## NFL QB Rating Calculator

Update: February 14th, 2010

### How To Calculate Passer Rating

- Required Stats
- Pass Attempts
- Pass Completions
- Passing Yards
- Passing Touchdowns
- Interceptions

- Compute these four calculations.
- Completion Percentage
- Find completion percentage.
- Subtract 30 from completion percentage.
- Multiply the result by 0.05.

- If result is less than zero (0) then assign it a zero (0).
- If result is greater than 2.375 then assign it 2.375.

- Average Yards Gained Per Attempt
- Find average yards gained per attempt.
- Subtract 3 from yards-per-attempt.
- Multiply the result by 0.25.

- If result is less than zero (0) then assign it a zero (0).
- If result is greater than 2.375 then assign it 2.375.

- Touchdown Percentage
- Calculate percentage of touchdowns per attempt.
- Multiply the result by 0.2.

- If result is less than zero (0) then assign it a zero (0).
- If result is greater than 2.375 then assign it 2.375.

- Interception Percentage
- Calculate percentage of interceptions per attempt.
- Multiply the result 0.25.
- Subtract the result from 2.375.

- If result is less than zero (0) then assign it a zero (0).
- If result is greater than 2.375 then assign it 2.375.

- Completion Percentage
- Add the four results together to get a new number.
- Divide that number by six (6).
- Multiply that number by 100 and that is the passer rating (usually rounded to 1 decimal place).