EXHIBIT 11 BOISE CASCADE OFFICE PRODUCTS CORPORATION COMPUTATION OF PER SHARE EARNINGS For the Three Months Ended March 31 1998 1997 (in thousands, except share information) BASIC EARNINGS PER SHARE Net income $ 17,589 $ 14,909 Shares of Common Stock: Weighted average shares outstanding 65,618,760 62,844,398 Effect of contingent shares 28,180 458,094 65,646,940 63,302,492 Basic earnings per share (1) $ .27 $ .24 DILUTED EARNINGS PER SHARE Net income $ 17,589 $ 14,909 Shares of Common Stock: Weighted average shares outstanding 65,618,760 62,844,398 Effect of contingent shares 28,180 458,094 Effect of options 92,535 142,427 65,739,475 63,444,919 Diluted earnings per share (1) $ .27 $ .23 (1) In 1997, we adopted Statement of Financial Accounting Standards No. 128 (SFAS 128), "Earnings Per Share." Earnings per share for 1997 have been restated to reflect SFAS 128. The impact of the adoption was to reduce diluted earnings per share by $.01.