In the NFL, passer rating is calculated through the following steps: STEP 1: Calculate the percentage of completions score [(COMP/ATT)*100]-30}*0.05 In this step, if this value obtained is greater than 2.375, then the value is 2.375. If this value obtained is less than 0, then the value is 0. STEP 2: Calculate the yards per attempt score [(YDS/ATT)-3]*0.25 In this step, if this value obtained is greater than 2.375, then the value is 2.375. If this value obtained is less than 0, then the value is 0. STEP 3: Calculate the touchdown per attempt score [(TD/ATT)*100]*0.2 OR (TD/ATT)*20 In this step, if this value obtained is greater than 2.375, then the value is 2.375. STEP 4: Calculate the interceptions per attempt score 2.375-{[(INT/ATT)*100]*0.25} OR 2.375-[(INT/ATT)*25] In this step, if this value obtained is less than 0, then the value is 0. STEP 5: Compute the passer rating [(STEP 1 + STEP 2 + STEP 3 + STEP 4)/6]*100 ----- The passer rating ranges from a minimum rating of 0 to a maximum rating of 158.3333...repeating 3s (or 158.3, rounded to the nearest 10ths, as the NFL posts it). ----- Let's compute passer rating using two examples from the TEN @ NE game played on October 18, 2009. EXAMPLE 1: Tom Brady COMP: 29 ATT: 34 YDS: 380 TD: 6 INT: 0 STEP 1: {[(29/34)*100]-30}*0.05 = 2.765 Since this value is more than 2.375, a value of 2.375 is used in place of 2.765 for the final computation. STEP 2: [(380/34)-3]*0.25 = 2.044 STEP 3: [(6/34)*100]*0.2 = 3.529 Since this value is greater than 2.375, a value of 2.375 is used in place of 3.529 for the final computation. STEP 4: 2.375-{[(0/34)*100]*.0.25} = 2.375 STEP 5: [(2.375+2.044+2.375+2.375)/6]*100 = 152.819 (or 152.8) It's amazing that Tom Brady didn't have a perfect rating after that amazing performance!!! EXAMPLE 2: Kerry Collins COMP: 2 ATT: 12 YDS: -7 TD: 0 INT: 1 STEP 1: {[(2/12)*100]-30}*0.05 = -0.667 Since this value is less than 0, a value of 0 is used in place of -0.667 for the final computation. STEP 2: [(-7/12)-3]*0.25 = -0.896 Since this value is less than 0, a value of 0 is used in place of -0.896 for the final computation. STEP 3: [(0/12)*100]*0.2 = 0 STEP 4: 2.375-{[(1/12)*100]*.0.25} = .292 STEP 5: [(0+0+0+.292)/6]*100 = 4.861 (or 4.9) ----- Hope this explains the passer rating question, Ed.