EXHIBIT 11 PEOPLES BANCORP INC. AND SUBSIDIARIES COMPUTATION OF EARNINGS PER SHARE (dollars in thousands, except per share data) For the Three Months Ended March 31, 2005 2004 BASIC EARNINGS PER SHARE EARNINGS: Net income $4,692 $5,366 AVERAGE SHARES OUTSTANDING: Weighted average common shares outstanding 10,419,189 10,560,228 - ------------------------------------------------------------------------------------------------- BASIC EARNINGS PER SHARE $0.45 $0.51 ================================================================================================ DILUTED EARNINGS PER SHARE EARNINGS: Net income $4,692 $5,366 AVERAGE SHARES OUTSTANDING: Weighted average common shares outstanding 10,419,189 10,560,228 Net effect of the assumed exercise of stock options based on the treasury stock method 138,814 247,779 - ------------------------------------------------------------------------------------------------- Total weighted average diluted common shares 10,558,003 10,808,007 - ------------------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------- DILUTED EARNINGS PER SHARE $0.44 $0.50 ================================================================================================