking it is a decision, not a safety feature. Our page on how cash out is priced goes through what the quote contains.
3 versus 4 versus 5 legs: what each additional leg actually costs
Put the two effects side by side and the choice becomes concrete. Each leg multiplies the projected return, which is the reason people add them. Each leg also multiplies the expected cost — from about 14.3% at three legs to 18.6% at four and 22.6% at five, on 5%-margin legs — and multiplies the number of ways the bet can fail. And beyond a certain projected return, the payout cap means the extra legs buy nothing at all.
The practical rule that follows: decide the projected return you are buying before you build the slip, check it against the cap, and stop adding legs once you reach it. Adding a leg because the projection looks better is the one decision on this page that is reliably against you.
Frequently asked questions
What happens to my multi if one leg is void?
The leg is removed and the multi settles on the remaining legs at the product of their prices. The stake is unchanged, so the projected return falls. Whether a particular event is void or a loss is set by the sport-specific rules in the operator's terms.
Why won't the app let me combine two selections from the same match?
They are related legs. A standard multi prices legs as independent, so correlated selections are routed into a same-game product that prices the correlation — usually at a shorter combined price.
Does duplicating a bet slip keep my original prices?
No. It copies the selections and prices them at the current market. Read the new slip's price before you confirm.
Why is cash out unavailable on my multi?
Because at least one leg cannot be priced right now. Cash out requires a live price on every remaining leg simultaneously, which is why it drops out far more often on a multi than on a single.
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