Demystifying Plus Odds: A Data-Driven Guide for Betting on Underdogs
As a sports bettor and statistics geek, I love the puzzle of dissecting odds to find potential value. And few things excite quite like your longshot underdog pick actually winning! But for beginners, seeing something like +650 odds can be confusing. What do these numbers really mean?
In this comprehensive guide, we‘ll unpack how positive odds work, when they offer bet value, and look at memorable underdog winners. You‘ll learn to calculate payouts, convert between formats, and strategize bets on significant underdogs.
Grab a calculator and let‘s dive in!
Odds 101 – Key Betting Terms and Factors
Before looking specifically at plus odds, a quick refresher on key terminology:
- Moneyline – The most basic bet, just picking the outright winner without a point spread.
- Odds – The likelihood ratio set by books balancing profit and risk.
- Favorite – Expected to win and has shorter or negative odds.
- Underdog – Expected to lose and has longer or positive odds.
- Point spread – Handicap set to create a virtual margin the favorite must exceed.
- Handle – Total money wagered on bets.
- Over/under – Bets on total score/points going over or under a set line.
What factors determine how odds get set? Books analyze dimensions like:
- Team performance data – wins, scoring rates, stats, rankings, etc.
- Injuries, roster changes or trades impacting personnel strength.
- Head-to-head records and specific matchup advantages/disadvantages.
- Public betting tendencies and where "sharp" money shows.
They synthesize this information into lines balancing likely actual probabilities with where wagers will come in. The goal is encouraging balanced action on both sides.
How Big is Sports Betting?
Some quick numbers on the massive scale of the sports betting industry:
-
$70 billion was legally wagered on sports in the US in 2021 according to the AGA.
- Football generates the highest handle, with over $27 billion bet on NFL and college in 2021.
- The Super Bowl alone saw ~$7.6 billion wagered in 2022.
The size of these numbers illustrates just how many people engage in sports wagering with real money on the line. Which underscores the importance of truly understanding factors like how various odds work!
Reading Odds – What the Numbers Mean
Let‘s decode these two common ways sportsbooks express the odds for wagers:
Moneyline Odds
- Uses positive or negative numbers like +350, -200.
- Shows potential profit on a $100 bet.
- The higher the number, the bigger underdog.
Decimal Odds
- Uses formats like 1.40 or 4.25.
- The number represents profit per $1 wagered.
- Higher decimals mean longer odds.
Now let‘s explain positive moneyline odds showing underdogs…
What Does Plus (+) Odds Mean?
When you see a "+" symbol before the number, these identify the underdog:
- +650 means a $100 bet would profit $650 if the underdog wins.
- +375 odds return $375 profit on a $100 wager if correct.
- The bigger the number, the longer the odds and expected less chance of winning.
Some examples of other positive moneyline odds:
| Odds | Payout on $100 Bet | Implied Win Probability |
|---|---|---|
| +200 | $300 | 33% |
| +550 | $650 | 15% |
| +1200 | $1300 | 8% |
| +9000 | $9100 | 1% |
Let‘s walk through exactly how to calculate potential payouts.
Calculating Your Payout at Various Plus Odds
The payout on a winning bet equals:
Your Stake x (Moneyline Odds Expressed as Decimal)
For example, a $50 wager at +450 odds:
- Convert +450 moneyline odds to a decimal: 450/100 = 4.5
- Payout = $50 stake x 4.5 = $225
Here are some other examples calculating winnings:
-
Bet $75 at +600 odds
- +600 converts to 6.0 decimal odds.
- $75 x 6.0 = $450 payout.
-
Bet $30 at +1800 odds
- +1800 becomes 18.0 decimal odds
- $30 x 18 = $540 payout
See the direct relationship – the higher the plus number, the bigger a payout your bet stands to return!
Creating a Plus Odds Payout Calculator
To easily calculate potential winnings at various plus odds, I put together this handy Plus Odds Payout Calculator spreadsheet. Just plug in your bet amount and the posted odds.
With a quick glance, you can see the tempting potential payouts. But also remember the lower win probability implied by those lengthy plus odds! More on sensible strategies later.
First, let‘s learn to convert between the different formats sportsbooks use for odds.
Converting Odds Formats
Books across the world use varying odds formats based on tradition and math preference. Converting between them quickly becomes second nature.
Let‘s look at the formulas:
Moneyline Odds to Decimal
- For positive odds, just divide by 100.
- Eg. +250 odds becomes 250/100 = 2.5
- For negative odds, divide 100 by the number and add 1.
- Eg. -150 becomes 100/150 + 1 = 1.67
Decimal Odds to Moneyline
- If over 2.0, subtract 1 and multiply by 100.
- Eg. 4.25 becomes (4.25 – 1) x 100 = +325
- If under 2.0, divide -100 by decimal odds minus 1.
- Eg. 1.62 becomes -100 / (1.62 – 1) = -162
Converting Fractional Odds
- Divide the left number by the right (ignoring the slash).
- Eg. 16/5 odds = 16/5 = 3.2 decimal odds
- Then convert to moneyline as shown above.
- 3.2 decimal = +220 moneyline odds
Let‘s practice converting some sample odds:
| Fractional | Decimal | Moneyline |
|---|---|---|
| 10/3 | 3.33 | +233 |
| 16/5 | 3.2 | +220 |
| 4/6 | 1.67 | -167 |
The odds converter spreadsheet makes translating between formats easy. Never scratch your head at fractional odds again!
Now that you can fluently read odds, let‘s get into strategies for capitalizing on plus odds pots of gold.
Betting Strategies with Positive Odds Underdogs
The chance to score a huge payout on a modest bet makes positive odds enticing. But good betting discipline is still essential. Here are my tips:
- Bet small – anything over +500 is very unlikely. Don‘t go over 2-3% of your bankroll.
- Look for unrecognized matchup advantages the favorite may struggle with.
- Identify trends backing an upset like injuries, venue conditions, situational factors.
- Consider hedging with a smaller play on the favorite at better odds.
Don‘t chase dreamed-up parlays trying to hit it big in one shot. Making smart bets at plus odds when they align with your data takes patience.
Assessing True Win Probability
Is the potential payout worth the implied win probability? Determining the "true" odds involves estimating the underdog‘s realistic chances.
For example, you may think a fighter has a genuine 20% chance to win their bout despite being +400 underdogs (an implied 20% probability). Those plus odds would make sense and likely offer positive expected value.
On the other hand, if you assess an underdog only has a 5% chance of winning, the +900 odds (10% implied probability) might not have sufficient value to warrant a bet.
Of course, this "true" probability is based on your own subjective analysis. The upsets and outliers that give sports betting its unique appeal show that our human predictions will never be perfect!
Hedging Your Bets
One way to minimize risk with underdogs is hedging: placing bets on both sides of a matchup.
For example, you could bet $100 on a +360 underdog and $200 on the -180 favorite. This guarantees a small profit if the favorite wins but leaves room for a nice score if your underdog pick is correct.
Let‘s walk through the math:
- Underdog bet – $100 to win $360. So $460 total if correct.
- Favorite bet – $200 to win $111.11. So $311.11 total.
Your outcomes:
- If underdog wins, you profit $460 – $200 = $260.
- If favorite wins, you profit $311.11 – $100 = $211.11
There‘s some positive value with the hedge as securing a minimum profit, but you sacrifice the huge payout if your underdog succeeds. Let the scale of the plus odds guide your strategy.
Next, we‘ll look at how even improbable longshots can shock the world.
When Lightning Strikes – Notable Upset Stories
The excitement of an unforeseen upset comes from the slim odds of it actually happening. But every so often, miracles unfold and the seemingly impossible occurs. Let‘s reflect on some of these memorable moments:
Buster Douglas Knocks Out Mike Tyson (+4500 Odds)
Tyson looked unbeatable entering this 1990 heavyweight title bout. But Douglas overcame distress in his personal life and Tyson‘s intimidating aura to score a stunning 10th round KO at odds of +4500. The Greatest Upset in sports history.
The 1999 Rams Win the Super Bowl (+1200 Odds)
The Rams sputtered through the 1990s before an offensive explosion led by Kurt Warner and Marshall Faulk. They edged the Titans 23-16 to complete their Cinderella season after starting the year at +1200 odds.
Leicester City Wins Premier League (+5000 Odds)
The ultimate underdog story. Leicester began 2015-16 with +5000 odds of winning England‘s top soccer league. But inspired by players like Jamie Vardy and Riyad Mahrez, they did the unthinkable. This once-in-a-generation shocker was captured in the documentary All or Nothing.
These epic upsets show that while positive odds denote longshots for good reason, lightning can strike! Picking your spots wisely when you detect value presents those same possibilities.
Final Thoughts on Understanding and Navigating Plus Odds
We‘ve covered a ton of ground here. Let‘s recap the key takeaways:
- Odds with a + symbol indicate an underdog expected to lose. The higher the number, the bigger the longshot.
- Calculating potential payouts is simply your bet x the odds expressed decimally.
- Converting between moneyline, decimal and fractional odds is straightforward.
- Focus on spotting favorable situations, not chasing unrealistic parlays.
- Assessing true probabilities remains more art than science. Embrace uncertainty!
I hope these insights from my perspective as a data geek have unlocked the logic of plus odds for you. Now you can bet underdogs with knowledge of the risk-reward tradeoff and potential windfalls.
While the stats say favorites win most often, those upsets keep us watching and wagering. Thanks for reading and may fortune favor the bold with your future underdog bets! Now go let your inner data nerd play the odds.