Most colleges and school report GPA on a 4.0 scale. The unweighted GPA scale is the most frequently used GPA scale. Basically, the highest GPA you can earn is a 4.0, which indicates an A average in all of your classes. A 3.0 would mean a B average, a 2.0 a C average, a 1.0 a D, and a 0.0 an F.