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NFL Passer Rating Formula:
The NFL's current passer rating (also known as quarterback rating) system was conceived by Pro Football Hall of Fame's retired vice president Don Smith in 1973. The system is a sliding scale fees/sliding scale design, where outstanding performances meet diminishing returns faster than sub-par ones. The best passer rating that a quarterback can obtain is 158.3, while the worst is zero. The architects of the passer rating had 66 =/<sub>3</sub> in mind as the average score, but as styles of play have changed, so have average passer ratings. The cumulative league-wide average passer rating for the years 2000 through 2003, all inclusive, was 78.9 (the figure is typically rounded to the nearest 1/10 of a point); however in 2004 the league average was 82.8. In 2007, the average was 83.5.
Calculation:
Passer rating is determined by four statistical components, each of which is computed as a number between zero and 2.375. The benchmarks for these statistics are based on historical averages. If any of the raw components are beyond the limits of zero or 2.375, the component is set to limiting value of zero or 2.375 as the case may be.
C, completion percentage is calculated : comp / att x 100 - 30 / 20
Y, yards per attempt is calculated : (yds / att - 3) x 1 / 4
T, touchdowns per attempt is calculated : td / att x 20
I, interceptions per attempt is calculated : 2.375 - ( int / att x 25)
The four components are then added, divided by 6 and multiplied by 100
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