Exhibit 11.0 BTU INTERNATIONAL, INC. CALCULATION OF NET LOSS PER COMMON AND COMMON EQUIVALENT SHARE (in thousands, except share and per share data) For the Three Months Ended For the Nine Months Ended ----------------------------- ------------------------- Sept. 28, Sept. 29, Sept. 28, Sept. 29, 2003 2002 2003 2002 - ------------------------------------------------------------------------------------------------------- Net loss $ (1,617) $ (1,661) $ (5,253) $ (4,427) - ------------------------------------------------------------------------------------------------------- Net loss applicable to common stockholders $ (1,617) $ (1,661) $ (5,253) $ (4,427) ======================================================================================================= Weighted average number of shares outstanding: Basic Shares 7,030,140 6,910,226 7,011,834 6,873,843 Effect of Dilutive Options 0 0 0 0 - ------------------------------------------------------------------------------------------------------- Diluted Shares 7,030,140 6,910,226 7,011,834 6,873,843 ======================================================================================================= Loss per Share Basic $ (0.23) $ (0.24) $ (0.75) $ (0.64) Diluted $ (0.23) $ (0.24) $ (0.75) $ (0.64) ======================================================================================================= 14