If you are asking what % of the time you have to win to break even betting -120, the answer is 54.5%.
If you are asking what % chance the market thinks that particular team has of winning that game, you would have to calculate the no-vig line. Assuming 10 cent lines, the market thinks that team has a 53.4% chance of winning.
If you are asking what % chance the market thinks that particular team has of winning that game, you would have to calculate the no-vig line. Assuming 10 cent lines, the market thinks that team has a 53.4% chance of winning.
