Thank you for your article. 4.0 gpa scale We had similar issues when we created our GPA calculator to help students evaluate their academic performance by converting letter grades to a numerical scale. This is to convert a Grade GPA 4.0 system where an"A" equals 4.0 and an"F" equals 0. To calculate GPA: assign points to each grade based on the course credits, sum these points, and divide by the total credits attempted. Or, use our free GPA to Letter grade conversion chart and GPA Calculator.