Exhibit 12 ---------- PPG INDUSTRIES, INC. AND CONSOLIDATED SUBSIDIARIES Computation of Ratio Of Earnings to Fixed Charges (Dollars in Millions) Year Ended December 31 Three Months ---------------------------------------------- Ended 1993 1994 1995 1996 1997 March 31, 1998 ---- ---- ---- ---- ---- -------------- Earnings: Earnings before income taxes $ 531 $ 840 $ 1,247 $ 1,215 $ 1,149 $ 318 Plus: Fixed charges exclusive of capitalized interest 128 108 113 125 136 38 Amortization of capitalized interest 11 11 12 13 13 3 Adjustments for equity affiliates and minority interest (1) (2) (4) (3) 0 (1) ----------------------------------------------------------------- Total $ 669 $ 957 $ 1,368 $ 1,350 $ 1,298 $ 358 ================================================================= Fixed Charges: Interest expense including amortization of debt discount/premium and debt expense $ 108 $ 88 $ 91 $ 102 $ 113 $ 32 Rentals - portion representative of interest 20 20 22 22 23 6 ----------------------------------------------------------------- Fixed charges exclusive of capitalized interest 128 108 113 124 136 38 Capitalized interest 6 5 9 12 10 2 ----------------------------------------------------------------- Total $ 134 $ 113 $ 122 $ 136 $ 146 $ 40 ================================================================= Ratio of earnings to fixed charges 5.0 8.4 11.3 9.9 8.9 9.0 =================================================================