CGPA Calculator For CUSAT

I have done B.Tech in Marine Engineering from Cochin University of Science and technology (CUSAT). I got 71% aggregate percentages in the B.Tech Program. I want to check my total CGPA, so how can I calculate my CGPA for this B.Tech Program done from Cochin University of Science and technology (CUSAT)? Is there a CGPA Calculator on the official website of the University.