Apply the spread. In point-spread betting, the actual final score of the game is only the starting point. Say Chicago beats Detroit 24-17. Because Chicago was the favorite, you subtract the point spread from its final score. That's the purpose of the minus sign in the spread. The spread was 6, so you take 6 points away from Chicago's point total, giving you an "adjusted" score of Chicago 18, Detroit 17. If you'd bet on Chicago, you'd have won the bet. Now, say Chicago won the game 20-17. Subtracting the 6 points from Chicago's total gives you a final score of Detroit 17, Chicago 14. If you'd bet on Chicago, you'd have lost.
Jeff Gordon has been reporting and writing since 1977. His most recent work has appeared on websites such as eHow, GolfLink, Ask Men, Open Sports, Fox Sports and MSN. He has previously written for publications such as "The Sporting News" and "The Hockey News." He graduated from the University of Missouri-Columbia School of Journalism in 1979 with a bachelor's degree.
But what if the basement-dweller team was spotted 24 points? That's the concept behind the point spread. When two teams meet on the football field or a basketball court, one team is typically better than the other. If all bettors had to do was to pick the winning team, everybody would simply wager on the best team and collect their money. Gambling institutions, sportsbooks, and bookies would soon go broke. 
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.
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.
The -110 listed is the actual odds given for these bets, and the odds determine how much you win based on the amount of your wager. This is why the odds are often called the price of a bet. When you see -110 odds, you need to bet $110 to win $100. Of course, you don't need to literally bet $110; that is just the ratio of the amount bet to the amount won. You can bet $11 to win $10, $20 to win $18.18, etc.
Here at The Football Lines .com on our point spread page we provide the latest NFL point spread lines for the current NFL week for your informational purposes only. These include the opening NFL point spread and current line which is updated regularly throughout the week, with our aim being to provide all the NFL spread details you need both current and historical in an easy to access format. The Football Lines .com's previous seasons Historical NFL Point Spreads section provides detailed week by week opening and closing NFL spread lines dating back to the 2007 season. With the current seasons week at the top and working your way down through the previous football years data you quickly have access to the final score, open and close NFL spread lines to see how many points it moved as well as color coded display of the spread winner.
Parlays - these might be the most popular bets out there, especially among novice and amateur bettors, perhaps because of the lure of betting a small amount for a potentially big payoff. But they are fool's gold at best. Parlays involve wagering on two or more games on the same bet following the casino's pre-determined payout scale. Each game on a parlay must win for the bet to be a winner.
If you wanted to place a $10 wager on the USA at 2.40 you would simply need to multiply your $10 wager by the 2.40 odds (10 x 2.40) to find out that the payout is $24. It is important to realize that with decimal style odds it includes the amount you wagered, so to find out profits you would need to subtract your wager ($24 – $10) to find out your potential payout is $14 in profits.
The true purpose of a pointspread when it is released by any sportsbook is to try and attract an equal amount of betting action on either side of a matchup. If all the early money is flooding in on New England as the favorite with a seven point spread, the betting outlet handling this action is likely to move that betting spread to 7.5 points to try and attract some money towards Miami as the underdog.
Several factors influence a point spread. It starts with power rankings. The media creates power rankings throughout the year, but those can be entirely subjective based more on feelings and emotions than actual raw data. An oddsmaker creates power rankings based on a host of statistics, some more complex than others. The rankings will include record, strength of schedule, and various offensive, defensive, and special teams metrics. They might use Football Outsiders’ efficiency metrics, they might use expected points added, or they might use a host of other internal and external options. The idea being to develop as objective an assessment as possible as to how good or bad a given team is compared to the rest of the NFL.
The optimal situation for bookmakers is to set odds that will attract an equal amount of money on both sides, thus limiting their exposure to any one particular result. To further explain, consider two people make a bet on each side of a game without a bookmaker. Each risks $110, meaning there is $220 to be won. The winner of that bet will receive all $220. However, if he had made that $110 bet through a bookmaker he would have only won $100 because of the vig. In a perfect world if all bookmaker action was balanced, they would be guaranteed a nice profit because of the vig.
Once you have selected the appropriate sport, league and game, the betting options appear. A betting option is, for example, the winner of a game, how many goals will fall or how many fouls, penalties, corners and free kicks there will be. For football matches in the first leagues, there are usually around 40,000 different betting options available for almost every country. The large offer may seem deterrent, but the betting providers solve the problem with a very good overview as well as a function to find the desired betting option quickly and easily. There's a odds on every betting option. This number indicates how likely a betting option is. If the odds are high, the profit margin is also high, but the probability of the event occurring is very low. An example of this would be if a third division team won against a first division team. If the rate is low, the event is very likely. So in terms of the example that the favorite will win the game. The process of a bet reads longer than it is. After the first bets, the process has already turned into flesh and blood and you can place betting options every minute. Of course, only if you have informed yourself about sports and betting in detail beforehand, because this is the only way to make sports betting with responsibility and a good chance of success possible. Find out more on Livewetten
The concept of betting on totals, or Over/Under (O/U), is quite simplistic. The bettor wagers on whether the TOTAL points scored in a game will fall over or under a pre-determined number set by the sportsbook. Much like the point spread, game totals can be swayed by public opinion. The example below, from the SI Archive, shows the opening totals line for Superbowl XLV:

The point spread will list one team in the negative and the other in the positive. (Unless neither team is favored, then they will be listed as EVEN or PICK). The club posted in the negative with a minus sign is favored and so the bookies take points away from them, which means that team must win by at least a certain number of points to cover the spread. The underdog will have a plus sign and will cover if they win outright or lose by less than the posted number.

Teasers are similar to parlays except the point spread on each game moves a certain number of points in the player's favor. In football the player gets 6 to 7 points, and in basketball, 4 to 5 points. The player pays for this in the form of much lower winnings. For example, if the Vikings were part of a 6-point teaser, then they would only need to win by more than 4 points to cover. If the Rams were part of a teaser, they could win, or lose by less than 16, and cover.
NFL odds do not stop at the point spread and OVER/UNDER. There are numerous ways to bet on football these days, including the NFL moneyline, futures (odds to win the Super Bowl), and first-half and second-half betting lines. Throw in fun fantasy-style prop bets (will Tom Brady throw for 300+ yards this week) and live NFL betting (where you can wager on the next play and on odds that change all game long) and the importance of understanding how NFL odds work has never been greater. Check out the lines and bookmark for more updates and football lines enhancements in the coming weeks and months.
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