How to Calculate Quarterbacks' Ratings

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    • 1). Divide the number of passes completed by the number of passes attempted and multiply the result by 100 to calculate the quarterback's completion percentage. For example, if a quarterback completed 288 out of 480 passes, the completion percentage would be 60 percent.

    • 2). Subtract 30 from the quarterback's completion percentage and multiply the result by 0.05. If the completion percentage equals less than 30, use zero. If the completion percentage exceeds 77.5 percent, just award 2.375 points for this category; you don't need to subtract 30 and multiply by 0.05 (2.375 is the maximum number of points possible in any category). In this example, you would subtract 30 from 60 to get 30 and then multiply 30 by 0.05 to get 1.5. This is the Percentage of Completions.

    • 3). Divide the number of yards by the number of attempts. In this example, if the quarterback threw for 2,400 yards, you would divide 2,400 by 480 to get 5 yards per attempt.

    • 4). Subtract 3 from the number of yards per attempt and multiply the result by 0.25. If the average is less than 3 yards per attempt, use zero. If the average is greater than 12.5 yards per attempt, use 2.375. In this example, you would subtract 3 from 5 to get 2 and then multiply 2 by 0.25 to get 0.5. This is the Average Yards Gained per Attempt.

    • 5). Divide the number of touchdowns by the number of passes attempted to find the touchdown percentage. Continuing the example, if the quarterback threw 24 touchdowns, you would divide 24 by 480 to find the touchdown percentage to be 5 percent.

    • 6). Multiply the touchdown percentage by 0.2. If the touchdown percentage exceeds 11.875, use 2.375 instead (as in Step 2). In this example, you would multiply 5 by 0.2 to get 1. This is the Percentage of Touchdown Passes.

    • 7). Divide the number of intercepts thrown by the number of passes attempted to calculate the interception percentage. In this example, if the quarterback threw 12 interceptions, you would divide 12 by 480 to find the interception percentage to be 2.5 percent.

    • 8). Multiply the interception percentage by 0.25 and subtract the result from 2.375. If the interception percentage exceeds 9.5 percent, use zero as the result. In this example, you would multiply 2.5 by 0.25 to get 0.625 then subtract the result from 2.375 to get 1.75. This is the Percentage of Interceptions.

    • 9). Add the results from steps 2, 4, 6 and 8. Divide the result by 6 and multiply that by 100 to calculate the rating. Finishing this example, you would add 1.5, 0.5, 1 and 1.75 to get 4.75. Then you would divide by 6 to get 0.79167 and finally multiply by 100 to find the rating to be 79.167.

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