As stated, a negative number means the bookie sees the outcome as more likely. The number gives you how much you would need to bet to win $100 in profit. A positive number indicates the underdog. The number shown in the betting odds tells you how much you would win if you bet $100.

What do odds of +200 mean?

Getting odds at +200 can be extremely valuable if you are able to win the bet. For example, if you were to place a bet of $100 on a team with odds at +200 you would win $200 for that play. You would also get your $100 bet back, meaning that $300 would go back into your account.

How are odds calculated in Vegas?

To calculate winnings on fractional odds, multiply your bet by the top number (numerator), then divide the result by the bottom (denominator). So a $10 bet at 5/2 odds is (10 * 5) / 2, which equals $25. A $10 bet at 2/5 odds is (10 * 2) / 5, which is $4.