A point spread (or line) is a tool used by sportsbooks to attract wagers on both sides of a game. The line is most commonly used in football and basketball games. Because it’s rare for two teams in a pro sports game to be completely evenly-matched, one team will have an advantage, another will be seen as the underdog. The point spread is the handicap offered to the underdog to level the playing field, so to speak.
Is that each game will have a favorite and an underdog. Even in contests where it’s a toss-up, the sportsbook will select someone as the favorite and the underdog for betting purposes. Depending on how big of a favorite or underdog the team or player is, the payout will be adjusted. The bigger the favorite, the smaller the payout. The bigger the underdog, the larger the payout.
Another form of futures betting involves the over/under on the number of games a particular team will win in the regular season. This type of wager is typically found on pro football and major league baseball, and sometimes on pro basketball. For example, the over/under on the Yankees may be 93 wins. If the Yankees go on to win 94 or more games, the "over" is a winner. If they win 92 or fewer games, the "under" is a winner. If they win exactly 93, the bet is a push and tickets are refunded.

For example, imagine a game where the odds were -550 for the favorite and +450 for the underdog. A bettor shopping around for lines might be delighted to see the same favorite offered at -490 and enthusiastically back the team at those odds simply because those are the best odds available. However, if we removed the vig from -550 and +450, we'd see that the fair odds are actually -466 and +466. So, placing a wager at odds of -490 doesn't actually offer any value.
As you might guess, you’re mainly going to see American odds in American sportsbooks. The other two formats are much more prominent in Europe and Asia. If you’re betting online, most sportsbooks give you the ability to change all of the odds on the site into the format that you prefer. No format is different regarding payouts; it’s just a different way of presenting the information.
Below we have also put together an infographic explaining all of the information on this page. This is a useful tool for someone who wants to see a visual explanation of how to calculate your payouts when using moneyline odds in your betting. You can save this graphic for your own personal use or use the embed feature to put it up and share with others.
The point spread, which is sometimes referred to as the “handicap”, is the number of points taken from the favorite, or given to the underdog, in order to open up the chances of either team winning the wager evenly. In most games, there’s usually a team that is more likely to win, based on a number of statistical factors. If the only kind of wager available was on who would win between a very strong team and a poor team, it wouldn’t be all that exciting. The point spread was designed to make betting much more interesting, since it allows a bet on the losing team to win you money. How? Let’s break down an example: