NFL Quarterback Rating Formula

a = (((Comp/Att) x 100) - 30) ÷ 20
b = ((TDs/Att) x 100) ÷ 5
c = (9.5 - ((Int/Att) x 100)) ÷ 4
d = ((Yards/Att) - 3) ÷ 4

a,b,c,d cannot be greater than 2.375 or less than 0

QB Rating = (a=b=c=d) ÷ .06