CGPA Calculator University Of Central Punjab

as the University Of Central Punjab provides the grading systems to the students for their results. I want to know about the CGPA Calculator of the University Of Central Punjab. What is this calculator for about and how it converts result into the CGPA score of University Of Central Punjab?

I am doing B.Sc from University Of Central Punjab and I got 89% marks in B.Sc(2nd sem) Exam and now I want to convert it into CGPA (Cumulative Grade Point Average) . Would you please provide me a link from where I can get CGPA Calculator of University Of Central Punjab ??