According to cbs sports, they measure how many 4 and 5 stars a team has. In simple terms: To win the national championship, college football teams need to sign more four- and five-star recruits (AKA "Blue Chips") than two- and three-star players over the previous four recruiting classes.
Ohio State 90%
Alabama 88%
Georgia 80%
Texas A&M 79%
Oregon 76%
If you’re wondering, scUM is at 56%.