A perfect quarterback rating in the NFL is 158.3.   You know how a perfect wine rating is 100? Well, wouldn't it make more sense to have a perfect QB rating be 100.  I mean, 158.3 is a pretty weird number.

Here is the gobbledygook from which the rating is derived:  (This is from Wikipedia) - If you get to the bottom of this without getting a headache then you are either a true football fan, a geek, a math genius, or seriously mentally ill.

"The NFL passer rating formula includes four variables: completion percentage, yards per attempt, touchdowns per attempt, and interceptions per attempt. Each of those variables is scaled to a value between 0 and 2.375, with 1.0 being statistically average (based on league data between 1960–1970). When the formula was first created, a 66.7 rating indicated an average performance, and a 100+ rating indicated an excellent performance. However, passing performance has improved steadily since then and in 2017 the league average rating was 88.6.

The four separate calculations can be expressed in the following equations:    where

<dl><dd>ATT = Number of passing attempts</dd><dd>COMP = Number of completions</dd><dd>YDS = Passing yards</dd><dd>TD = Touchdown passes</dd><dd>INT = Interceptions</dd></dl>

If the result of any calculation is greater than 2.375, it is set to 2.375. If the result is a negative number, it is set to zero.

Then, the above calculations are used to complete the passer rating: A perfect passer rating (158.3) requires at least:A minimum rating (0.0) requires at best:

77.5% completion percentage
12.5 yards per attempt
11.875% TD/ATT (1 TD/8.421ATT)
No interceptions

30.0% completion percentage
3.0 yards per attempt
No touchdowns
9.5% INT/ATT (1INT/10.526ATT)

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