EXHIBIT 12 PEOPLES BANCORP INC. AND SUBSIDIARIES COMPUTATION OF RATIOS Return on average assets Net income/Average assets Return on average stockholders' equity Net income/Average stockholders' equity Net interest margin Fully tax equivalent net interest income/Average earning assets Non-interest income leverage ratio (Non-interest income less non-operating gains and losses)/(Non-interest expense less amortization of goodwill and other intangible assets) Efficiency ratio (Non-interest expenses less intangible and non-recurring, non-operational items)/(Fully tax equivalent net interest income plus non-interest income) Average stockholders' equity to Average stockholders' equity/Average average assets assets Average loans to average deposits Average gross loans/Average deposits Dividend payout ratio Dividends declared/Net income Allowance for loan losses to period Allowance for loan losses/Gross loans end total net of unearned interest loans Tier 1 Capital ratio Stockholders' equity less intangible assets and securities mark-to-market capital reserve ("Tier 1 Capital")/Risk adjusted assets Total Capital ratio Tier 1 Capital plus allowance for loan losses/Risk adjusted assets Tier 1 Leverage ratio Tier 1 Capital/Quarterly average assets Cash dividends per share Cash dividends paid/Common shares outstanding at date of declaration Book value per share Total stockholders' equity/Common shares outstanding at quarter-end TANGIBLE Book value per share (Total stockholders' equity less goodwill and other intangible assets)/ Common shares outstanding at quarter-end Nonperforming loans as a percentage (Nonaccrual loans plus loans past due of period end loan 90 days or greater plus renegotiated loans)/Gross loans net of unearned interest Nonperforming assets as a percentage (Nonaccrual loans plus loans past due of total assets 90 days or greater plus renegotiated loans plus other real estate owned)/ Total assets