<PAGE>

                                                                      EXHIBIT 11


                              WYNN'S INTERNATIONAL, INC.

                 COMPUTATION OF NET INCOME PER COMMON SHARE - PRIMARY

<TABLE>
<CAPTION>

                                                    Year ended December 31
                                           -----------------------------------------
                                             1996           1995           1994
                                           -----------    -----------    -----------
<S>                                        <C>            <C>            <C>
Income from continuing operations          $21,301,000    $16,701,000    $12,382,000
Discontinued operations:
  Income (loss) from operations...........      16,000     (1,258,000)      (561,000)
  Loss on disposal........................    (879,000)            --             --
                                           -----------    -----------    -----------
Net income................................ $20,438,000    $15,443,000    $11,821,000
                                           -----------    -----------    -----------
Weighted average number of shares
 outstanding.............................   13,641,931     13,372,973     12,494,355
Net shares assumed issued using the
 treasury stock method for stock options   
 outstanding during each period based on
 average market price....................      591,941        407,392        317,363
                                           -----------    -----------    -----------
Common and common equivalent 
 shares..................................   14,233,872     13,780,365     12,811,718
                                           -----------    -----------    -----------
Income per common share:
  Continuing operations..................        $1.50          $1.21           $.97
  Discontinued operations:
    Income (loss) from operations........           --           (.09)          (.05)
    Loss on disposal.....................         (.06)            --             --
                                           -----------    -----------    -----------
Net income per common share..............        $1.44          $1.12           $.92
                                           -----------    -----------    -----------
</TABLE>
                                  II-6
<PAGE>

                                                                      EXHIBIT 11
                                                                     (Continued)


                     COMPUTATION OF NET INCOME PER COMMON SHARE -
                                ASSUMING FULL DILUTION

<TABLE>
<CAPTION>
                                               Year ended December 31
                                       -----------------------------------------
                                         1996           1995           1994
                                       -----------    -----------    -----------
<S>                                    <C>           <C>            <C>
Income from continuing operations      $21,301,000   $16,701,000    $12,382,000
Net interest expense from convertible 
 bonds.................................         --        44,000        273,000
                                       -----------    -----------    -----------
 Net earnings from continuing 
  operations for purposes of dilution.. 21,301,000    16,745,000     12,655,000
Discontinued operations:
  Income (loss) from operations........     16,000    (1,258,000)      (561,000)
  Net interest expense from convertible 
   bonds...............................         --        15,000         94,000
                                       -----------    -----------    -----------
    Net earnings from discontinued
     operations for purposes of 
     dilution..........................     16,000    (1,243,000)      (467,000)
  Loss on disposal.....................   (879,000)           --             --
                                       -----------   -----------    -----------
Net income.............................$20,438,000   $15,502,000    $12,188,000
                                       -----------   -----------    -----------
Weighted average number of shares 
 outstanding........................... 13,641,931    13,372,973     12,494,355
Net shares assumed issued using the 
 treasury stock method for stock 
 options outstanding during each period 
 based on average or ending market 
 price, whichever is higher............    665,464       523,488        331,995
Dilutive effect of assumed 
 conversion of bonds outstanding.......         --       157,137        963,171
                                       -----------   -----------    -----------
Fully diluted shares................... 14,307,395    14,053,598     13,789,521
                                       -----------   -----------    -----------
Income per common share:
  Continuing operations................      $1.49         $1.19           $.92
  Discontinued operations:
    Income (loss) from operations......         --          (.09)          (.04)
    Loss on disposal...................       (.06)           --             --
                                       -----------   -----------    -----------
  Net income...........................      $1.43         $1.10           $.88
                                       -----------   -----------    -----------
</TABLE>
Note:    The above calculations reflect for all periods the three-for-two stock
         splits to stockholders of record in December 1996 and December 1995.

                                  II-7