
<PAGE>
 
                                                                      EXHIBIT 11

                      ADAC LABORATORIES AND SUBSIDIARIES
               COMPUTATION OF CONSOLIDATED NET INCOME PER SHARE
                     (in thousands except per share data)
          For the three years in the period ended September 29, 1996

<TABLE>
<CAPTION>
                                              FISCAL YEARS
                                              ------------
                                         1996     1995     1994
                                         ----     ----     ----
<S>                                     <C>      <C>      <C>
Average shares outstanding              17,360   16,426   15,858
 
Net effect of dilutive stock options
and warrants                             1,147      653      650
                                       -------  -------  -------
 
 
Average common and common
equivalent shares outstanding           18,507   17,079   16,508
                                       =======  =======  =======
 
Net income                             $16,637  $11,073  $17,521
                                       =======  =======  =======
 
Net income per share                   $   .90  $   .65  $  1.06
                                       =======  =======  =======
 </TABLE>

Primary and fully diluted income per share differs by less than one cent  in all
periods.
