EXHIBIT 12 OCCIDENTAL PETROLEUM CORPORATION AND SUBSIDIARIES COMPUTATION OF TOTAL ENTERPRISE RATIOS OF EARNINGS TO FIXED CHARGES (Amounts in millions, except ratios) Nine Months Ended September 30 Year Ended December 31 ------------------- ---------------------------------------------------- 2002 2001 2001 2000 1999 1998 1997 - --------------------------------------- -------- -------- -------- -------- -------- -------- -------- Income from continuing operations(a) $ 947 $ 1,575 $ 1,419 $ 1,772 $ 699 $ 402 $ 245 -------- -------- -------- -------- -------- -------- -------- Add: Provision (credit) for taxes on income (other than foreign and gas taxes) 376 387 172 871 306 204 47 Interest and debt expense(b) 243 328 411 540 515 576 446 Portion of lease rentals representative of the interest factor 18 23 7 6 31 36 39 -------- -------- -------- -------- -------- -------- -------- 637 738 590 1,417 852 816 532 -------- -------- -------- -------- -------- -------- -------- Earnings before fixed charges $ 1,584 $ 2,313 $ 2,009 $ 3,189 $ 1,551 $ 1,218 $ 777 ======== ======== ======== ======== ======== ======== ======== Fixed charges Interest and debt expense including capitalized interest(b) $ 248 $ 332 $ 417 $ 543 $ 522 $ 594 $ 462 Portion of lease rentals representative of the interest factor 18 23 7 6 31 36 39 -------- -------- -------- -------- -------- -------- -------- Total fixed charges $ 266 $ 355 $ 424 $ 549 $ 553 $ 630 $ 501 ======== ======== ======== ======== ======== ======== ======== Ratio of earnings to fixed charges 5.95 6.52 4.74 5.81 2.80 1.93 1.55 - --------------------------------------- ======== ======== ======== ======== ======== ======== ======== (a) Includes (1) minority interest in net income of majority-owned subsidiaries and partnerships having fixed charges and (2) income from less-than-50-percent-owned equity investments adjusted to reflect only dividends received. (b) Includes proportionate share of interest and debt expense of 50-percent-owned equity investments.