CLARK USA, INC. AND SUBSIDIARIES EXHIBIT 12.1 CALCULATION OF RATIO OF EARNINGS TO FIXED CHARGES (DOLLARS IN THOUSANDS) NINE MONTHS ENDED YEAR ENDED DECEMBER 31, SEPTEMBER 30, ---------------------------------------------- ------------------ 1992 1993 1994 1995 1996 1996 1997 ------- -------- ------- -------- -------- -------- -------- Earnings Available for Fixed Charges Pretax earnings from continuing operations $ 2,382 ($10,652) $11,793 ($58,977) ($69,284) ($46,616) $ 36,921 Fixed charges 50,792 58,994 62,469 70,894 96,816 72,382 74,642 Capitalized interest (5,108) (2,776) (2,409) (1,404) (1,033) (754) (972) Other (a) 182 197 (468) (1,413) (136) (139) (103) ------- -------- ------- -------- -------- -------- -------- $48,248 $45,763 $71,385 $ 9,100 $36,353 $24,873 $110,488 ======= ======== ======= ======== ======== ======== ======== Fixed Charges Gross interest expense (b) $49,444 $56,327 $58,389 $67,461 $91,309 $68,288 $ 70,394 Interest factor attributable to rent expense 1,348 2,667 4,100 3,433 5,507 4,094 4,248 ------- -------- ------- -------- -------- -------- -------- $50,792 $58,994 $62,469 $70,894 $96,816 $72,382 $ 74,642 ======= ======== ======= ======== ======== ======== ======== Ratio of Earnings to Fixed Charges 0.95x 0.78x 1.14x 0.13x 0.38x 0.34x 1.48x - ------- (a) Represents adjustments to recognize only distributed earnings for less than 50% owned companies accounted for under the equity method. (b) Represents interest expense on long-term and short-term debt and amortization of debt discount and debt issue costs.