GPA Conversion from 100 to 4.0 Scale

Hello, my sons high school uses a numerical GPA up to 100. I see that many schools are on a 4.0 scale and wondering how to properly convert his GPA for admission as a freshman.

Currently he has a unweighted GPA of 90.6429 and a weighted GPA of 95.4643.

I’d appreciate anyone had an answer on how to do this?

Not sure there is a way to convert unless we know more about the grading system, especially the weighting, but quick and dirty I’d say that’s about a 3.7 UW and 4.0 W. Why do you need to convert? If a state school converts, they will use their own system (some, for example, count anything in the 80s as a B, regardless of if it’s 80 or 89, as some do not use + and - grades).

For what purpose? If you’re doing it for giggles, you need to convert course by course before averaging. Here is one conversion:
https://pages.collegeboard.org/how-to-convert-gpa-4.0-scale

Note that for most college applications, you do not convert, but report using the HS scale - whatever that may be.

Weighted GPA is basically meaningless outside of the HS as there is no standard.

Tough to do without a course by course translation.

A long list of 90.0 grades, with a few 91 and 92 grades, could average to a 90.6 and would all be A’s, resulting in a 4.0.

An pretty even mix of 86 and 95 grades could get to 90.6 and would be a 3.5.

I’m sure there’s a way to have a mix of 79.4 and 100 grades that get to 90.6 and an even lower 4.0 scale GPA. (I’ll leave that as an exercise for the reader ;)).