Multi bet calculator: odds, return and chance of winning

Multi bet calculator

Combined odds: -
Return: -
Profit: -
Implied chance all win: -

The implied chance comes from the bookmaker's own prices, which include its margin, so the true chance is a little lower. Every leg must win: one loss and the whole multi loses.

Key facts

A multi combines two or more bets into one; every leg must win for the multi to pay.
Combined odds are the odds of each leg multiplied together: $1.90 x $2.10 x $1.65 = $6.58.
The chance of a multi winning drops fast: three legs at a 50% chance each win together only 12.5% of the time.
The bookmaker's margin is charged on every leg, so it compounds in a multi.

How to use the multi bet calculator

Enter your stake, then the decimal odds of each leg. Add or remove legs with the buttons. The calculator multiplies the odds together and shows the return, the profit and the implied chance that all your legs win.

What a multi bet is

A multi is one bet made of several selections, and it only pays if every selection wins. Punters love them because small stakes can return big money. Bookmakers love them too, because the chance of every leg landing falls much faster than most people expect. A system bet spreads the same picks across every double, treble and bigger multi they can make, and the system bet calculator counts the lines and the outlay. If one leg dead heats, the payout is split; our dead heat rules guide shows how that works in a multi.

How the maths of a multi works

The combined odds are the product of every leg's odds. The implied chance of the multi is the product of every leg's implied chance, which is the same as 100 divided by the combined odds.

Legs	Each leg at $1.90	Combined odds	$10 returns	Implied chance all win
2	$1.90	$3.61	$36.10	27.7%
3	$1.90	$6.86	$68.59	14.6%
4	$1.90	$13.03	$130.32	7.7%
5	$1.90	$24.76	$247.61	4.0%
8	$1.90	$169.84	$1,698.36	0.6%

Each leg at $1.90 implies a 52.6% chance. The bookmaker margin sits inside every leg, so an eight leg multi of these prices carries that margin eight times over.

Multis, the margin and value

A multi is not a value bet by itself. If each leg carries a 5% margin, the margin compounds as legs are added, so long multis quietly charge a lot more than singles. A multi only makes sense when you believe several legs are priced too long. Converting each price with the odds converter helps you compare your own view with the bookmaker's, and the expected value calculator puts a number on the gap.

Pundit tip: if you would not back a leg as a single, ask why it belongs in your multi.

If your multi is one result from paying, the hedge bet calculator works out the stake on the other side that locks in a profit, and what that guarantee costs.

Racing multis and exotics

A racing multi links winners across races. To find several placegetters in one race instead, look at exotics: the quinella calculator and boxed trifecta calculator show what those bets cost. Our bet types guide explains every bet on an Australian betting slip.

Frequently asked questions

What is a multi bet?

A multi is a single bet that links two or more selections, called legs. The odds multiply, so the payout grows quickly, but every leg must win. If one leg loses, the whole multi loses.

How are multi odds calculated?

Multiply the decimal odds of every leg. A three leg multi at $1.90, $2.10 and $1.65 has combined odds of $6.58, so a $10 multi returns $65.84.

What happens if one leg of my multi is scratched or abandoned?

Rules differ by bookmaker, but usually a scratched or void leg is removed and the multi is paid on the remaining legs at their odds. Check your bookmaker's rules for the event and the bet type.

Is a multi better value than single bets?

No, not on its own. A multi pays more because it is far less likely to win, and the bookmaker's margin is built into every leg. A multi made of legs you think are underpriced can be good value; one made of short-priced favourites usually is not.

Is a same game multi the same as a multi?

A same game multi links legs from one match, such as a winner and a player to score. Because those legs are linked, the bookmaker prices the combination itself instead of simply multiplying the odds, so this calculator will not match a same game multi price.