EXHIBIT 11 ELECTRO SCIENTIFIC INDUSTRIES, INC. AND SUBSIDIARIES CALCULATION OF EARNINGS PER SHARE (thousands of dollars except per share amounts) NUMBER OF SHARES ----------------- YEARS ENDED MAY 31, ------------------- 1996 1995 1994 ----- ---- ----- Weighted average number of shares of common stock outstanding 8,605,782 7,510,191 6,332,833 Common stock equivalents: Application of the treasury stock method to the stock option plan - - 81,110 --------- --------- --------- Weighted average number of shares used in net income per share 8,605,782 7,510,191 6,413,943 --------- --------- --------- --------- --------- --------- Net income $ 16,082 $ 11,517 $ 7,874 --------- --------- --------- --------- --------- --------- Net income per share (primary and fully diluted) (1): $ 1.87 $ 1.53 $ 1.23 --------- --------- --------- --------- --------- --------- (1) No additional shares related to outstanding options are included in the primary and fully diluted calculation for the years ended May 31, 1996 and 1995, as the differences were not significant. Page 42 of 44