What is a 4.80 in grading scale?

A 4.80 on a 4.0 grading scale is above a 4.0. Most 4.0 scales don't go above 4.0; the extra .80 indicates a weighted GPA, a system that gives extra weight to certain courses (like AP or honors classes) or that uses a different scale that allows for grades above 4.0. It represents a grade significantly higher than an A (4.0).