EXHIBIT 11 OCCIDENTAL PETROLEUM CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2002 AND 2001 (Amounts in millions, except per-share amounts) Three Months Ended Nine Months Ended September 30 September 30 ----------------------------- ----------------------------- 2002 2001 2002 2001 - -------------------------------------------------- ------------ ------------ ------------ ------------ BASIC EARNINGS PER SHARE Income from continuing operations $ 476 $ 443 $ 840 $ 1,426 Discontinued operations, net (74) 1 (78) 2 Extraordinary loss, net -- -- -- (3) Cumulative effect of changes in accounting principles, net -- -- (95) (24) ------------ ------------ ------------ ------------ Earnings applicable to common stock $ 402 $ 444 $ 667 $ 1,401 ============ ============ ============ ============ Weighted average basic common shares 377.1 373.5 376.0 371.9 ============ ============ ============ ============ Income from continuing operations $ 1.26 $ 1.19 $ 2.23 $ 3.83 Discontinued operations, net (.19) -- (.21) .01 Extraordinary loss, net -- -- -- (.01) Cumulative effect of changes in accounting principles, net -- -- (.25) (.06) ------------ ------------ ------------ ------------ Basic earnings per common share $ 1.07 $ 1.19 $ 1.77 $ 3.77 ============ ============ ============ ============ DILUTED EARNINGS PER SHARE Income from continuing operations $ 476 $ 443 $ 840 $ 1,426 Discontinued operations, net (74) 1 (78) 2 Extraordinary loss, net -- -- -- (3) Cumulative effect of changes in accounting principles, net -- -- (95) (24) ------------ ------------ ------------ ------------ Earnings applicable to common stock $ 402 $ 444 $ 667 $ 1,401 ============ ============ ============ ============ Basic shares 377.1 373.5 376.0 371.9 Dilutive effect of options outstanding 2.7 2.2 2.6 1.9 Dilutive effect of unvested restricted shares .6 -- .2 -- ------------ ------------ ------------ ------------ Dilutive shares 380.4 375.7 378.8 373.8 ============ ============ ============ ============ Diluted earnings per share Income from continuing operations $ 1.25 $ 1.18 $ 2.22 $ 3.81 Discontinued operations, net (.19) -- (.21) .01 Extraordinary loss, net -- -- -- (.01) Cumulative effect of changes in accounting principles, net -- -- (.25) (.06) ------------ ------------ ------------ ------------ Diluted earnings per common share $ 1.06 $ 1.18 $ 1.76 $ 3.75 ================================================== ============ ============ ============ ============ EXHIBIT 11 (CONTINUED) OCCIDENTAL PETROLEUM CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2002 AND 2001 (Amounts in millions, except per-share amounts) The following items were not included in the computation of diluted earnings per share because their effect was antidilutive: Three Months Ended Nine Months Ended September 30 September 30 ------------------------------------------- ------------------------------------------- 2002 2001 2002 2001 ------------------- ------------------- ------------------- ------------------- STOCK OPTIONS Number of shares .02 .02 .02 .02 Price range per share $27.900 -- $29.438 $29.063 -- $29.438 $29.063 -- $29.438 $29.063 -- $29.438 Expiration range 12/01/07 -- 8/29/11 12/01/07 -- 4/29/08 12/01/07 -- 4/29/08 12/01/07 -- 4/29/08