EXHIBIT 11 BARRETT BUSINESS SERVICES, INC. STATEMENT OF CALCULATION OF AVERAGE COMMON SHARES OUTSTANDING Three Months Ended Year Ended Dec. 31, 1994 Dec. 31, 1994 ------------- ------------- Primary Earnings Per Share Weighted average number of shares 6,349,861 6,333,378 Stock option plan shares to be issued at prices ranging from $3.500 to $13.563 per share 311,830 320,013 Warrant issues at a price of $4.20 per share 200,000 200,000 Less: Assumed purchase at average market price during the period using proceeds received upon exercise of options and purchase of stock, and using tax benefits of compensation due to premature dispositions (236,156) (262,133) --------- --------- Total Primary Shares 6,625,535 6,591,259 ========= ========= Fully Diluted Earnings Per Share: Weighted average number of shares 6,349,861 6,333,378 Stock option plan shares to be issued at prices of ranging from $3.500 to $13.563 per share 311,830 320,013 Warrant issues at a price of $4.20 per share 200,000 200,000 Less: Assumed purchase at the higher of ending or average market price during the period using proceeds received upon exercise of options and purchase of stock, and using tax benefits of compensation due to premature dispositions (230,251) (219,256) --------- --------- Total Diluted Shares 6,631,440 6,634,135 ========= =========