EXHIBIT 11 OCCIDENTAL PETROLEUM CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE FOR THE THREE AND SIX MONTHS ENDED JUNE 30, 2001 AND 2000 (Amounts in millions, except per-share amounts) Three Months Ended Six Months Ended June 30 June 30 ---------------------------- ---------------------------- 2001 2000 2001 2000 - ----------------------------------------------------- ------------ ------------ ------------ ------------ BASIC EARNINGS PER SHARE Income before extraordinary item and effect of changes in accounting principles $ 473 $ 564 $ 984 $ 835 Effect of repurchase of Trust Preferred Securities -- -- -- 1 ------------ ------------ ------------ ------------ Earnings before extraordinary item and effect of changes in accounting principles 473 564 984 836 Extraordinary loss, net -- -- (3) -- Cumulative effect of changes in accounting principles, net -- -- (24) -- ------------ ------------ ------------ ------------ Earnings applicable to common stock $ 473 $ 564 $ 957 $ 836 ============ ============ ============ ============ Weighted average common shares outstanding 372.0 368.8 371.1 368.5 ============ ============ ============ ============ Basic earnings per share Income before extraordinary item and effect of changes in accounting principles $ 1.27 $ 1.53 $ 2.65 $ 2.27 Extraordinary loss, net -- -- (.01) -- Cumulative effect of changes in accounting principles, net -- -- (.06) -- ------------ ------------ ------------ ------------ Basic earnings per common share $ 1.27 $ 1.53 $ 2.58 $ 2.27 ============ ============ ============ ============ DILUTED EARNINGS PER SHARE Earnings before extraordinary item and effect of changes in accounting principles $ 473 $ 564 $ 984 $ 836 Extraordinary loss, net -- -- (3) -- Cumulative effect of changes in accounting principles, net -- -- (24) -- ------------ ------------ ------------ ------------ Earnings applicable to common stock $ 473 $ 564 $ 957 $ 836 ============ ============ ============ ============ Weighted average common shares outstanding 372.0 368.8 371.1 368.5 Dilutive effect of exercise of options outstanding 2.7 .3 1.7 .2 ------------ ------------ ------------ ------------ 374.7 369.1 372.8 368.7 ============ ============ ============ ============ Diluted earnings per share Income before extraordinary item and effect of changes in accounting principles $ 1.26 $ 1.53 $ 2.64 $ 2.27 Extraordinary loss, net -- -- (.01) -- Cumulative effect of changes in accounting principles, net -- -- (.06) -- ------------ ------------ ------------ ------------ Diluted earnings per common share $ 1.26 $ 1.53 $ 2.57 $ 2.27 ===================================================== ============ ============ ============ ============ EXHIBIT 11 (CONTINUED) OCCIDENTAL PETROLEUM CORPORATION AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE FOR THE THREE AND SIX MONTHS ENDED JUNE 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 Six Months Ended June 30 June 30 ----------------------------------------- ----------------------------------------- 2001 2000 2001 2000 ------------------- ------------------ ------------------- ------------------ STOCK OPTIONS Number of shares .02 4.16 .02 4.61 Price range per share $29.063 -- $29.438 $23.125 -- $29.438 $29.063 -- $29.438 $21.250 -- $29.438 Expiration range 12/01/07 -- 4/29/08 8/18/00 -- 7/08/08 12/01/07 -- 4/29/08 8/18/00 -- 7/08/08 - --------------------------- ------------------- ------------------ ------------------- ------------------