For all the talk of new forms of wagering, the good old point spread remains the bet of choice for most NFL fans. Also known as the line or spread, the myth is that Las Vegas sets the point spread as its predicted margin of victory for one team. In reality, it's a number chosen by oddsmakers that will encourage an equal number of people to wager on the underdog as on the favorite. The negative value (-3.5) indicates that team is favored by 3.5 points. The positive value (+3.5) indicates that team is the underdog by 3.5 points. Betting on the favorite means the team must win by at least four points to cover the point spread. The underdog team can lose by three points and still cover the spread. You will also notice a moneyline value associated with the point spread (such as -3.5, -115). This indicates how much you must risk in order to book the bet (also known as the vig or juice). It means you have to risk $115 to win $100. The underdog may see a value such as +3.5, +105. This means you risk $100 to win $105 if your team covers the spread. The spread is not a static number, so you will notice line moves during the week. Team A may be favored by 3 points on Tuesday and by 4.5 points on Friday. This indicates more people are betting on them, so Las Vegas increases the underdog value hoping to encourage more wagers on the underdog.
Money Line: More common in baseball and hockey, pro football moneylines are growing in popularity. There is no spread, so your team just needs to win the game, not win by a certain number of points. The negative value means a favorite (-190) and a positive one indicates an underdog (+170). Picture the number 100 sitting in between these two values. Example: if you want to pick a -190 favorite, you must risk $190 in order to win $100. To back a +170 underdog, you put up $100 and win $170 if the dog wins. In some cases, betting moneylines is actually better value and can provide a bigger profit for less risk.