<PAGE>
 
Exhibit 11

ALLIN COMMUNICATIONS CORPORATION

CALCULATION OF NET LOSS PER COMMON SHARE

          (Dollars in thousands, except per share data)
<TABLE>
<CAPTION>
                                                      Three Months      Three Months         Six Months         Six Months
                                                         Ended             Ended               Ended              Ended
                                                        June 30,          June 30,            June 30,           June 30,
                                                          1997              1998                1997               1998
                                                      ------------       ----------          ----------         ----------
<S>                                                  <C>                 <C>                 <C>                <C>
                                                                     
Net loss                                             $     (3,152)            (732)             (5,744)            (2,478)
                                                                                                                 
Accretion and dividends on preferred stock                     55               57                 119                112
                                                      ------------       ----------          ----------         ----------
                                                                                                                 
Net loss attributable to common shareholders         $     (3,207)            (789)             (5,863)            (2,590)
                                                      ============       ==========          ==========         ==========
                                                                                                                 
Net loss per common share - basic and diluted        $      (0.62)           (0.15)              (1.14)             (0.50)
                                                      ============       ==========          ==========         ==========
                                                                                                                               
Weighted average common shares outstanding                                                                                     
     during the period                                  5,184,067        5,182,267           5,184,067          5,182,267
                                                                                                             
Effect of restricted common stock                         (26,668)         (24,868)            (26,668)           (24,868)
                                                      ============       ==========          ==========         ==========
                                                                     
Shares used in calculating net loss per common                       
     share                                              5,157,399        5,157,399           5,157,399          5,157,399
                                                      ============       ==========          ==========         ==========
</TABLE>