By John Turney
The formula was meant to even out or make the four major passing statistics "about even" according to Former Pro Football Hall of Fame executive Don Smith who headed the committee in 1972 that developed the formula.
The four major categories were completion percentage, average gain per attempt, touchdown percentage and interception percentage.
Those categories were also given a minimum and a maximum.
Those were for completion percentage—min = 30.0% and max = 77.5%
Average gain—min = 3.0 and max = 12.50
Touchdown percentage—min = 0.0% and max = 11.9%
Interception percentage—min = 0.0 and max = 9.5%
So, if a passer maxes out on all for he gets the "perfect"rating of 158.3.
For players with 15 or more passing attempts, there are current 51 performances of 158.3.
However, when one takes out the limits, the list changes significantly. So, we did that. Hat tip to Pro Football Reference.com for the inital list. We then removed the limits and listed them under "Actual" rating.
The bolded players have the 158.3 max rating. The others, have a rating of less than 158.3 but
with the limits removed they surpass many of the perfect ratings.
Norm Van Brocklin has the highest for 15 or more attempts
Lamar Jackson has the highest for 20 or more attempts
Aaron Rodgers has the best 'unlimited' passer rating for 30 or more attempts
Here is the top 99 passer ratings for players with 15 or more attempts in a game.