Mastering the Math: A Step-by-Step Guide on How to Calculate Parlay Odds

12 min read
Aug 20, 2024, 7:43 AM
Author
Nick Ashbourne
Nick Ashbourne
Senior Writer
Last Updated: Sep 19, 2024, 2:29 PM

What is a Parlay Bet?

A parlay bet is a popular form of sports betting where a bettor combines two or more individual bets into one single wager. 

In a parlay, all the bets must win for the entire parlay to be successful. If even one bet in the parlay loses, the entire bet is lost.

However, a parlay payout is significantly higher than placing each bet separately. This is because the payout odds are multiplied, increasing the potential return on the original stake.

Parlays can include a variety of individual wagers, such as point spreads, moneylines, and totals, across different games or within the same game (known as same-game parlays).

Understanding Parlay Odds

Parlay odds refer to the combined betting odds of all the wagers within the parlay. 

Understanding how these odds work is crucial for bettors who want to maximize their potential payouts while managing their risk.

The odds of a parlay are calculated by multiplying the odds of each individual bet. This means that the overall odds of a parlay bet can quickly become large, especially when combining multiple bets with longer odds.

For example, in a two-team parlay, if both teams have odds of +150, the parlay odds would be significantly higher than either bet alone.

How Are Parlay Odds Calculated?

Calculating parlay odds involves multiplying the odds of each individual bet included in the parlay. 

For example, if you place a parlay bet on three teams with American odds of +200, +150, and +100, you would first convert these to decimal odds before multiplying them together. This process will give you the overall parlay odds.

Let's take a more detailed look at this process. Suppose you have the following bets:

  • Team A at +200 (which converts to 3.00 in decimal odds),
  • Team B at +150 (which converts to 2.50),
  • Team C at +100 (which converts to 2.00).

To calculate the parlay odds, you multiply the decimal odds: 3.00 2.50 2.00 = 15.00. These are your overall odds for this parlay. If you wager $100 on this parlay, your potential payout would be $1,500 ($100 * 15.00).

Parlay Odds Formula

The basic formula for calculating parlay odds involves converting American odds to decimal odds and then multiplying those decimal odds together. The formula looks like this:

Decimal Odds = (American Odds / 100) + 1 (for positive odds) or Decimal Odds = 1 - (100 / American Odds) (for negative odds).

Once you have the decimal odds for each individual bet, you simply multiply them together to get the parlay odds. The resulting figure represents the total odds for the parlay bet.

For example, if you're dealing with a two-team parlay with odds of +150 and -110, the calculation would be:

  • Convert +150 to decimal: (150 / 100) + 1 = 2.50
  • Convert -110 to decimal: 1 - (100 / 110) = 1.91
  • Multiply: 2.50 * 1.91 = 4.775

This means the total odds for this parlay bet are 4.775, or approximately 3.78/1 in American terms.

Calculating Parlay Odds with a Parlay Calculator

Parlay Odds

A parlay calculator is a useful tool for quickly determining the potential payout of a parlay bet. It automates the process of converting American odds to decimal odds, multiplying them together, and then multiplying by the bet amount to provide the total potential return.

For example, if you're considering a four-team parlay with odds of +150, +200, -110, and +100, you can input these into a parlay calculator to instantly see the total payout.

The calculator handles the complex multiplication, allowing you to focus on selecting the best bets rather than doing the math yourself.

null
Using a parlay calculator is particularly helpful for bettors who want to explore different parlay combinations or who are new to sports betting and still learning how to calculate parlay odds manually.
 

Types of Parlay Bets

There are several types of parlay bets that bettors can choose from, depending on their strategy and risk tolerance. 

The most common type is the team parlay, where the bettor combines bets on two or more teams to win their respective games. This is popular in sports like football and basketball, where multiple games occur simultaneously.

There are also correlated parlays, where the outcomes of the individual bets are related. For example, in a single NFL game, betting on a team to cover the point spread and on the total score to go over might be correlated.

null
Be aware that sportsbooks often restrict or limit these types of parlays because of their higher likelihood of winning.
 

Risks and Rewards of Parlay Betting

Parlay betting is known for its high-risk, high-reward nature. The potential payouts are much larger than those of single wagers because the odds multiply across each individual bet.

The risk is equally amplified, though, as the bettor must win every single bet within the parlay for the parlay to win, although a push may keep a win in play, albeit at shorter odds.

The risk in parlay betting is that even a small mistake or an unexpected outcome can result in the loss of the entire bet.

null
Bettors should carefully weigh the risk against the potential rewards and consider whether the higher payout is worth the higher chance of losing.
 

Common Parlay Betting Mistakes

One common mistake in parlay betting is overloading the parlay with too many teams or bets.

While adding more bets increases the potential payout, it also significantly increases the risk of losing. 

For example, a bettor might be tempted to create a parlay with six or more bets, drawn by the allure of a massive payout. However, with each additional bet, the chance of the entire parlay losing increases.

Another mistake is ignoring the correlation between bets. Correlated parlays can sometimes seem like a good idea, but many sportsbooks either restrict them or adjust the odds to reflect the increased probability of winning. Bettors should be cautious when combining bets that are not truly independent of each other.

Lastly, some bettors fail to use a parlay calculator to properly assess the potential payouts and risks. 

They might overestimate their chances of winning without understanding how the odds multiply or underestimate the potential payout. Using a parlay calculator can help avoid these mistakes.

Parlay Betting Strategies

Effective parlay betting strategies often involve careful selection of bets and a deep understanding of the odds.

One common strategy is to focus on two-team parlays where the bettor has a strong conviction about both outcomes. This approach reduces the risk compared to larger parlays while still offering a decent payout.

Another strategy is to use parlay calculators to explore different combinations of bets. By testing various scenarios, bettors can identify which combinations offer the best balance of risk and reward.

null
For example, combining a favorite with strong odds with an underdog with longer odds can create a parlay with a good potential payout without being overly risky.

Bettors might also consider using straight bets on individual games where the odds are more favorable, and only parlaying when they feel confident about multiple outcomes. 

This approach helps mitigate the high risk associated with parlays while still allowing for the possibility of larger payouts.

Conclusion

Parlay bets offer an exciting way to engage in sports betting, combining multiple bets into one wager with the potential for larger payouts. The increased risk means that bettors need to be well-informed and strategic when placing parlays.

null
The thrill of potentially turning a small bet into a significant payout can be enticing, but it's important to remember that with higher rewards come a greater chance of losing.

Bettors should always consider whether the potential payout justifies the risk and whether they are comfortable with the possibility of losing the entire bet if just one outcome doesn't go their way.

Parlay Odds FAQ

Odds calculation
How are parlay odds calculated?
Parlay Calculators
What is the benefit of using a parlay calculator?
Correlated Parlays
What are correlated parlays?
Risk Level
Why are parlays considered high-risk?
Moneyline Parlays
What is a moneyline parlay?

Nick has been fascinated with sports since he was first taken to a Toronto Maple Leafs game back in 1998, and he's written about them professionally since 2014.

Nick has covered baseball and hockey for outlets like The Athletic, Sportsnet, and Yahoo Sports, and his sports betting expertise has grown since its legalization in Ontario in 2022. 

Between 2022 and 2023 he worked for a betting startup called NorthStar Bets, and in 2024 he contributed to Oddspedia before joining the Responsible Gambling team.

Interests:
NFL
F1
cycling
NBA
FIFA
NHL
MLB
Travel
Hiking
Cycling

Meet our Authors

Paruyr Shahbazyan began his business career in 2000 as a private entrepreneur. Over thirteen years, he developed a deep understanding for business and leadership, laying a solid foundation for his professional journey.

In 2013, Paruyr stepped into the sports and betting industry as the founder and president of Bookmaker Rating. This online mass media platform, which he led until 2020, focused on providing in-depth analysis and insights in sports betting, earning a reputation for its quality content. 

Continuing his innovative approach in 2022, Paruyr co-founded Azuro, a decentralized betting protocol. This venture showcases his dedication to integrating advanced technology in the evolving landscape of sports betting. Through these diverse experiences, Paruyr has continuously influenced and shaped the betting industry, driving new trends and setting high standards.

 ExperienceYear
Engaged in private entrepreneurship2000-2013
Founder and President at Bookmaker Rating, an online platform focused on sports and betting2013-2020
Co-founder at Azuro, a decentralized betting protocol2022

"Innovation in sportsbetting comes from a deep understanding of both technology and the human element of sports." 

- Paruyr Shahbazyan, Founder, RG

 

Principles and Ethics

Paruyr Shahbazyan's core beliefs lie in the power of informed decision-making and integrity in the betting industry. He understands that the foundation of successful betting is not just about odds and predictions, but also about the trust and reliability of the information provided. Paruyr advocates for a betting environment where transparency and knowledge are paramount, ensuring that bettors are well-equipped with accurate data and insights.

Strategic Vision

Paruyr's vision is to revolutionize the sports betting industry through the integration of technology. He sees the future of betting as a blend of traditional sports knowledge with innovative tech solutions, like decentralized protocols, to enhance user experience and fairness. His aim is to create platforms that are not only user-friendly but also uphold the highest standards of ethical betting, contributing to a more responsible and enjoyable betting culture.

Future Perspectives

Looking towards the future, Paruyr envisions a betting landscape that is more inclusive, technologically advanced, and globally connected. He anticipates a significant shift towards more decentralized and transparent betting systems, driven by blockchain technology. Paruyr is committed to being at the forefront of this change, continuously exploring new possibilities and innovations that can redefine what it means to engage in sports betting in a digital world. His focus is on building systems that prioritize user empowerment, fairness, and the global growth of the sports betting community.

 

Sol Fayerman-Hansen
Sol Fayerman-Hansen
Editor-in-Chief

Sol has over 20 years of experience in writing for diverse industries including sports, gambling, regulation, technology, and startups. As the Editor-in-Chief at RG.org, Sol brings a wealth of knowledge and expertise to the role, focusing on delivering transparent, evidence-based content grounded in thorough research. Sol's mission is to empower readers to enjoy gambling responsibly and make informed decisions, enhancing their overall experience through insightful and engaging content. Under Sol's leadership, RG.org prioritizes the highest standards of integrity and reliability, ensuring that all information provided is accurate and trustworthy. Sol's dedication to transparency and research-based writing helps create a responsible gambling environment where readers can truly benefit from the content. This commitment to excellence has positioned RG.org as a leading source of information in the gambling industry.

Experience:

  • Over 20 years in writing and editing across multiple industries
  • Former head of regional innovation at BMO Finanacial Group
  • Senior Writer, Online Casino Reports
Cristina Varela Galan
Cristina Varela Galan
Problem Gambling Expert

Cristina used to work as a Psychology Assistant in the Bizkaia Pathological and Risky Gamblers Association. She was also part of a research team in Deusto University, specializing in pathological gambling area. While working there, she managed to develop her own project 

 “Exploring the association between emotional regulation, alexithymia, stressful life events and gambling in adolescent and young adult women”.

Nick Ashbourne
Nick Ashbourne
Senior Writer

Nick has been fascinated with sports since he was first taken to a Toronto Maple Leafs game back in 1998, and he's written about them professionally since 2014.

Nick has covered baseball and hockey for outlets like The Athletic, Sportsnet, and Yahoo Sports, and his sports betting expertise has grown since its legalization in Ontario in 2022. 

Between 2022 and 2023 he worked for a betting startup called NorthStar Bets, and in 2024 he contributed to Oddspedia before joining the Responsible Gambling team.

Sergey Demidov
Sergey Demidov
Head of News Department

Sergey has been in sports journalism since 2007 as a reporter, editor, and manager. He has covered the Olympic Games, soccer World Cups, the World Cup of Hockey in 2016, the European championships, the Stanley Cup Finals, IOC events, and many others. Sergey interviewed the sport's greatest athletes, coaches, and executives. Since 2016, he has been an Independent Senior Editor of NHL.com/ru.

Anna Kravtcova
Anna Kravtcova
Problem Gambling Expert

Ph.D. in organizational psychology, an internationally certified psychologist (EuroPsy 2022, Cognitive behavioural therapy of mindfulness 2020, International Society for Emotional Intelligence 2017, Russian Psychological society 2014, American Psychological Association(Society for Industrial and Organizational Psychologist) 2011), speaker of many international conferences (USA, Brazil, Portugal, Czech Republic, Russia, etc.). TEDx speaker.

Show More