Compare n' Bet™
Compare n' Bet™
A plain-English guide to reading a line, spotting a good price, and understanding what those numbers actually mean.
Nearly every sports bet you see falls into one of three buckets: moneyline, spread, or total. Before you worry about numbers and formats, it helps to understand what you are actually betting on.
A moneyline bet is the simplest wager in sports. You pick which team or player will win the game, and if they win, you win. No point calculations, no complicated conditions. The only thing that varies is how much you win depending on who the favorite is.
Say the Lakers are playing the Timberwolves. If the Lakers are heavily favored, the sportsbook might list them at -250 and the Timberwolves at +200. Those numbers are American odds, which we will unpack in a minute. For now, just know that a negative number means the favorite and a positive number means the underdog. The bigger the gap between the two, the more one side is favored.
A point spread is what sportsbooks use to make mismatched games interesting to bet on. Instead of just picking a winner, you pick whether a team will win or lose by a certain margin. The favorite gives up points. The underdog gets points.
If the Chiefs are favored by 7 against the Broncos, the spread is listed as Chiefs -7 and Broncos +7. If you bet the Chiefs, they need to win by more than 7 points for your bet to cash. If you bet the Broncos, they either need to win outright or lose by less than 7. If the Chiefs win by exactly 7, that is called a push, and everyone gets their money back.
Both sides of a standard spread are usually priced around -110, which means you have to risk $110 to win $100. That extra $10 is the sportsbook's cut, also called the vig or juice.
A totals bet, often called an over/under, has you wager on the combined score of both teams. The sportsbook sets a number, and you bet whether the actual combined score will go over or under it.
If the total in a Thunder-Warriors game is set at 232.5, you are betting whether both teams combined will score more than 232 or fewer than 233. Sportsbooks usually use half-points like 232.5 to prevent pushes. If the total is a whole number like 233 and the game lands exactly on 233, the bet is a push.
American odds, also sometimes called moneyline odds, are the most common format you will see in the United States. They look like this: +180, -140, +350, -1500. Once you understand the logic, they are easy to read.
A negative number tells you how much you need to bet to win $100. If a team is listed at -140, you risk $140 to win $100. If they win, you get back $240 total (your original $140 plus $100 in profit). If they lose, you lose the $140.
The more negative the number, the bigger the favorite and the less you win per dollar risked. A -500 favorite means you have to risk $500 to win $100, because the outcome is considered very likely.
A positive number tells you how much you win on a $100 bet. If a team is listed at +180, a $100 bet wins you $180. If they win, you get back $280 total (your original $100 plus $180 in profit).
The more positive the number, the bigger the underdog and the more you win per dollar risked. A +800 underdog is a long shot. A $100 bet pays $800 if they pull off the upset.
Let's say you want to bet $20 on a team listed at -150. To figure out your potential winnings: divide 100 by 150 to get 0.667, then multiply by your $20 wager. You would win about $13.33 if the bet hits.
For a team at +250 with a $20 bet: divide 250 by 100 to get 2.5, then multiply by $20. You would win $50 if the bet hits.
If the math makes your head spin, don't worry. Every sportsbook and every odds comparison site (including this one) calculates your payout for you before you place the bet.
American odds are only common in the United States. The rest of the world mostly uses decimal odds, and the UK and Ireland often use fractional odds. If you are browsing international markets or using a book like Pinnacle that defaults to decimal, here is the quick version.
Decimal odds show you your total return (including your stake) per dollar bet. If the odds are 2.50, a $10 bet returns $25 total, which is $15 in profit plus your original $10 back.
Decimal odds of 2.00 are the equivalent of +100 in American odds, also known as even money. Anything above 2.00 is an underdog. Anything below 2.00 is a favorite.
Fractional odds show the profit per unit bet. Odds of 5/1 (read as "five to one") mean you win $5 in profit for every $1 you bet. Odds of 1/4 mean you win $1 in profit for every $4 you bet.
To convert fractional to decimal, divide the fraction and add 1. So 5/1 becomes 5 + 1 = 6.00 decimal. And 1/4 becomes 0.25 + 1 = 1.25 decimal.
Every price on a sportsbook can be converted into an implied probability, which is the percentage chance the book is assigning to that outcome. This is one of the most useful concepts in betting, because it lets you compare the sportsbook's opinion to your own.
For negative American odds: divide the odds by (odds + 100). For example, -150 becomes 150 / (150 + 100) = 150 / 250 = 60%. The sportsbook is saying this side has a 60% chance to win.
For positive American odds: divide 100 by (odds + 100). For example, +200 becomes 100 / (200 + 100) = 100 / 300 = 33.3%. The sportsbook is saying this side has a 33.3% chance to win.
If you calculate implied probability for both sides of any bet, they will almost always add up to more than 100%. This is the sportsbook's built-in margin, called the vig or juice. It is how they guarantee themselves a profit over the long run.
A game priced at -110 on both sides gives each team an implied probability of 52.38%. Added together, that's 104.76%. The extra 4.76% is the book's cut. That's why shopping for better prices across multiple sportsbooks matters so much. Even a small difference in odds can significantly change your expected return over time.
If you check the same game on the same sportsbook a few hours apart, the odds may have shifted. This is normal. Lines move for a few reasons.
The most common cause of line movement is one-sided betting. If a sportsbook is taking heavy action on one team, they will adjust the line to encourage more bets on the other side. This helps them balance their exposure and protect themselves from a big loss.
Injury news, lineup changes, weather reports, and coaching decisions all affect lines. If a starting quarterback gets downgraded to questionable, the spread on that game will move within minutes. Professional bettors watch for this kind of news and try to get their bets in before the line adjusts.
Sportsbooks track which accounts win consistently. When a bettor with a strong track record (a "sharp") places a bet, the book often moves the line even if the amount wagered is small. Sharp money is treated as a signal that the line is wrong.
Not all sportsbooks offer the same price on the same bet. One book might have the Chiefs at -7 while another has them at -6.5. That half-point difference can be the difference between winning and losing a bet.
The same goes for moneylines and totals. Two books might list the same game with odds ranging from +140 to +165 on the underdog. Taking the +165 instead of the +140 means a $100 bet pays $25 more if the bet wins. Over a season of betting, those differences add up fast.
This is exactly what Compare n' Bet is built to do. Every game shows odds from multiple sportsbooks at the same time, with the best available price clearly marked. You can also see how each book's price stacks up against the fair line, which helps you tell when a book is genuinely offering value and when you are paying extra vig.
This guide is for informational purposes only. Compare n' Bet does not offer gambling advice or guarantee any outcomes. Past performance does not guarantee future results. Please gamble responsibly.