EXHIBIT 11 OCCIDENTAL PETROLEUM CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2001 AND 2000 (Amounts in millions, except per-share amounts) Three Months Ended Nine Months Ended September 30 September 30 ---------------------------- ---------------------------- 2001 2000 2001 2000 - ----------------------------------------------------- ------------ ------------ ------------ ------------ BASIC EARNINGS PER SHARE Income before extraordinary items and effect of changes in accounting principles $ 444 $ 401 $ 1,428 $ 1,236 Effect of repurchase of Trust Preferred Securities -- -- -- 1 ------------ ------------ ------------ ------------ Earnings before extraordinary items and effect of changes in accounting principles 444 401 1,428 1,237 Extraordinary gain (loss), net -- 1 (3) 1 Cumulative effect of changes in accounting principles, net -- -- (24) -- ------------ ------------ ------------ ------------ Earnings applicable to common stock $ 444 $ 402 $ 1,401 $ 1,238 ============ ============ ============ ============ Weighted average common shares outstanding 373.5 369.2 371.9 368.7 ============ ============ ============ ============ Basic earnings per share Income before extraordinary items and effect of changes in accounting principles $ 1.19 $ 1.09 $ 3.84 $ 3.36 Extraordinary loss, net -- -- (.01) -- Cumulative effect of changes in accounting principles, net -- -- (.06) -- ------------ ------------ ------------ ------------ Basic earnings per common share $ 1.19 $ 1.09 $ 3.77 $ 3.36 ============ ============ ============ ============ DILUTED EARNINGS PER SHARE Earnings before extraordinary items and effect of changes in accounting principles applicable to common stock $ 444 $ 401 $ 1,428 $ 1,237 Extraordinary gain (loss), net -- 1 (3) 1 Cumulative effect of changes in accounting principles, net -- -- (24) -- ------------ ------------ ------------ ------------ Earnings applicable to common stock $ 444 $ 402 $ 1,401 $ 1,238 ============ ============ ============ ============ Weighted average common shares outstanding 373.5 369.2 371.9 368.7 Dilutive effect of exercise of options outstanding 2.2 .3 1.9 .2 ------------ ------------ ------------ ------------ 375.7 369.5 373.8 368.9 ============ ============ ============ ============ Diluted earnings per share Income before extraordinary items and effect of changes in accounting principles $ 1.18 $ 1.09 $ 3.82 $ 3.36 Extraordinary loss, net -- -- (.01) -- Cumulative effect of changes in accounting principles, net -- -- (.06) -- ------------ ------------ ------------ ------------ Diluted earnings per common share $ 1.18 $ 1.09 $ 3.75 $ 3.36 ===================================================== ============ ============ ============ ============ EXHIBIT 11 (CONTINUED) OCCIDENTAL PETROLEUM CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2001 AND 2000 (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 ------------------------------------------- ------------------------------------------- 2001 2000 2001 2000 -------------------- ------------------- -------------------- ------------------- STOCK OPTIONS Number of shares 0.02 5.61 0.02 5.63 Price range per share $29.063 -- $29.438 $22.000 -- $29.438 $29.063 -- $29.438 $21.250 -- $29.438 Expiration range 12/1/07 -- 4/29/08 4/28/03 -- 11/10/09 12/1/07 -- 4/29/08 4/28/03 -- 11/10/09