The NFL Passer Rating or Quarterback Rating Forumula is a measure of the performance of quarterbacks or any other passers in the NFL. There are at least two calculations currently in use: one officially used by the National Football League and the Canadian Football League, and one used in college football. The NFL Passer Rating, shown below, is calculated from four components using each quarterback's following stats:
(1) completion percentage (completions per attempts),
(2) passing yardage (yards per attempts),
(3) touchdowns per attempts and
(4) interceptions
The NFL's current "passer rating" system was conceived by Pro Football Hall of Fame's Don Smith in 1973.
C = Completion Percentage ((Completions/Attempts) x 100 - 30)/20 ====> ((324/461) x 100 - 30)/20)
Y = Passing Yardage or Yards per Attempts (Yards/Attempts) - 3) x .25 ====> ((3,969/461 - 3) x .25
T = Touchdowns per Attempts (Touchdowns/Attempts) x 20 ====> ((35/461) x 20)
I = Interceptions per Attempt 2.375 - (Interceptions/Attempts) x 25 ====> (2.375 - (10/461) x 25
The four components are combined in the following formula:
((C + Y + T + I) / 6) x 100
Here is Steve Young's 1994 performance shown for each component:
Since each component of the passer rating can be no greater than 2.375,
the maximum passer rating is
158.333
(below): To achieve a maximum Passer Rating of 158.333, a quarterback must achieve the following: Completion Category: A completion percentage greater than or equal to 77.5 % Yards per Attempts Category: Greater than or equal to 12.5 yards per attempt Touchdowns per Attempts: Greater than or equal to .11875 touchdowns per attempt. In other words, no more than 8.42 attempts per touchdown.
Interceptions per Attempt: Zero interceptions allowed.
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*Some calculations may not be appropriate for certain individuals. This site is intended for use as an educational tool, not a clinical tool. Always check with your physician before starting an exercise program.