EXHIBIT 11.1 EMCON COMPUTATION OF INCOME PER SHARE (In thousands except per share data) Three months ended Six months ended June 30, June 30, 1997 1996 1997 1996 ---- ---- ---- ---- Net income ......................................................... $ 494 $ 365 $1,185 $ 399 Proforma interest income related to modified treasury stock method ........................................... N/A 57 N/A 116 ------ ------ ------ ------ Adjusted net income ................................................ $ 494 $ 422 $1,185 $ 515 ====== ====== ====== ====== Weighted average number of common shares outstanding during the period ................................... 8,534 8,481 8,534 8,463 Common and common equivalent shares outstanding for the purpose of calculating primary net income per share .................................... 8,519 N/A 8,496 N/A Common equivalent share from outstanding stock options using the modified treasury stock method .................................................... N/A 716 N/A 779 Incremental shares to reflect full dilution (1) .................... 75 0 37 0 ------ ------ ------ ------ Total shares for purposes of calculating diluted income per share (1) ............................................ 8,594 9,197 8,533 9,242 ====== ====== ====== ====== Primary income per share ........................................... $ 0.06 $ 0.05 $ 0.14 $ 0.06 ====== ====== ====== ====== Fully diluted income per share ..................................... $ 0.06 $ 0.05 $ 0.14 $ 0.06 ====== ====== ====== ====== - ------------------ (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%. 24