What is the benefit of having weighted grades for him? My gut is that it's not worth it. But maybe it has to do with how you look at / use weighted grades. To me, I think of weighted grades to help with class rank, to show that the degree of difficulty of a particular class is harder than another class, but primarily leading to "looking better" when applying to colleges. From that perspective, the weighted grades won't make any difference in elementary school. But perhaps you see another use or purpose to them?