EXHIBIT 12 PEOPLES BANCORP INC. AND SUBSIDIARIES COMPUTATION OF RATIOS Return on average stockholders' equity Net income/Average stockholders' equity Return on average assets Net income/Average assets Net interest margin Fully tax equivalent net interest income/Average earning assets Non-interest Income Leverage Ratio (Non-interest income less securities and asset disposal gains and/or losses)/(Non-interest expense less intangible asset amortization) Efficiency Ratio (Non-interest expenses less intangible asset amortization)/ (Fully tax equivalent net interest income plus non-interest income securities and asset disposal gains and/or losses) 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 Nonperforming loans as a percentage (Nonaccrual loans plus loans past due of period end loans 90 days or greater plus loans renegotiated loans)/Gross loans net of unearned interest Nonperforming assets as a percentage (Nonaccrual loans plus loans past of total assets 90 days or greater plus assets renegotiated loans plus other real estate owned)/Total assets Allowance for loan losses to period Allowance for loan losses/Gross net end total loans 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 Tangible Capital Ratio (Total stockholders' equity less goodwill and other intangible assets) /(Total assets less goodwill and other intangible assets)