EXHIBIT 11.1 EMCON COMPUTATION OF INCOME PER SHARE (In thousands except per share data) Three months ended Nine months ended September 30, September 30, 1996 1995 1996 1995 ---- ---- ---- ---- Net income ......................................................... $ 259 $ 650 $ 658 $1,758 Proforma interest income related to modified treasury stock method ........................................... 58 59 74 194 ------ ------ ------ ------ Adjusted net income ................................................ $ 317 $ 709 $ 732 $1,952 ====== ====== ====== ====== Weighted average number of common shares outstanding during the period ...................................... 8,512 8,296 8,483 8,255 Common equivalent share from outstanding stock options using the modified treasury stock method .................................................... 691 657 744 660 Incremental shares to reflect full dilution (1) ................. 0 0 0 0 ------ ------ ------ ------ Total shares for purposes of calculating diluted income per share (1) ............................................... 9,203 8,953 9,227 8,915 ====== ====== ====== ====== Primary income per share ........................................... $ 0.03 $ 0.08 $ 0.08 $ 0.22 ====== ====== ====== ====== Fully diluted income per share ..................................... $ 0.03 $ 0.08 $ 0.08 $ 0.22 ====== ====== ====== ====== - ----------------------- (1) This calculation is submitted in accordance with Regulation S-K Item 601(b)(11) although not required by footnote 2 to paragraph 14 to APB opinion No. 15, because it results in dilution of less than 3%. 17