How does the -/+ thing work in odds making?
American odds:
Moneyline odds are favoured by American bookmakers. The figure quoted is either positive or negative.
When moneyline odds are positive, the figure indicates how much money will be won on a $100 wager (this is done for an outcome that is considered less likely to happen than not). For example, a net payout of 4/1 would be quoted as +400.
When moneyline odds are negative, the figure indicates how much money must be wagered to win $100 (this is done for an outcome is considered more likely to happen than not). For example, a net payout of 1/4 would be quoted as -400.
Moneyline odds are often referred to as American odds. Moneyline refers to odds on the straight-up outcome of a game with no consideration to a point spread. The favorite will have negative moneyline odds (less payoff for a safer bet) and the underdog will have positive moneyline odds (more payoff for a risky bet)
