High schools often report GPA (grade point average) on a 4.0 scale. The top grade is an A, which equals 4.0. You calculate your overall GPA by averaging the scores of all your classes. ... Search for Colleges Using Your GPA. Letter GradePercent Grade4.0 Scale A+97-1004.0 A93-964.0 A-90-923.7 B+87-893.3 8 more rows