1 EXHIBIT 11.1 Statement Re: Computation of Per Share Loss of Administaff, Inc. Three months ended March 31, -------------------- 1996 1997 -------------------- Primary Average shares outstanding........................... 10,726 12,478 Net effect of dilutive stock options -- based on the treasury stock method using average market price... * * Net effect of dilutive stock warrants -- based on the treasury stock method using average market price... * * Net effect of dilutive stock warrants -- based on the if-converted method................................ * * Adjustment to give effect to shares optioned to employees within 12 months of the initial filing on Form S-1 of an initial public offering as outstanding as of the beginning of each period presented based on the treasury stock method using the offering price................................. 113 -- ------------------------ Total................................................ 10,839 12,478 ======================== Net loss............................................. ($909) ($7) Add interest from subordinated debt, net of taxes.... * * ------------------------ Net loss available for common shareholders........... ($909) ($7) ======================== Per share amount..................................... ($0.08) $0.00 ======================== Fully Diluted Average shares outstanding........................... 10,726 12,478 Net effect of dilutive stock options -- based on the treasury stock method using ending market price.... * * Net effect of dilutive stock warrants -- based on the treasury stock method using ending market price.... * * Net effect of dilutive stock warrants -- based on the if-converted method................................ * * Adjustment to give effect to shares optioned to employees within 12 months of the initial filing on Form S-1 of an initial public offering as outstanding as of the beginning of each period presented based on the treasury stock method using the offering price................................. 113 -- ------------------------ Total................................................ 10,839 12,478 ======================== Net loss............................................. ($909) ($7) Add interest from subordinated debt, net of taxes.... * * ------------------------ Net loss available for common shareholders........... ($909) ($7) ======================== Per share amount..................................... ($0.08) $0.00 ======================== * Conversion of the stock warrants and options is not assumed in the computation because their effect is antidilutive.