American Moneylines: Example odds: -300 vs +270. The +270 bet would yield $270 in profit for every $100 bet. That means you will get back $370 total if you win your $100 bet. -300 means you need to bet $300 to profit $100. You will get $400 back total. Therefore “-” means favorite and “+” means underdog. Decimal Odds: The above example would translate into 3.70. The decimal system is easy to understand, take whatever your stake is times the odds = total winnings. $100 * 3.70 = $370. British Odds: Bet the right number to win the left number. For example 1/4, means you bet $4 and profit $1 if you hit it($5 back total).