Exhibit 11 Commonwealth Industries, Inc. Calculation of Net Income Per Share (In thousands except per share data) Three months ended March 31, 1997 1996 - ---------------------------- ---- ---- Weighted average shares of common stock outstanding (a) 10,206 10,193 ====== ====== Net income $2,168 $2,393 ====== ====== Net income per share $0.21 $0.23 ====== ====== Note: (a) Common equivalent shares relating to stock options are not material.