GPA Calculator - Version 1.2 This GPA Calculator lets you determine how your current term will affect your overall GPA. You can use it before you know your grades to predict your CGPA (Cumulative Grade Point Average). Due to the way this calculator is made, it won't calculate grade replacement if you are repeating a course. GPA Calculator will include both failing and new grades.First, you need to enter your total grade points. Take a look at the table below and calculate number of grade points you earned so far. For example, if you have taken only one term and passed 6 courses with grade B, your total grade points would be 18 (6 courses x 3.0 points).