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Definition – What is “Passer Rating” in the CFL?
Passer rating is a tackle football statistic that is used to evaluate a quarterback’s passing performance in the CFL.
It is intended to mix some different indicators into one “aggregate” rating to show a quarterback’s overall passing performance.
Passer Rating as a measurement of a quarterback’s effectiveness was implemented in the 1970s.
The system was developed by the NFL’s statistical committee to replace an existing system that ranked a quarterback’s performance relative to their peers. It was later adopted by the CFL.
Formula – How to calculate passer rating
In the CFL, passer rating is calculated as follows:
a = ((completions ÷ passing attempts) – 0.3) x 5
b = ((passing yards ÷ passing attempts) – 3) x 0.25
c = (touchdown passes ÷ passing attempts) x 20
d = 2.375 – ((interceptions ÷ passing attempts) x 25)
If any of a, b, c, or d are less than ‘0’, then they calculated as 0.
If any of a,b,c, or d are more than 2.375, then they are calculated as 2.375.
Passer Rating = ((a + b + c + d) ÷ 6) x 100
Example
If a quarterback has made 659 passing attempts and in that time has 450 completions, has passed for 5,477 yards, made 55 touchdown passes, and has had 10 interceptions, then:
a = ((450 ÷ 659) – 0.3) x 5 = 1.914
b = ((5,477 ÷ 659) – 3) x 0.25 = 1.328
c = (55 ÷ 659) x 20 = 1.669
d = 2.375 – ((10 ÷ 659) x 25) = 1.996
Passer Rating = ((1.914 + 1.328 + 1.669 + 1.996) ÷ 6) x 100
Passer Rating = 115.12
Therefore, the quarterback’s passer rating is 115.12
Sources and more resources
- NFL – Quarterback Rating Formula (via Archive.org) – The official write-up on passer rating. The CFL uses the same formula as the NFL.
- Wikipedia – Passer Rating, Quarterback, and Gridiron Football (North American Football) – Wikipedia’s entries on passer rating, football, and the quarterback position.
- Passer ratings from the CFL (passer rating is “EFFIC”), TSN (passer rating is “RTG”), and MSN (passer rating is “RATING”).