A parlay, accumulator (or acca), combo bet, or multi is a single bet that links together two or more individual wagers, usually seen in sports betting. Winning the parlay is dependent on all of those wagers winning together. If any of the bets in the parlay lose, the entire parlay loses. If any of the plays in the parlay ties, or "pushes", the parlay reverts to a lower number of wagers with the payout odds reducing accordingly. Parlay bets are high-risk, high-reward; linking the possibilities drastically reduces the chance of the bet paying off overall. The benefit of the parlay is that there are much higher pay-offs, although as usual, casinos and bookkeepers offering parlays often exploit the poor calculation of gamblers by not increasing the pay-out as much as the odds truly demand, with the effect of the house edge increasing in parlays.

Although a variety of bets can be used to build a parlay bet, correlated parlays are usually not allowed by traditional bookmakers. Correlated parlays are two or more bets from the same game that rely on a closely related outcome: for example, betting that a football (soccer) team might both score more than three goals in a match, and also win the match. These are not independent events, as a team that scores more than three goals is also very likely to win the match. A naive application of odds that treated these events as uncorrelated would not accurately reflect the probability of the linked bet.[1] However, with the rise of sports betting over mobile gambling apps in the late 2010s2020s, this traditional hesitance has weakened. These newer apps often allow "microbets" on propositions such as if the current possession will end in a score, and further allow these props to be bundled into parlays. The system then attempts to compensate on how correlated these props are. While these systems usually prefer to lean heavily in the house's favor, the increased volatility from these bundles has resulted in some notable cases where bettors have found favorable odds. This isn't always a windfall for the bettors, though, as these newer-style sportsbooks have sometimes simply refused to pay out in those cases if the parlay comes through.[2]

Odds and payout

Parlay bets are paid out at odds higher than the typical single game bet, but still below the "true" odds. For instance, a common two-team NFL parlay based entirely on the spread generally has a payout of 2.64:1. In reality, however, if one assumes that each single game bet is 50/50, the true payout should instead be 3:1.

Examples

Typical payouts for up to 10 team parlay bet

The following is an example of a traditional Las Vegas Parlay Card, which shows the typical payouts for an up to 10 team parlay bet based on −110 prices (amount won is assuming $100 is bet) and if every match is 50/50:

NumberOddsAmount wonPayout
2 Team Parlay2.6 to 1$260$360
3 Team Parlay6 to 1$600$700
4 Team Parlay11 to 1$1,100$1,200
5 Team Parlay22 to 1$2,200$2,300
6 Team Parlay45 to 1$4,500$4,600
7 Team Parlay90 to 1$9,000$9,100
8 Team Parlay180 to 1$18,000$18,100
9 Team Parlay360 to 1$36,000$36,100
10 Team Parlay720 to 1$72,000$72,100

Profitability of parlays in sports betting

The best way to analyze if a parlay is profitable in the long term is by calculating the expected value. The formula for expected value is: . Since the probability of all possible events will add up to 1 this can also be looked at as the weighted average of the event. The table below represents odds.[3]

Column 1 = number of individual bets in the parlay

Column 2 = correct odds of winning with 50% chance of winning each individual bet

Column 3 = odds payout of parlay at the sportsbook

Column 4 = correct odds of winning parlay with 55% chance of winning each individual bet

Number of individual betsCorrect odds at 50%Odds payout at sportsbookCorrect odds of winning parlay at 55%
23 to 12.6 to 12.3 to 1
37 to 16 to 15.0 to 1
415 to 112 to 19.9 to 1
531 to 124 to 118.9 to 1
663 to 148 to 135.1 to 1
7127 to 192 to 164.7 to 1
8255 to 1176 to 1118.4 to 1
9511 to 1337 to 1216.1 to 1
101,023 to 1645 to 1393.8 to 1
112,047 to 11,233 to 1716.8 to 1

The table illustrates that if a 55% chance of winning each individual bet were achievable, parlays would be profitable in the long term against the usual house edge. Compare the expected value received on an individual bet at a typical price of −110 with a 55% chance of winning: ((100/110+1)*.55)−1 = .05 (exactly 5 cents won for every dollar bet on average), multiplied by 11 = .55, to the expected return on the 11 game parlay ((1234/717.8)−1) = .719 (72 cents won for every dollar bet on average).

See also

References

  1. "Parlay Betting Guide - How Parlay Bets Work". 26 July 2021.
  2. Funt, Danny (January 17, 2024). "He hit three monster bets — and then the sportsbook wouldn't pay". Retrieved January 17, 2024.
  3. "Converting Odds Into Implied Probabilities". 2022-12-05. Retrieved 2023-04-15.
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