In Sharepoint, while creating feedback survey, its not possible to create a calculated column. A calculated column can be added to list. But same can't be added to a feedback survey. However, in reality navigational link to create calculated columns is hidden by microsoft sharepoint guys..
Once you created a calculated column from site columns gallery, you can add it to the survey website by using a small hack.
URL of the new page will comes in below format.
Replace "suvedit" with "AddFieldFromTemplate". This takes you the page to add calculated columns.
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