In sports betting, odds are the implied probability of an event happening and how much an individual would stand to get from a successful wager. In most cases, they come in a decimal format. However, they are found in fractional or American odds. Usually, at their beginning, the American odds come with either a positive or a negative sign before a number. The positive number, for example, +150, shows how much money a $100 bet would win, while the negative one, -150, shows how much you would have to bet to win $100.