The QB rating is a measure of the performance of a quarterback in the NFL and CFL.  The QB rating is calculated using each quarterback’s completion percentage, passing yardage, touchdowns and interceptions. 

On any particular game, a quarterback could have a rating of between 0 and 158.3.  158.3!!!  WHAT THE HELL!?!?  I try to explain it in this post.  However, the idiosyncrasies of how the formula was historically determined will not be in this post.      

The basics and the math:-

There are four (4) components, as mentioned above, by which the QB rating is calculated:

C: Percentage of completions per attempt = ([Completions/Attempts]*100 – 30)/20
Y: Average yards gained per attempt=  ([Yards/Attempts] – 3)/4
T: Percentage of touchdown passes per attempt = [Touchdowns/Attempts]*20
I:  Percentage of interceptions per attempt = (2.375 – [Interceptions/Attempts]*25)

Q = (C+Y+T+I)*100/6

This value does not reflect leadership, play-calling, and other intangible factors that go into making a successful professional quarterback.  Look at the World Champion QB Ben Rothlisberger’s stats – – – 80.1.  I just find it interesting.

From 2008:-

Name/Title Comp Att Yds TD Int Comp % Rating TD % Int % YPA
1. Philip Rivers, San Diego Chargers 312 478 4009 34 11 65.3% 105.5 7.1% 2.3% 8.39
2. Chad Pennington, Miami Dolphins 321 476 3653 19 7 67.4% 97.4 4.0% 1.5% 7.67
3. Kurt Warner, Arizona Cardinals 401 598 4583 30 14 67.1% 96.9 5.0% 2.3% 7.66
4. Drew Brees, New Orleans Saints 413 635 5069 34 17 65.0% 96.2 5.4% 2.7% 7.98
5. Peyton Manning, Indianapolis Colts 371 555 4002 27 12 66.8% 95.0 4.9% 2.2% 7.21
6. Aaron Rodgers, Green Bay Packers 341 536 4038 28 13 63.6% 93.8 5.2% 2.4% 7.53
7. Matt Schaub, Houston Texans 251 380 3043 15 10 66.1% 92.7 3.9% 2.6% 8.01
8. Tony Romo, Dallas Cowboys 276 450 3448 26 14 61.3% 91.4 5.8% 3.1% 7.66
9. Jeff Garcia, Tampa Bay Buccaneers 244 376 2712 12 6 64.9% 90.2 3.2% 1.6% 7.21
10. Matt Cassel, New England Patriots 327 516 3693 21 11 63.4% 89.4 4.1% 2.1% 7.16
11. Matt Ryan, Atlanta Falcons 265 434 3440 16 11 61.1% 87.7 3.7% 2.5% 7.93
12. Shaun Hill, San Francisco 49ers 181 288 2046 13 8 62.8% 87.5 4.5% 2.8% 7.10
13. Seneca Wallace, Seattle Seahawks 141 242 1532 11 3 58.3% 87.0 4.5% 1.2% 6.33
14. Eli Manning, New York Giants 289 479 3238 21 10 60.3% 86.4 4.4% 2.1% 6.76
15. Donovan McNabb, Philadelphia Eagles 345 571 3916 23 11 60.4% 86.4 4.0% 1.9% 6.86
16. Jay Cutler, Denver Broncos 384 616 4526 25 18 62.3% 86.0 4.1% 2.9% 7.35
17. Trent Edwards, Buffalo Bills 245 374 2699 11 10 65.5% 85.4 2.9% 2.7% 7.22
18. Jake Delhomme, Carolina Panthers 246 414 3288 15 12 59.4% 84.7 3.6% 2.9% 7.94
19. Jason Campbell, Washington Redskins 315 506 3245 13 6 62.3% 84.3 2.6% 1.2% 6.41
20. David Garrard, Jacksonville Jaguars 335 535 3620 15 13 62.6% 81.7 2.8% 2.4% 6.77
21. Brett Favre, New York Jets 343 522 3472 22 22 65.7% 81.0 4.2% 4.2% 6.65
22. Joe Flacco, Baltimore Ravens 257 428 2971 14 12 60.0% 80.3 3.3% 2.8% 6.94
23. Kerry Collins, Tennessee Titans 242 415 2676 12 7 58.3% 80.2 2.9% 1.7% 6.45
24. Ben Roethlisberger, Pittsburgh Steelers 281 469 3301 17 15 59.9% 80.1 3.6% 3.2% 7.04
25. Kyle Orton, Chicago Bears 272 465 2972 18 12 58.5% 79.6 3.9% 2.6% 6.39
26. JaMarcus Russell, Oakland Raiders 198 368 2423 13 8 53.8% 77.1 3.5% 2.2% 6.58
27. Tyler Thigpen, Kansas City Chiefs 230 420 2608 18 12 54.8% 76.0 4.3% 2.9% 6.21
28. Gus Frerotte, Minnesota Vikings 178 301 2157 12 15 59.1% 73.7 4.0% 5.0% 7.17
29. Dan Orlovsky, Detroit Lions 143 255 1616 8 8 56.1% 72.6 3.1% 3.1% 6.34
30. Marc Bulger, St. Louis Rams 251 440 2720 11 13 57.0% 71.4 2.5% 3.0% 6.18
31. Ryan Fitzpatrick, Cincinnati Bengals 221 372 1905 8 9 59.4% 70.0 2.2% 2.4% 5.12
32. Derek Anderson, Cleveland Browns 142 283 1615 9 8 50.2% 66.5 3.2% 2.8% 5.71
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