Total QBR is a quarterback rating that takes into account all of a quarterback's contributions (passing, rushing, sacks, fumbles, penalties) to his team's scoring and winning and summarizes them into one number on a 0-100 scale, on which 50 is average.For a game, the number can be interpreted as a percentile, so a score of 80 means a quarterback's performance was better than 80 percent of all quarterbacks' games. For more about the methodology and statistics behind the Total QBR, see here.