This is because bookmakers are in business to make a profit, so they effectively charge a commission for taking wagers. This commission is known as the vig, short for vigorish, and it's one of the ways that bookmakers stay profitable. They don't charge it just for points spreads and totals either, as it's built into the odds for every wager that they offer.
There are also half bets, which are a wager placed on the odds posted for the first half or second half of a football game only.  All halftime wagers are calculated the same as a straight wager.  Another type of bet is a parlay which is a selection of 2 or more teams.  All teams wagered on in a parlay must win. If there is a tie on any bet you would be paid out on the next payoff.  For example, if you had a 5 team parlay and two teams tied, you would then be paid on a three team parlay if all the other teams won.  Another type of football bet is called a teaser, which is a selection of two or more teams in one wager in which the point spread is adjusted in your favor. The number of football teams selected and the number of points selected determines the odds for payout.
Ideally, the lines I release will balance the action equally, so that the winners get paid out from the pockets of the losers and we take the vigorish. That’s an ideal that rarely happens – especially in sports without a pointspread, like NASCAR and golf. If Team A is getting too much action, I’ll move the line toward Team B to try to achieve that balance. My personal preference is to tweak the vig from –110 to –105 or +100 before taking the bigger step of moving the spread a half-point or more. 

If you've ever said the words "best two out of three" when playing a game amongst friends, you are subconsciously making a "series bet." You are betting that during the course of these three games that you will be able to win two games thus emerging victorious. In the sports betting industry, a "series bet" is a betting option that allows you to correctly predict which team will win more games in a particular series and ultimately advance to the next round instead of deciding who will win each individual game. Read More >>
For reading the fraction odds, I strongly recommend converting them to a decimal. This will make figuring out your potential win much much easier! To do this, just like in 2nd grade, you take the first number and divide it by the second. So if your odds read 7/4, you simply divide (7) by (4), which equals 1.75. That is the decimal form odds, now you simply multiply (1.75) by whatever your wager amount is to figure out your potential profit. In this case, if you were to risk $100, then your potential win would be $175 profit if you are correct! Also, you will receive your initial bet amount of $100 as well, for a total of $275 in your hand.

What may look like a jumble of words, numbers, and punctuation is actually a precise and easy-to-read breakdown of the various odds and point spread details your book is offering. Here is a breakdown of each unit of information given above. Once you understand each part of the jumbled details above, you’ll be able to read a sports betting line with confidence.
If you aspire to become an avid bettor and are serious about learning the trade, the first thing I recommend doing is to come up with several angles and legitimate reasons why betting on a specific team is going to make you money. I understand that angles and reasoning can only take you so far before what happens on the court or field is out of your control but playing the angles is a key part of sports betting that isn't going away any time soon. One of the better angles I look to play is a bet called the First Half Bet. Read More >>

Like many high scoring sports, NFL wagering is dictated by the point spread. The spread, or line, is a type of side bet that equalizes the chance of winning a wager. The line offered for any given team will be accompanied with a – or + symbol to indicate whether a team is a favorite or an underdog. The example below displays the spread from the Sports Insights archives at the time of kickoff:

Understanding NFL betting lines is just the first step towards making profits with football wagering. Once you've got the basics down, it's important to continue learning sports betting strategy to improve your long-term chances of winning. If you're able to win more than 52.4% of the time, you'll be well on your way towards being a profitable NFL bettor.
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For starters, you will need somewhere to place bets.  If you are in Vegas, great!  You can bet at one of the sportsbooks in their casinos.  As more and more states pass laws to legalize sports betting, you will also be able to place wagers at local casinos in your area.  You could also find a local bookie to bet through, but we recommend betting online.

Point Spread: The point spread remains the favorite way to wager on pro football, regardless of how many new forms of wagering come on stream. It’s called the line or spread and it’s known as betting ‘sides.’ The common misconception is that Las Vegas sets the spread as its best guess at the margin of victory. But really, it's a number they feel that is a perfect balance and will see an equal number of people to bet the underdog as on the favorite. A negative value like -6.5 means that team is favored by 6.5 points. So deduct 6.5 points from their total score. A positive value on the same game would be +6.5 (add 6.5 points to their final score) and would make that team an underdog of 6.5 points. The favorite must win by at least seven points to cover the spread. The underdog can lose by six points and still cover.