This arrangement tells us a lot: which team is home (listed on bottom, in this case the Seattle Seahawks), which team is the underdog (listed with a plus sign next to their name, in this case the New England Patriots), we know which team is the favorite (listed with a minus sign next to their name, in this case the Seattle Seahawks), and we know the point spread (2.5 points).
Totalizators. In totalizators (sometimes called flexible-rate bets) the odds are changing in real-time according to the share of total exchange each of the possible outcomes have received taking into account the return rate of the bookmaker offering the bet. For example: If the bookmakers return percentage is 90%, 90% of the amount placed on the winning result will be given back to bettors and 10% goes to the bookmaker. Naturally the more money bet on a certain result, the smaller the odds on that outcome become. This is similar to parimutuel wagering in horse racing and dog racing.

Generally, the number next to the spread is “-110”. This is what’s known as the juice, vig or odds. The juice is a fraction of the wager taken from the bettor if the bet wins. In this instance, a winning wager of $110 will yield a profit of $100.The example above demonstrates that, although Indianapolis won the contest, Tennessee covered the spread by losing by less than nine points. An important aspect of sports betting is capturing the best line possible. A great way to achieve this is by shopping for the best line.
It is important to note the difference between spreads in sports wagering in the U.S. and sports spread betting in the UK. In the U.S. betting on the spread is effectively still a fixed risk bet on a line offered by the bookmaker with a known return if the gambler correctly bets with either the underdog or the favourite on the line offered and a known loss if the gambler incorrectly bets on the line. In the UK betting above or below the spread does not have a known final profits or loss, with these figures determined by the number of unit points the level of the final outcome ends up being either above or below the spread, multiplied by the stake chosen by the gambler.
How the point spread works - When two teams meet on the playing field or on the basketball court, one team is typically better than the other or in a more favorable position because of factors like playing at home. If all you had to do were pick the winning team in a game, everybody would simply wager on the best team or the home team in a even matchup and bypass all the lines and collect their winnings at a high rate.
If the bookmaker was only confident enough to give Seattle a field goal’s lead on the Patriots, it was clearly going to be a tight game. Oddsmakers aren’t often that wrong about flagship games like the Super Bowl. All things being equal, it’s likely the betting public would have taken the Seahawks to win the game and have been done with it. But throw in the point spread that gave the Patriots 2.5 points, and the proposition seems more equal.
What's the difference between an oddsmaker and a bookie? A bookie's job is purely mechanical. He gets the line from Vegas or another source, offers bets at those odds, then collects money from the losers, pays out to the winners and keeps the vig. Oddsmakers don't actually take bets -- they study the games and set the lines. Bookies often adjust the spreads for their games, so they do a little oddsmaking, and oddsmakers work for casinos, which operate sports books that take bets.
To show how this can be exploited, take a point spread of -8.5 at odds of -110. This is a 50/50 proposition. Let's assume you've purchased enough points to move the spread to -6.5 at odds of -150. Now, you'd win instead of lose 6.24% of the time they win by 8, and 6.59% of the time they win by 7. Add these together with the 50% from the original proposition, and we get 62.83%.
The most common way to bet football is against the pointspread (ATS), often called a side bet. This involves making a wager on either the favorite or the underdog. For example, Team A is a 7-point favorite (-7) against Team B, making Team B a 7-point underdog (+7). If you bet on Team A, it must win by more than seven points for you to win your bet. Conversely, if you bet on Team B, it must lose by less than seven points for you to win your bet. Of course, if Team B wins outright, you also win your bet. If Team A wins by exactly seven points, your bet pushes and your wager is refunded.
The first thing you’ll notice with moneyline odds is that there is either a positive or negative sign in front of the number. What that sign denotes is how much you’ll win betting on each side. If there’s a positive sign next to the odds, that indicates the amount of money you would win if you bet $100. If the odds on a tennis player said +150, that means that for a $100 bet, you would win $150. Now if there is a minus sign in front of the odds, that is the number that you would have to bet in order to win $100. For example, if a football team was -250, that means you’d have to bet $250 to win $100.
A sharp bettor is viewed as a professional in the world of sports betting. Even the best bettors over time are not going to win more than in the mid-50 percent range, with general public losing more than they win. A sharp bettor is viewed as someone who has a proven record of success, and so when they place a bet on a game, a sportsbook will suspect they know something the general public might not. The point spread can change with a large amount of public money bet on a game, but it can also move with a smaller bet by sharps.

The 3-digit numbers to the far right are the listed prices for these bets.  This is also called the odds, vig, or juice.  An easy way to think of it is the amount you must risk to win $100 on this wager.  In our example, -110 means you must risk $110 if you want to win $100.  -110 is pretty standard, but you will find different options.  We will cover those in more depth when we talk about money lines.  The price of the bet has no impact on which team is favored.  Only the plus or minus on the point spread matters.  This is handled differently when you bet strictly on the moneyline.
Total: Also called the over/under, it is a number set by the sportsbooks that proposes a number of points that will be scored in the game by both teams combined. Then, fans predict whether there will be more points or less points than the ‘total.’ If you bet the under 41.5, you are hoping for a tough defensive battle with lots of running game. Pick the over, and presumably you feel this will be a high-scoring game. In short, you are predicting whether the combined total score will be more than (over) or less than (under) the total.
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