Understanding Odds and Betting Markets

9 min read
Dec 17, 2023, 12:58 PM
Author
Sol Fayerman-Hansen
Sol Fayerman-Hansen
Editor-in-Chief
Fact checked by:
Paruyr Shahbazyan
Paruyr Shahbazyan
Founder
Last Updated: Jan 8, 2025, 3:03 PM

Don't Let the Odds Confuse You

Understanding betting odds is essential for anyone interested in sports betting. Odds are not just numbers; they represent the probability of an outcome happening and are carefully structured by bookmakers. A mix of statistical analysis, public sentiment, and market demand influences sports betting odds and complex algorithms used by sportsbooks to dial in the lines. Odds reflect implied probability and include a margin for bookmakers to ensure profitability. This means that betting odds are not always an accurate representation of true probabilities but are influenced by market dynamics and bookmaker strategies as well.

In this guide, you will learn everything there is to know about sports betting odds and betting markets, how they work, how sportsbooks make money with them, and how to compare odds to ensure you get the best value for your bets.

Always treat betting as a form of entertainment rather than a way to make money. Set a budget for each betting session, stick to it, and avoid chasing losses. Understanding that odds are structured to favor bookmakers is essential; keeping this in mind can help in making more grounded and informed decisions.

Want to listen to this guide on Spotify? Check out the episode and follow for more.

Understanding Types of Betting Odds

Betting odds can be expressed in several formats, including American odds, decimal odds, and fractional odds. Each format provides a unique way to read betting odds and interpret how much profit a bet wins and the implied probability of an event happening.

American Betting Odds Explained

  • Typically used in North America, these odds are marked by positive (+) or negative (-) numbers.
  • A positive number indicates how much you would win on a $100 initial wager (e.g., +150 means a $100 bet would win $150).
  • A negative number shows how much you must bet to win $100 (e.g., -150 means you must bet $150 to win $100).
  • Formula: Profit = (Stake * Odds) / 100 for positive odds. For negative odds, Profit = Stake / (Odds / 100).

Decimal Odds Explained

  • European odds, these odds represent the total payout for every $1 wagered.
  • Example: Decimal odds of 2.50 mean a $100 bet returns $250 ($150 profit and $100 stake).
  • Formula: Total Payout = Stake * Decimal Odds.

Fractional Odds Explained

  • Fractional odds are often used in horse racing and by UK bookmakers, showing the potential profit relative to the stake.
  • Example: 5/1 odds mean a $1 bet yields $5 in profit, with a total payout of $6 (stake + profit).
  • Formula: Profit = (Stake * Numerator) / Denominator; Total Payout = Profit + Stake.

How Sports Betting Odds Work

Understanding betting odds and how they work is crucial for bettors looking to make informed decisions. Using examples from popular sportsbooks like BetMGM, FanDuel, DraftKings, BetRivers, Caesars, and Hard Rock Bet, here’s a practical look at how odds apply to real teams in the NFL, NBA, NHL, and the MLB.

NFL Example: Kansas City Chiefs vs. Cincinnati Bengals (Moneyline Odds)

  • BetMGM offers odds of +150 on the Bengals and -200 on the Chiefs.
  • Bet on Bengals (+150): A $100 wager brings $150 in profit ($250 total payout).
  • Bet on Chiefs (-200): You need to wager $200 to win $100 profit ($300 total payout).

NBA Example: Boston Celtics vs. Los Angeles Lakers (Point Spread)

  • FanDuel online sportsbook sets the point spread at Celtics -5.5 (-110) and Lakers +5.5 (-110).
  • Bet on Celtics (-5.5): They must win by 6 or more points for the bet to win. A $100 bet yields $90.91 in profit ($190.91 total payout).
  • Bet on Lakers (+5.5): They must lose by 5 points or fewer or win outright. A $100 bet also yields $90.91 in profit.

NHL Example: Toronto Maple Leafs vs. New York Rangers (Over/Under)

  • DraftKings sets the total goals line at 6.5, with odds of Over -120 and Under +100.
  • Bet on Over (-120): If the combined score is 7 or more, a $120 wager yields $100 profit ($220 total payout).
  • Bet on Under (+100): If the total score is 6 or fewer, a $100 wager yields $100 profit ($200 total payout).

MLB Example: New York Yankees vs. Los Angeles Dodgers (Run Line)

  • BetRivers offers Dodgers -1.5 (+125) and Yankees +1.5 (-145).
  • Bet on Dodgers (-1.5): They must win by 2 or more runs. A $100 bet yields $125 in profit ($225 total payout).
  • Bet on Yankees (+1.5): They can lose by 1 run or win outright. A $145 bet yields $100 in profit ($245 total payout).
SportsbookEventBetOddsScenarioProfit on $100 BetTotal Payout
BetMGMNFL: Chiefs vs. BengalsBengals Win+150Bengals win the game outright$150$250
FanDuelNBA: Celtics vs. LakersCeltics Cover (-5.5)-110Celtics win by 6+ points$90.91$190.91
DraftKingsNHL: Maple Leafs vs. RangersOver 6.5 Goals-1207 or more total goals scored$83.33$183.33
BetRiversMLB: Dodgers vs. YankeesDodgers -1.5+125Dodgers win by 2+ runs$125$225
Hard Rock BetNFL: Chiefs vs. BengalsChiefs Win-200Chiefs win the game$50$150

Betting Odds and the Role of Implied Probability

Implied probability is a way to convert betting odds into a percentage representing the likelihood of an event occurring, according to the sportsbook. It gives bettors insights into the probability of winning a bet based on odds and helps identify whether a bet offers value. Whether you're new to betting or an experienced player, understanding how odds work and implied probability is fundamental to making informed decisions.

The chart above illustrates the concept of implied probability as it relates to American betting odds. Implied probability converts betting odds into a percentage that represents the likelihood of a particular outcome occurring, according to the odds.

  • -200 odds: Represent a 66.7% implied probability, meaning the event is expected to occur two-thirds of the time.
  • +100 odds: Equal a 50.0% implied probability, reflecting an even chance (1 in 2) for the outcome.
  • +200 odds: Correspond to a 33.3% implied probability, indicating a one-third chance of the event happening.

This visualization helps bettors and analysts better understand how American odds relate to expected probabilities, making it easier to evaluate risk and make informed decisions.

How to Calculate Implied Probability

The formula for implied probability varies depending on the type of odds being used. Here’s a breakdown of how odds work in American betting odds:

American Betting Odds (Positive Numbers)

  • For positive odds:
    Implied Probability = 100 / (Odds + 100) * 100
  • Example: Odds of +150
    Implied Probability = 100 / (150 + 100) 100
    Implied Probability = 100 / 250 100
    Implied Probability = 40%
  • This means the sportsbook believes there’s a 40% chance of the outcome occurring.

American Betting Odds (Negative Numbers)

  • For negative odds:
    Implied Probability = Absolute Value of Odds / (Absolute Value of Odds + 100) * 100
  • Example: Odds of -200
    Implied Probability = 200 / (200 + 100) 100
    Implied Probability = 200 / 300 100
    Implied Probability = 66.67%
  • This indicates a 66.67% probability of winning.

Decimal Odds

  • For decimal odds:
    Implied Probability = 1 / Decimal Odds * 100
  • Example: Odds of 2.50
    Implied Probability = 1 / 2.50 100
    Implied Probability = 0.4 100
    Implied Probability = 40%
  • This demonstrates that the sportsbook estimates a 40% chance of the sporting event outcome happening.

Fractional Odds

  • To calculate the implied probability for fractional odds:
    Decimal Odds = Fractional Odds + 1
    Implied Probability = 1 / Decimal Odds * 100
  • Example: Odds of 5/1
    Decimal Odds = 5 + 1 = 6.00
    Implied Probability = 1 / 6.00 100
    Implied Probability = 0.1667 100
    Implied Probability = 16.67%
  • Here, there is a 16.67% probability of winning.

Sportsbook Profit Margin: The Juice or Vigorish ('Vig')

The juice, or vigorish (vig), is the hidden commission bookmakers charge for facilitating bets. It ensures that sportsbooks remain profitable regardless of the outcome of a sporting event. This subtle margin is baked into the odds and impacts how much you could win from a bet.

How the Vig Works

The vig is embedded in the odds, often appearing as small discrepancies in the implied probability of all potential outcomes. For example, in evenly matched sporting events, where two teams have a near 50% chance of winning, you might expect American betting odds to be displayed at +100 for both. However, sportsbooks typically offer odds like -110 on either side of a point spread to include their commission.

Here’s what this means for bettors:

  • Odds of -110 mean you must bet $110 to win $100 in profit.
  • The extra $10 represents the vig, ensuring the sportsbook takes a guaranteed cut regardless of which team wins.

Real-World Example of the Vig in Action

Let’s consider a point spread bet on the Kansas City Chiefs vs. Cincinnati Bengals:

  • Chiefs: -110
  • Bengals: -110

Implied Probability Calculation:

  • Chiefs: Implied Probability = 110 / (110 + 100) * 100 = 52.38%
  • Bengals: Implied Probability = 110 / (110 + 100) * 100 = 52.38%
  • Total Implied Probability = 52.38% (Chiefs) + 52.38% (Bengals) = 104.76%

The extra 4.76% reflects the vig, ensuring the sportsbook retains a margin regardless of the outcome. Without the vig, the probabilities would be 100%, representing a fair bet.

The Formula for Calculating Vig

The vig can be calculated with the following formula, helping you determine how much commission is factored into a bet:

  • Vig Percentage = (Sum of Implied Probabilities - 100%)
  • Using the Chiefs vs. Bengals example:
  • Vig = 104.76% - 100% = 4.76%

How the House Always Wins Over Time

The juice is the foundation of the sportsbook's business model. Here’s why the house always wins:

  1. Guaranteed Margins: Sportsbooks profit regardless of the outcome by incorporating the vig into the odds. For example, even if equal amounts are wagered on both teams, the bookmaker collects more in losing bets than it pays out to winners.
  2. Adjusting Lines: Sportsbooks adjust lines to balance the money wagered on both sides of a bet. This minimizes their risk and maximizes their profitability from the vig.
  3. Betting Public Behavior: Casual bettors often favor popular teams or athletes, creating additional opportunities for sportsbooks to adjust odds in their favor.

Vig on Totals and Moneylines

The vig is not limited to point spreads; it also applies to totals and moneyline bets.

Totals (Over/Under)
  • Example: Over 6.5 (-120) and Under 6.5 (+100) in an NHL game.
  • Vig: The negative odds on the over reflect a higher implied probability (and thus a larger vig) than the even odds on the under.
Moneylines
  • Example: Bruins (-200) and Canadiens (+175).
  • Vig: The difference in implied probabilities between these odds ensures the sportsbook’s margin.

Vig and Bankroll Management

The vig directly affects your bottom line, making it crucial to account for it in your betting strategy. Here are key tips for managing the impact of the vig:

Shop for the Best Odds: Compare odds across multiple sportsbooks to find the lowest vig.

Here is an example of what to look for when doing a sportsbook odds comparison:

SportsbookChiefs Odds (Moneyline)Bengals Odds (Moneyline)Point SpreadTotal (Over/Under)
BetMGM-180 (Best Odds)+150 (Best Odds)Chiefs -2.5 (-110)Over 47.5 (-110) / Under 47.5 (-110)
BetRivers-190+140Chiefs -2.5 (-115)Over 47.5 (-112) / Under 47.5 (-108)
FanDuel-185+145Chiefs -2.5 (-112)Over 47.5 (-115) / Under 47.5 (-105)
DraftKings-195+135Chiefs -2.5 (-120)Over 47.5 (-110) / Under 47.5 (-110)
Key Takeaways:
  • Moneyline: BetMGM offers the best odds on the Chiefs (-180) and the Bengals (+150). Bettors get better value compared to other sportsbooks.
  • Point Spread: BetMGM and DraftKings set the spread at -2.5 for the Chiefs, but BetMGM has more favorable juice at -110 than DraftKings' -120.
  • Totals (Over/Under): BetMGM offers standard -110 odds for both over and under, making it a better choice than FanDuel and BetRivers, which charge higher juice.
  • Identify Value Bets: Focus on bets where the implied probability (adjusted for the vig) is lower than your estimate of the probability of winning.

Identifying a value bet

Scenario: WNBA Matchup – Indiana Fever vs. Las Vegas Aces

DraftKings Sportsbook Odds
  • Fever: +200
    Aces: -250
Calculate the Implied Probability

For Aces (-250):

  • Implied Probability = Absolute Value of Odds / (Absolute Value of Odds + 100) 100
    Implied Probability = 250 / (250 + 100) 100
    Implied Probability = 250 / 350 * 100
    Implied Probability = 71.43%

For Fever (+200):

  • Implied Probability = 100 / (Odds + 100) 100
    Implied Probability = 100 / (200 + 100) 100
    Implied Probability = 100 / 300 * 100
    Implied Probability = 33.33%

Combined Implied Probability = Aces (71.43%) + Fever (33.33%) = 104.76%

The extra 4.76% is the vig included by the sportsbook.

Adjust for the Vig

To remove the vig and get the fair probabilities:

  • Adjusted Probability (Aces) = 71.43% / 104.76% = 68.20%
  • Adjusted Probability (Fever) = 33.33% / 104.76% = 31.80%
Compare to Your Estimate

Let’s say you analyze the matchup and estimate:

  • Fever has a 40% probability of winning, based on Caitlin Clark’s incredible scoring ability and the Fever’s recent improvements.
  • Aces have a 60% probability of winning, considering their dominant record and home-court advantage.

Identify the Value Bet

  • Fever: The adjusted implied probability from the sportsbook is 31.80%, but your estimate is 40%, indicating a value bet. The sportsbook is undervaluing the Fever’s chances of winning.
  • Aces: The adjusted implied probability is 68.20%, but your estimate is 60%, showing no value in betting on the Aces, as the sportsbook overestimates their chances of winning.

What to Watch Out For

Don’t go for Small Margins: High-vig markets like parlays and teasers have higher vig built into the odds, which reduces your long-term profitability. They are attractive because they pay more, but the vig compounds across multiple selections, and you pay more to the sportsbook. To understand the odds, you must understand that over time, this increases the edge of the book and makes it harder for you to win consistently. Go for single bets with lower vig for long-term success.

Know the Cost of Losing: The vig reduces your winnings and increases the cost of losing over time. When you lose a bet, the book still collects its commission, so it’s harder to get back to even. For example, if you bet -110, you must win 52.38% of the time just to break even. Losing often without calculated decisions compounds this effect and drains your bankroll faster in high-vig markets. This is why you need to analyze the odds, find value bets, and avoid bets with a house edge that is too high.

Key Takeaways

  • The vig ensures sportsbooks profit regardless of the outcome of a sporting event.
  • Calculating the vig helps you understand the odds and evaluate the fairness of a wager.
  • Managing the impact of the vig through shopping odds and strategic betting can improve your profitability.

How Odds Boost Offers Can Improve Winning Bets

Odds boosts are promotional tools sportsbooks offer to enhance the payout odds on selected bets. While they do not change the likelihood of an event occurring, they increase the potential return for a winning bet. Odds boosts can effectively reduce the vig for the bettor, providing better value without altering the risk.

Example of an Odds Boost

FanDuel Odds Boost

  • Original Bet: Kansas City Chiefs to win at -150 odds.
  • Odds Boost: Boosted to +100 odds.
  • Explanation: At -150 odds, a $100 wager would yield $66.67 profit (total payout of $166.67). With the odds boost to +100, the same $100 wager yields $100 profit (total payout of $200).
  • Reduced Vig: Without the boost, the sportsbook collects its commission by offering slightly lower payouts. The boost effectively reduces the vig, giving the bettor a more favorable deal.

How Odds Boosts Reduce Vig

When odds are boosted, the implied probability of the event (calculated from the odds) shifts closer to the true probability of the event occurring. This adjustment reduces the vig.

For example:

  • Original Odds: Chiefs -150
  • Implied Probability = 150 / (150 + 100) * 100 = 60%
  • The vig accounts for the gap between the implied probability and the actual odds offered.
  • Boosted Odds: Chiefs +100
  • Implied Probability = 100 / (100 + 100) * 100 = 50%
  • The boosted odds decrease the vig, making the bet more favorable for the bettor.
  • By reducing the vig, the sportsbook takes a smaller commission on the boosted bet, making it a better deal for the bettor while still promoting engagement.

Key Considerations

  • Better Value for the Bettor: Odds boosts effectively reduce the sportsbook’s margin, increasing the bettor’s potential winnings without additional risk.
  • Marketing Strategy for Sportsbooks: While bettors benefit from reduced vig, sportsbooks use odds boosts to attract new customers and encourage more wagers. They rely on volume to offset the smaller margins.
  • Analyze the Boosted Bet: Even with reduced vig, bettors should carefully evaluate whether the boosted bet aligns with their own estimation of the probability of winning. Odds boosts are only valuable if the underlying bet is strategically sound.

Betting Markets and Odds Interaction

Betting MarketDescriptionOdds Interaction
MoneylineBet on which team/player will win outright.Odds reflect the implied probability of either side winning.
Point SpreadBet on the margin of victory or defeat.Odds are typically set at -110 for both sides, incorporating vig.
Totals (Over/Under)Bet on whether the total score exceeds a set line.Odds are often near -110, adjusted based on betting volume and sportsbook risk.
ParlaysCombine multiple bets for higher payouts.Odds multiply across selections; higher risk means larger payouts.
TeasersAdjust the spread or totals line for lower risk.Odds are reduced compared to standard parlays due to adjusted lines.
Prop BetsBet on specific events within a game.Odds vary widely; sportsbooks factor in lower likelihood and higher vig.
FuturesBet on outcomes like championships or MVPs.Odds fluctuate over time based on team/player performance and betting volume.
Live/In-Play BettingBet during the game on dynamic events.Odds adjust in real-time based on game developments and remaining time.
Round RobinsMultiple parlays from selected teams.Odds calculated for each parlay; higher vig due to multiple combinations.
Handicap BettingSimilar to point spreads, popular in global sports.Odds reflect adjusted lines for perceived team strengths.
Double ChanceBet on two possible outcomes (e.g., win/draw).Odds lower than single outcomes due to reduced risk.
Correct ScorePredict the exact final score.Odds are high, reflecting low probability of exact outcomes.
Player PropsBet on individual player performances (e.g., points scored).Odds incorporate player statistics and public perception.
Team PropsBet on specific team-related events (e.g., first to score).Odds based on historical team trends and match dynamics.
OutrightsSimilar to futures, it focuses on tournaments/events.Odds change as event progresses and favorites emerge.
Asian HandicapAdjusts the spread with fractional values.Odds eliminate the possibility of a draw, simplifying betting.
Both Teams to ScoreBet on whether both teams will score.Odds reflect team scoring trends and defensive strength.
First Half/Second HalfBet on outcomes limited to a specific half.Odds often similar to full-game bets but adjusted for time limitations.
Winning MarginPredict the margin of victory.Odds increase with more specific margin predictions.
Exacta/TrifectaPredict order of finish in races (e.g., 1st, 2nd).Odds are high due to the difficulty of predicting exact outcomes.
Spread Totals ComboCombine point spread and totals in one bet.Odds calculated for combined likelihood, typically higher payouts.
Overtime BettingBet on whether a game goes into overtime.Odds are high due to the rarity of overtime situations.
Draw No BetBet removes the draw outcome, refunding if tied.Odds are lower than standard moneyline due to reduced risk.
Halftime/FulltimeBet on the result at halftime and fulltime.Odds multiply for predicting both outcomes accurately.
AccumulatorsSimilar to parlays, common in global sportsbooks.Odds multiply for each leg; vig increases with more selections.
Season Win TotalsBet on the number of wins a team achieves in a season.Odds adjust throughout the season based on performance and injuries.
Time of First GoalPredict the exact time of the first goal.Odds are high due to the specificity of the bet.
Next Play/ScoreBet live on the next event in the game.Odds are dynamic and adjust based on game flow and recent events.
Penalty BettingBet on penalties awarded or scored in a match.Odds depend on the likelihood of penalties based on historical trends.
Specials/Novelty BetsUnique markets (e.g., coin toss, anthem length).Odds set based on rarity and betting volume for entertainment-based outcomes.

Understanding Odds and Betting Markets FAQs

Understanding Odds Formats

What Are the Most Common Betting Odds Formats, and Where Are They Used?

Betting odds are typically expressed in American odds, decimal odds, or fractional odds:

  • American Odds: Used primarily in the US, marked by positive (+) or negative (-) numbers.
  • Decimal Odds: Popular in Europe and global online sportsbooks, showing total payout for every $1 you bet.
  • Fractional Odds: Common in horse racing and UK betting sites, showing potential profit relative to the stake.
How Do Decimal Odds Differ from Fractional Odds?

Decimal odds provide a straightforward calculation of total payouts, while fractional odds work by showing only the profit portion relative to the stake. For instance:

  • Decimal Odds: 3.00 = $300 payout on a $100 bet.
  • Fractional Odds: 2/1 = $200 profit on a $100 bet, total payout of $300.

Maximizing Value

Why Do Different Sportsbooks Offer Different Odds?

Odds are displayed based on market trends, statistical analysis, and public betting behavior. Some sportsbooks, such as BetMGM or DraftKings, may provide higher odds or promotional offers like bonus bets to attract customers.

What Does "Value Bet" Mean, and How Can You Identify One?

A value bet occurs when the implied probability calculated from the odds format is lower than your personal estimation of the event’s likelihood. For example:

If reading sports betting odds suggests a 60% probability of winning the game, but you estimate a 70% chance, this bet offers value.

How Can Bonus Bets Help Maximize Returns?

Bonus bets reduce risk by allowing you to wager without using your own funds. Use these strategically:

  • For low odds, to secure small but likely returns.
  • For high odds, to maximize potential profits on risk-free bets.

Calculations and Payouts

How Are Potential Winnings Calculated with Different Odds Formats?
  • American Odds:
    • Positive (+200): Profit = Stake * (Odds / 100).
    • Negative (-150): Profit = Stake / (Odds / 100).
  • Decimal Odds: Profit = Stake * (Odds - 1).
  • Fractional Odds: Profit = Stake * (Numerator / Denominator).
How Does Implied Probability Help Calculate Fair Bets?

Implied probability translates betting odds explained into percentages. Use this to evaluate fair bets:

  • Example: Odds of -200 imply a 66.67% probability of winning.
  • Compare this to your own estimate to determine if the sportsbook undervalues the event’s likelihood.

Betting Strategies

How Do Odds Work for Multi-Leg Bets Like Parlays?

In parlays, odds for each leg are multiplied. This results in higher odds and larger payouts but also significantly increases risk:

  • A single loss results in losing the entire wager.
  • Higher vig is typically embedded due to the compounded risk.
What Are the Risks of High-Vig Markets?

Markets like parlays and teasers include a betting line that embeds higher commissions. Over time, this reduces profitability:

  • Focus on single bets with lower vig for sustainable success.

Horse Racing and Specialty Bets

How Are Odds in Horse Racing Typically Expressed?

Fractional betting odds dominate in horse racing. They are simple to read:

  • 5/1 odds: For every $1 you bet, you win $5 in profit, for a total payout of $6.
  • Converting odds to decimal can simplify calculations for multi-race wagers.

Responsible Gambling

How Can I Manage the Cost of Losing?

Understand that vig compounds over time with losses. Consistently placing bets with lower odds or high vig means you’ll need to win more often to break even:

Focus on calculated decisions and avoid chasing losses.

What Are Responsible Gambling Practices for New Bettors?
  • Set limits for your bankroll and wager only what you can afford to lose.
  • Treat sports betting as entertainment, not a source of income.
  • Use betting sites offering tools to track spending.

References and Latest Updates

Sources
Page Revisions
FanDuel
2025
NFL Odds at FanDuel
https://sportsbook.fanduel.com/
DraftKings
2025
Odds at DraftKings
https://www.draftkings.com/
Current (January 02, 2025)
Current
Written By
Sol Fayerman-Hansen
Checked By
Nick Ashbourne

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Paruyr Shahbazyan started his business career as an entrepreneur in 2000. Over 13 years, he learned business and leadership, which laid the foundation for his career.

In 2013, Paruyr entered the sports and betting industry as the founder and president of Bookmaker Rating, an online media platform he led until 2020. The platform focuses on in-depth analysis and insights in sports betting and has gained a reputation for quality content.

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