<PAGE>
                             CORECOMM INCORPORATED                    Exhibit 11
                       CALCULATION OF NET LOSS PER SHARE
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<CAPTION> 
                                           Weighted Average Number of Shares
                                  ---------------------------------------------------------
                                  Total       Year Ended        Year Ended      Year Ende
     Description of Issuance    Outstanding     31-Dec-96       31-Dec-95       31-Dec-94 
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 <S>        <C>               <C>            <C>             <C>             <C> 
 01/01/94   Common Stock       9,759,772     9,759,772       9,759,772       9,759,772
 01/12/94   Common Stock             125           125             125             121
 01/12/94   Common Stock           4,250         4,250           4,250           4,110
 02/18/94   Common Stock              83            83              83              72
 03/18/94   Common Stock             625           625             625             493
 03/30/94   Common Stock           8,500         8,600           8,500           6,427
 04/28/94   Common Stock             486           486             486             329
 05/10/94   Common Stock           6,252         6,252           6,252           4,025
 05/20/94   Common Stock           7,875         7,875           7,875           4,854
 05/20/94   Common Stock             834           834             834             514
 06/08/94   Common Stock              83            83              83              47
 06/30/94   Common Stock         150,000       150,000         150,000          75,676
 07/06/94   Common Stock             208           208             208             101
 07/28/94   Common Stock             125           125             125              53
 08/19/94   Common Stock             208           208             208              76
 10/19/94   Common Stock          51,429        51,429          51,429          10,286
 10/26/94   Common Stock             513           513             513              93
 11/30/94   Common Stock             236           236             236              20
 12/14/94   Common Stock           2,500         2,500           2,500             116
 12/30/94   Common Stock           6,511         6,511           6,511              18
 01/12/95   Common Stock           6,813         6,813           6,589
 02/02/95   Common Stock           1,945         1,945           1,769
 02/23/95   Common Stock             521           521             444
 04/05/95   Treasury Stock       (25,000)      (25,000)        (18,493)
 04/06/95   Treasury Stock       (25,000)      (25,000)        (18,425)
 04/06/95   Common Stock           1,200         1,200             884
 04/07/95   Treasury Stock       (18,000)      (18,000)        (13,216)
 04/07/95   Treasury Stock        (4,000)       (4,000)         (2,937)
 04/10/95   Treasury Stock       (10,000)      (10,000)         (7,260)
 04/11/95   Treasury Stock       (10,000)      (10,000)         (7,233)
 04/12/95   Treasury Stock        (8,000)       (8,000)         (5,764)
 05/18/95   Common Stock           3,500         3,500           2,177
 06/01/95   Common Stock           3,125         3,125           1,824
 06/17/95   Common Stock           1,388         1,388             757
 07/12/95   Common Stock           3,125         3,125           1,473
 07/24/95   Common Stock          83,333        83,333          36,530
 07/28/95   Common Stock           1,388         1,388             583
 08/04/95   Common Stock       2,685,398     2,685,398       1,118,231
 08/04/95   Common Stock             168           168              77
 08/07/95   Common Stock           9,522         9,622           3,809
 08/18/95   Treasury Stock       (50,000)      (50,000)        (18,493)
 08/21/95   Common Stock             521           521             188
 09/26/95   Treasury Stock       (20,000)      (20,000)         (8,260)
 09/28/95   Treasury Stock       (25,000)      (25,000)         (6,438)
 09/29/95   Treasury Stock        (5,000)       (5,000)         (1,274)
 10/12/95   Treasury Stock        (7,000)       (7,000)         (1,534)
 02/07/96   Common Stock         820,404       735,225
 02/13/96   Common Stock           2,084         1,833
 02/27/96   Common Stock           3,500         2,945
 03/06/96   Common Stock             513           257
 03/12/96   Common Stock           5,555         4,462
 04/23/96   Treasury Stock       (15,000)      (10,328)
 04/24/96   Treasury Stock       (53,000)      (36,347)
 04/25/96   Treasury Stock       (25,000)      (17,077)
 04/26/96   Treasury Stock       (35,000)      (23,811)
 04/29/96   Treasury Stock       (25,000)      (16,803)
 04/30/96   Treasury Stock       (12,500)       (8,367)
 05/01/96   Treasury Stock        (5,000)       (3,333)
 05/02/96   Treasury Stock       (22,500)      (14,939)
 06/10/96   Common Stock             642           302           
 06/11/96   Common Stock           3,000         1,664
 09/20/96   Common Stock           1,042           280
 11/06/96   Common Stock              42             6
 11/01/96   Common Stock         (15,000)       (2,459)
 11/04/96   Common Stock         (35,000)       (5,451)
 11/05/96   Common Stock          (6,000)         (765)
 11/12/96   Common Stock         (25,000)       (3,347)
 11/27/96   Common Stock         (25,000)       (2,322)
 12/06/96   Common Stock         (15,000)       (1,025)
 12/23/96   Common Stock         (20,000)         (437)
 12/24/96   Common Stock          (2,500)          (48)
 12/26/96   Common Stock          (7,500)         (102)
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Weighted average number
 of common shares                13,089,064    13,195,605      11,069,633       9,867,143
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Net affect of dilutive 
 stock options                                    831,437
                          ----------------------------------------------------------------
Total                            13,089,064    14,027,042      11,069,633       9,867,143
                          ----------------------------------------------------------------
Net income (loss)                              $5,114,000     ($1,451,000)    ($4,812,143)
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Net loss per common share                           $0.36          ($0.13)         ($0.49)
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