EXHIBIT 11 COMPUTATION OF PER SHARE EARNINGS CHEMICAL FINANCIAL CORPORATION (Unaudited) Quarter Ended Nine Months Ended September 30 September 30 1995 1994 1995 1994 (In thousands, except per share amounts) PRIMARY: Average shares outstanding 9,166 9,127 9,160 9,120 Net effect of the assumed exercise of stock options-based on the treasury stock method using average market price 157 138 138 148 9,323 9,265 9,298 9,268 Net income $ 4,910 $ 4,347 $ 13,802 $ 12,799 Net income per common share $ 0.52 $ 0.47 $ 1.48 $ 1.38 FULLY DILUTED: Average shares outstanding 9,166 9,127 9,160 9,120 Net effect of the assumed exercise of stock options-based on the treasury stock method using end of period market price 176 140 174 148 9,342 9,267 9,334 9,268 Net income $ 4,910 $ 4,347 $ 13,802 $ 12,799 Net income per common share $ 0.52 $ 0.47 $ 1.48 $ 1.38