Parlay Calculator: Odds and Payout for 2 to 15 Legs

How to use the parlay calculator

Choose the odds format, then type the odds of each leg. One format applies to every leg: American (-110, +150), decimal (1.91) or fractional (10/11). Three rows show at first. “Add a leg” adds another, up to 15, and the x beside a row removes it, down to two. Then type the stake, which starts at $100.

The result appears once two legs hold a valid price. An empty row is ignored, and “Legs counted” shows how many legs are in the figure. With -110, -110 and +150 as the legs and a $50 stake, the calculator shows a total payout of $455.58, a profit of $405.58, an implied chance of 11%, American odds of +811 and decimal odds of 9.11.

How parlay odds are calculated

A parlay’s price is the decimal odds of its legs multiplied together. So each leg is turned into decimal odds first: a minus price is 100 divided by the number, plus 1, and a plus price is the number divided by 100, plus 1.

Step	Leg 1	Leg 2	Leg 3
American odds	-110	-110	+150
Decimal odds	1.909	1.909	2.500

Multiply the three and the parlay’s decimal odds are 9.1116. The payout is the stake times that figure: $50 x 9.1116 = $455.58, which is $405.58 of profit. To write the price in American odds, take 1 off the decimal and multiply by 100, which gives +811.

The calculator multiplies the full decimals, 1.90909 and so on. Multiply the rounded 1.909 by hand and you get 9.1107, a payout of $455.54, four cents short. A two-leg parlay at -110 and -110 works the same way: its decimal odds are 3.6446, so $100 pays $364.46, a price of +264.

What the combined price hides

The implied chance the calculator shows is 100 divided by the parlay’s decimal odds, so 100 / 9.1116 = 11% in the example. That is the rate at which the parlay breaks even. It is higher than the real chance that all three legs win, because each leg’s price holds the book’s margin, and multiplying the legs multiplies the margins.

The table shows it with legs priced -110 that each win half the time, with no link between them. A fair price for a coin flip pays $200 on $100. At -110 it pays $190.91, so the bettor gets back $95.45 of every $100 staked, on average. Each added leg multiplies by 0.9545 again.

Legs at -110	Parlay odds	Pays on $100	Fair payout on $100	Chance all win	Average result per $100
1	-110	$190.91	$200	50%	-$4.55
2	+264	$364.46	$400	25%	-$8.88
3	+596	$695.79	$800	12.5%	-$13.03
4	+1228	$1,328.33	$1,600	6.25%	-$16.98

The payout grows with every leg, and so does the share the book keeps: $4.55 of each $100 on a single bet, $16.98 on four legs. Our guide to what a parlay bet is carries the table on to six legs.

What this calculator does not do

It treats the legs as separate events and multiplies them. A same game parlay is priced by the book itself, with the link between the legs taken into account, so the book’s price for three legs from one game can differ from the 9.11 that straight multiplication gives in the example.

It does not settle a bet. If a leg is voided, remove its row and the calculator prices the legs that are left: take the +150 leg out of the example and the two -110 legs make +264, so the $50 stake pays $182.23. Whether your book settles a void or a push that way is in its house rules.

It does not price teasers, and it does not build round robins, though each small parlay inside a round robin can be entered here one at a time. See what a teaser bet is and how a round robin works. For one bet with no legs, use the odds calculator.

It does not say how often a parlay wins. The 11% in the example is the break-even rate at that price, and the chance the three legs all win is a judgment about the games. Our guide to EV betting shows how that judgment and the price combine into an expected value.