A parlay (also called an accumulator or combo bet) links two or more individual wagers, called legs, into a single bet. The appeal is obvious: a small stake can return a big payout. The catch is equally simple: if any single leg loses, the entire parlay loses. That all-or-nothing structure is what makes parlays exciting and, for most bettors, unprofitable over the long run.
How Parlay Odds Are Calculated
The math is cleaner than it looks. Convert each leg to decimal odds, multiply them together, and you have the parlay's decimal price. A standard -110 leg equals 1.909 in decimal.
- Two -110 legs: 1.909 x 1.909 = 3.645, which is about +264 in American odds.
- Three -110 legs: 1.909 x 1.909 x 1.909 = 6.96, about +596.
- Four -110 legs: 1.909 to the fourth power = 13.28, about +1228.
A $10 four-leg parlay at those prices returns roughly $132.80. Enticing, but notice how the vig compounds. Each -110 leg carries that 4.76% margin, and multiplying the legs multiplies the house edge too.
Payout Table
Here is what a typical parlay of even-money-ish (-110) legs pays, alongside the true probability of hitting it if each leg were a genuine 50/50.
| Legs | Approx. American Odds | Payout on $10 | True 50/50 Chance |
|---|---|---|---|
| 2 | +264 | $36.40 | 25.0% |
| 3 | +596 | $69.60 | 12.5% |
| 4 | +1228 | $132.80 | 6.25% |
| 5 | +2436 | $253.60 | 3.13% |
| 6 | +4661 | $476.10 | 1.56% |
The gap between the payout and the fair payout at each step is the house's edge. A true fair payout on a 6.25% event would be +1500, not +1228, which is why casual parlay bettors lose faster than straight bettors. If you need a refresher on converting these prices, see our odds explained guide.
How the house edge compounds
Here is the intuition behind that gap. A single -110 bet carries roughly a 4.76% margin against you. When you parlay, you are effectively paying that margin on every leg and then multiplying the results. The expected value of the whole ticket is the product of each leg's expected value, so the more legs you stack, the more the edge stacks with them. A two-leg parlay of -110 sides gives the house about a 9.3% theoretical hold, and by five or six legs the hold on the ticket climbs well past 20%. This is the single most important thing to understand about parlays: the excitement of a big number comes at the cost of a much steeper edge than you would ever accept on a straight bet.
Correlated Parlays
A correlated parlay is one where the outcome of one leg makes another leg more likely. The classic example: betting a team's moneyline and the game going over the total, on the theory that a high-scoring shootout helps a favorite win. Or a quarterback going over his passing yards prop combined with his team's team-total over.
Correlation is valuable because the sportsbook prices each leg as if it were independent, so genuine correlation gives you a hidden edge. For that reason, most books either block obviously correlated combinations or reprice them through a same-game parlay (SGP) engine that adjusts the odds down to account for the correlation. When a book lets a correlated combo slip through at standard odds, that is a rare pocket of value.
When Parlays Actually Make Sense
- Small stake, big-upside entertainment. If you accept the lower expected return and treat it as a lottery ticket, a small parlay is fine fun.
- Genuine correlation. When you have identified a legitimate correlated angle the book has not fully priced.
- Beating specific promos. Parlay insurance or profit-boost tokens can shift the math in your favor for a single ticket.
When do they not make sense? As your default bet. Stringing together three sides you sort of like just to chase a bigger number is how bankrolls disappear. Sharp bettors overwhelmingly favor straight bets because each one carries less compounded vig. A useful discipline is to ask, for every leg you add, whether you would actually place that bet on its own. If the answer is no, it does not belong on the ticket, and you are only adding it to inflate the payout, which is precisely the psychology the sportsbook is counting on.
Round robins and teasers
Two parlay cousins are worth a mention. A round robin breaks a group of selections into every possible smaller parlay combination, spreading your risk so that one losing leg does not necessarily kill the whole slate. A teaser, common in football and basketball, lets you move the spread or total a set number of points in your favor across every leg in exchange for a lower payout, which can be powerful when the adjustment crosses key numbers like 3 and 7 in the NFL. Both are still multi-leg bets with a built-in margin, so the same discipline applies.
Parlays in New York
Every one of New York's nine licensed mobile sportsbooks offers parlays and same-game parlays, and so do the offshore books we review, such as BetOnline and SportsBetting.ag, which also accept New York players. The offshore SGP menus are sometimes looser, but you trade away the consumer protections of a state-regulated operator. Whichever you choose, treat parlays as the high-variance product they are, and lean on our responsible gambling tools if the chase ever stops being fun.