Excel High School is pleased to offer our online GPA Calculator for students to review current and future grade point average. Students can use this tool to enter courses, credits, and grades to determine GPA. Remember, Excel High School does not use +/-. Excel High School uses A, B, C, D, P, and F to determine grades. Excel High School operates on a 4.0 grading scale. Earning good grades is important to ensure you are able to attend the college or university of your choice.