Odds represent the likelihood of an outcome. In sports betting, each team is assigned odds — assigned by a sportsbook — that represent the likelihood of its winning the game. In a betting line between two teams, the team expected to win is called the favorite. The team expected to lose the game is called the underdog.
Sports betting odds are created by bookmakers to show what the outcome of a game or event is likely to be. They also dictate how much profit a player can make when betting on an event at that sportsbook. They're often heavily influenced by Vegas odds, football in particular.
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Betting odds simply indicate the likelihood of an event and the return you’d get if you did make a wager on the result. Betting odds may be displayed in three different formats at US sportsbooks and online and mobile sports betting platforms: American odds, fractional odds and decimal odds.
A fractional listing of 6/1 (six-to-one) odds would mean that you win $6 against every $1 you wager, in addition to receiving your dollar back (i.e., the amount you wagered).
American Odds in a Nutshell. American odds are expressed as three-digit numbers preceded by a plus (+) or minus (-), indicating whether you are betting on the favorite or underdog and how much you ought to bet to win $100.
The American Odds have two components to them, the first being the positive or negative sign, and the second being the number that follows the sign. The sign in front of the number indicates whether placing a wager on that outcome will pay out more money then you have wagered or less money then you have wagered.
Sometimes referred to as ‘totals’ betting, over/under odds are a bet on the total combined score in a game. It doesn’t matter who wins or loses. Instead, the bet depends on whether the combined amount is over or under a predetermined number set by the bookmaker.
Anytime you see odds with a minus in front of it, take the number and that is what you would need to bet in order to win $100 in profit. So, a -450 number would mean that you would have to bet $450 in order to win $100 in profit back. On the other hand, an odds number with a "plus" in front of it means that the team or player is an underdog.