Exhibit 11 AMOCO CORPORATION _________________ COMPUTATION OF BASIC AND DILUTED NET INCOME PER SHARE (in millions, except per share) Year ended December 31, 1997 1996 1995 Net income per share (basic) Shares of common stock: Weighted average number of common shares outstanding...... 490 497 495 Basic weighted average shares outstanding..................... 490 497 495 Net income....................... $2,720 $2,834 $1,862 Net income used in computing net income per common share (basic). $2,720 $2,834 $1,862 Net income per share (basic)..... $ 5.55 $ 5.69 $ 3.76 Net income per share (assuming dilution) Shares of common stock: Weighted average number of common shares outstanding...... 490 497 495 Dilutive effect of options...... 3 2 2 Diluted weighted average shares outstanding..................... 493 499 497 Net income....................... $2,720 $2,834 $1,862 Net income used in computing net income per common share (assuming dilution)............. $2,720 $2,834 $1,862 Net income per share (assuming dilution)....................... $ 5.52 $ 5.67 $ 3.75