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, 2006 2005 ------------ ------------ BASIC EARNINGS PER SHARE EARNINGS: Net income $5,931 $4,692 AVERAGE SHARES OUTSTANDING: Weighted-average common shares outstanding 10,530,444 10,419,189 - ------------------------------------------------------------------------------------------------ BASIC EARNINGS PER SHARE $0.56 $0.45 - ------------------------------------------------------------------------------------------------- DILUTED EARNINGS PER SHARE EARNINGS: Net income $5,931 $4,692 AVERAGE SHARES OUTSTANDING: Weighted-average common shares outstanding 10,530,444 10,419,189 Net effect of the assumed exercise of stock options based on the treasury stock method 124,789 138,814 - ------------------------------------------------------------------------------------------------- Total weighted-average diluted common shares 10,655,233 10,558,003 - ------------------------------------------------------------------------------------------------- - ------------------------------------------------------------------------------------------------- DILUTED EARNINGS PER SHARE $0.56 $0.44 - -------------------------------------------------------------------------------------------------