EXHIBIT 11 THE GENERAL CHEMICAL GROUP INC. COMPUTATION OF EARNINGS PER COMMON AND COMMON EQUIVALENT SHARE (IN THOUSANDS, EXCEPT PER SHARE AMOUNT) (UNAUDITED) Earnings per share were calculated as follows: THREE MONTHS ENDED NINE MONTHS ENDED SEPTEMBER 30, SEPTEMBER 30, ------------------- ---------------- 1996 1997 1996 1997 ---- ---- ---- ---- Primary Total income used for primary earnings per share........................... $ 14,634 $ 15,102 $ 30,992 $ 44,074 ======== ======== ======== ======== Weighted average common shares outstanding.................................. 22,237 20,955 20,996 21,511 Weighted average common equivalent shares............................ 929 1,213 480 1,087 -------- -------- -------- -------- Weighted average common and common equivalent share...................... 23,166 22,168 21,476 22,598 ======== ======== ======== ======== Primary earnings per common share and common equivalent shares................. $ .63 $ .68 $ 1.44 $ 1.95 ======== ======== ======== ======== Fully Diluted Total income used for primary earnings per share........................... $ 14,634 $ 15,102 $ 30,992 $ 44,074 ======== ======== ======== ======== Weighted average common shares outstanding.................................. 22,237 20,955 20,996 21,511 Weighted average common equivalent shares............................ 1,009 1,287 572 1,287 -------- -------- -------- -------- Weighted average common and common equivalent shares..................... 23,246 22,242 22,568 22,798 ======== ======== ======== ======== Primary earnings per common share and common equivalent shares................. $ .63 $ .68 $ 1.44 $ 1.93 ======== ======== ======== ======== -14-