EXHIBIT 11.1 UNIT INSTRUMENTS, INC. COMPUTATION OF EARNINGS PER SHARE Three Months Ended Nine Months Ended ------------------ ------------------ 02/28/98 03/01/97 02/28/98 03/01/97 ----------- ---------- ----------- ----------- NET LOSS APPLICABLE TO COMMON STOCK HOLDERS $(5,076,000) $ (900,000) $(4,153,000) $(3,456,000) ============ =========== ============ ============ BASIC EARNINGS PER SHARE - ------------------------ Weighted average number of shares outstanding 4,192,334 4,370,325 4,394,334 4,375,794 Net loss per share $ (1.21) $ (0.21) $ (0.95) $ (0.79) ------------ ----------- ------------ ------------ EARNINGS PER SHARE ASSUMING FULL DILUTION - ----------------------------------------- Weighted average number of shares outstanding 4,192,334 4,370,325 4,394,334 4,375,794 Common share equivalents, assuming exercise of stock options and warrants -0- -0- -0- -0- ------------------ ------------------ ------------------ ------------------ Average shares used in computing earnings per share 4,192,334 4,370,325 4,394,334 4,375,794 ============ =========== ============ ============ Net loss per share $ (1.21) $ (0.21) $ (0.95) $ (0.79) ============ =========== ============ ============