In betting, +/- odds are part of the American odds format. A + sign indicates how much profit you make on a $100 bet, while a - sign shows how much you need to bet to win $100. For example, -150 means you need to bet $150 to win $100, and +200 means a $100 bet will yield $200 in profit. These odds are commonly used by betting agents and betting brokerage services, including spread betting brokers.