The highest GPA depends on whether the scale is weighted or unweighted:

• On the traditional unweighted GPA scale, the highest possible GPA is 4.0, which corresponds to straight A's in all classes

• However, many high schools and some colleges use a weighted GPA scale that accounts for the difficulty of courses such as Advanced Placement (AP) or honors classes. On these weighted scales, the highest GPA can go up to 5.0, with an A in an AP or honors course typically counting as a 5.0 instead of a 4.0

• Some students can achieve GPAs above 4.0 (e.g., 4.3, 4.7, or even 5.0) by taking multiple advanced courses that add extra grade points

In summary, the highest GPA on a standard scale is 4.0, but on weighted scales that consider course difficulty, it can be as high as 5.0