The main goal for each sportsbook is to set the best line possible in order to create even action on both sides of the game. In a perfect world, the book would have 50 percent of the handle come in on the favorite and 50 percent of the action come in on the underdog. If this happens, the sportsbook would be guaranteed a profit because of the 10 percent vig they charge on most point spread wagers. When a book has serious one-sided action, they will attempt to counter that by moving the line in the direction that's taking the most money and try to entice bettors into betting on the other side.

For beginning sports gamblers, moneylines (sometimes called money lines or American odds) can be confusing. Unlike point spreads, which are concerned with who wins and by how much, a moneyline is solely dependent upon who wins. Moneylines are used most commonly in low-scoring games like baseball or hockey, but they may also be used in boxing and other sports.


In most cases, the favorite will be the team with a negative moneyline (in some cases both teams can have a negative moneyline if they are both closely matched). A line of -160 means that you would have to bet $160 to win your base amount of $100. A team with a moneyline of -130 wouldn't be favored nearly as strongly as a team with a moneyline of -330.
The betting public as a whole is not very smart. There is a reason it is such a lucrative business to be in for the sportsbooks. The public loves to bet popular teams, great story lines, and trends that don't have a lot of merits. If you think that the public is going to bet a lot and shift the line more in your favor, just wait. In these situations, the worst that might happen is the line doesn't move, and you then take the bet right before the game at the original line that you still thought had value. Yes, there is a possibility of the point spread moving the other direction. If this happens, you just don't make a bet on this game and wait for the next one.
It’s common knowledge among bettors that the online gambling industry pays close attention to Las Vegas Sports Consultants, a private company that handles the odds for casinos and newspapers. But the totals I set have to reflect our customers’ preferences for betting the over or under on certain teams in certain situations. Also, because LVSC lines are published early, I have to keep on top of injuries and potential changes in coaching strategy leading up to the game in question before I release any totals. This is doubly important in basketball, where pace determines how many shots will be taken in 48 minutes.

In our earlier example, the sportsbook would be devastated if 100% of the action came in on the Falcons. The book is not looking to gamble; they are looking for a sure thing. So, to try and entice more people to bet on the Bear Cubs and discourage people from betting on the Falcons, they will alter the payouts. They will make the amount you win for correctly selecting the Bear Cubs much larger and the amount that you win for correctly selecting the Falcons much smaller.
Here you can see that the Rams are +3.5, while the Cowboys are -3.5.  So for this example the Cowboys are 3.5 point favorites, while the Rams are underdogs of 3.5 points.  If you were to bet on St Louis you would need them to lose by 3 or fewer points or just win the game outright.  If you were to bet on Dallas you would need the Cowboys to win by 4 or more points.
The -110 on either side is like paying a tax or commission to the sportsbook. Bettors would pay 10 percent (aka juice) to the sportsbook, which is essentially a fee for brokering the wager. So, the -110 indicates that a bettor must risk $110 to win $100. Some sportsbooks will even reduce the juice for you which means you can earn the same $100 payout but risk less money to do it.
In most cases, the favorite will be the team with a negative moneyline (in some cases both teams can have a negative moneyline if they are both closely matched). A line of -160 means that you would have to bet $160 to win your base amount of $100. A team with a moneyline of -130 wouldn't be favored nearly as strongly as a team with a moneyline of -330.
You’ll need to know how the rotation number, point spread, moneyline and over/under are used and what each means. Each of these terms may be called by another name. The rotation number if often referred to as the number or the rotation mark, moneyline becomes line, point spread is called the spread, and over/under becomes the total. When you come down to it, these are the major terms that can be lumped under the heading odds.
You may have noticed that we said earlier that it’s the amount of money bet on each side that is important to the sportsbook and not the number of bets. This is an important distinction to understand. If 100 people bet $10 on Team A, and then one person bets $10,000 on Team B, the line is going to shift to attract action onto Team A. Even though more people bet on Team A, more actual money came in on Team B.
In cases when there is a point spread and moneyline offered on an event, such as an NFL football game, many bettors will place a wager on the moneyline and point spread of an underdog they feel has a chance to pull the upset. They will safely bet the point spread because they feel the game will be close, but will also put themselves in line for a nice payday if the underdog wins straight-up.
Some people consider sports gambling a disease which is why it is outlawed everywhere in the United States besides Las Vegas. However, many Americans still bet on sports illegally with various overseas bookies. Because of this, many Americans believe sports gambling should be made legal throughout the United States because the country is missing out on millions of potential tax dollars by sports gamblers using overseas bookies.
If the Cowboys are 6-point favorites, their odds are -6. If the Giants are 6-point underdogs, their odds are +6. From the oddsmakers' perspective, the Giants are starting the game with a 6-0 lead, while from the Dallas side, the Cowboys are starting with a 0-6 deficit. If you bet on the Cowboys and they win 34-30, they failed to cover the spread by two points. If you bet on the Giants, they beat the spread by two points.
A point spread in sports is a figure set by oddsmakers to provide an advantage or disadvantage based on the margin of victory or defeat for a given team. The “favorite” team (labeled with a “-” sign) would be at the disadvantage as they would need to win the game by a set number of points while the “underdog” team (labeled with a “+” sign) would be given an advantage to not lose the game by a set number of points. The reason oddsmakers do this is to provide betting interest for both sides due to one team typically being better than the other.
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