Calculating a QB's Passer Rating

1. Divide QB's completed passes by attempts.
2. Subtract 0.3.
3. Divide by 0.2 and recorrd the total (The sum cannot be greater than 2.375 or less than zero).
4. Divide passing yards by attempts.
5. Subtract 3.
6. Divide by 4 and record total (The sum cannot be greater than 2.375 or less than zero).
7. Divide touchdown passes by attempts.
8. Divide by 0.05 and record the total (The sum cannot be greater than 2.375 or less than zero).
9. Divide interceptions by attempts.
10. Subtract that number from 0.095.
11. Divide that product by 0.04 and record the total (The sum cannot be greater than 2.375 or less than zero).
12. Add the 4 totals recorded.
13. Multiply that total by 100.
14. Divide by 6.
15. The final number is the quarterback rating.