<PAGE>


                                                                      EXHIBIT 11

                         MANGOSOFT, INC. AND SUBSIDIARY
                          (A DEVELOPMENT STAGE COMPANY)

                COMPUTATION OF NET INCOME (LOSS) PER COMMON SHARE

                THREE AND SIX MONTHS ENDED JUNE 30, 2000 AND 1999
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                            THREE MONTHS ENDED JUNE 30,
                                                                            ---------------------------
                                                                              2000               1999
                                                                            --------           --------
<S>                                                                      <C>                 <C>
BASIC NET INCOME (LOSS) PER COMMON SHARE:
     Net income (loss) applicable to common shares as reported           $ 7,067,382         $(2,539,340)
     Weighted average number of common shares outstanding:
          Common Stock .......................................            26,142,501             136,949
                                                                         -----------         -----------

          Basic net income (loss) per common share ...........           $      0.27         $    (18.54)
                                                                         ===========         ===========
DILUTED NET INCOME (LOSS) PER COMMON SHARE:
     Net income (loss) applicable to common shares as reported           $ 7,067,382         $(2,539,340)
     Weighted average number of common shares outstanding:
          Common Stock .......................................            26,142,501             136,949
          Effect of common stock equivalents .................             3,337,397                  --
                                                                         -----------         -----------
               Total .........................................            29,479,898             136,949
                                                                         -----------         -----------
          Diluted net income (loss) per common share .........           $      0.24         $    (18.54)
                                                                         ===========         ===========


<CAPTION>
                                                                             SIX MONTHS ENDED JUNE 30,
                                                                            ---------------------------
                                                                              2000               1999
                                                                            --------           --------
<S>                                                                      <C>                 <C>
BASIC NET LOSS PER COMMON SHARE:
     Net loss applicable to common shares as reported ....               $(26,802,848)       $ (5,142,908)
     Weighted average number of common shares outstanding:
          Common Stock ...................................                 23,153,033             136,949
                                                                         ------------        ------------
          Basic net loss per common share ................               $      (1.16)       $     (37.55)
                                                                         ============        ============
DILUTED NET LOSS PER COMMON SHARE:
     Net loss applicable to common shares as reported ....               $(26,802,848)       $ (5,142,908)
     Weighted average number of common shares outstanding:
          Common Stock ...................................                 23,153,033             136,949
          Effect of common stock equivalents .............                         --                  --
                                                                         ------------        ------------
               Total .....................................                 23,153,033             136,949
                                                                         ------------        ------------
          Diluted net loss per common share ..............               $      (1.16)       $     (37.55)
                                                                         ============        ============
</TABLE>



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