EXHIBIT 11 ABBOTT LABORATORIES AND SUBSIDIARIES CALCULATION OF EARNINGS PER COMMON SHARE (DOLLARS AND SHARES IN MILLIONS EXCEPT PER SHARE AMOUNTS) THREE MONTHS ENDED MARCH 31 --------------------------- 1998 1997 ---- ---- 1. Net earnings $ 589.6 $ 534.8 --------- --------- 2. Average number of common shares outstanding 764.0 774.0 --------- --------- 3. Basic earnings per common share (1 divided by 2) $ .77 $ .69 --------- --------- --------- --------- 4. Diluted earnings per common share: a. Stock options granted and outstanding for which the market price at quarter-end exceeds the option price 27.8 28.6 --------- --------- --------- --------- b. Aggregate proceeds to the Company from the exercise of options in 4.a: 1. Cash received upon exercise $ 1,181.8 $ 942.8 ---------- ---------- 2. Tax benefits to be credited to earnings employed in the business 82.0 63.6 ---------- ---------- Total proceeds (sum of 1-2) $ 1,263.8 $ 1,006.4 ---------- ---------- ---------- ---------- c. Average market price of the Company's common stock $ 72.846 $ 56.038 ---------- ---------- ---------- ---------- d. Shares which could be repurchased under the treasury stock method (4.b. divided by 4.c.) 17.3 18.0 ---------- ---------- ---------- ---------- e. Addition to average outstanding shares (4.a. - 4.d.) 10.5 10.6 ---------- ---------- ---------- ---------- f. Shares for diluted earnings per common share calculation (2. + 4.e.) 774.5 784.6 ---------- ---------- ---------- ---------- g. Diluted earnings per common share (1. divided by 4.f.) $ .76 $ .68 ---------- ---------- ---------- ----------