Does anyone know how to convert IGCSE, AS Level, and A level to GPA?

Hello there! There doesn't seem to be a universal way to do a conversion. I found this article that might help: http://en.ulink.cn/Shanghai/Academic/Assessment/. Others suggest a slightly different approximation:

A* - 4.0

A - 4.0

B - 3.7

C - 3.0

D - 2.3

E - 2.0

F - 1.3

G - 1.0

U - 0

Also keep in mind that A level courses are considered advanced, and you'd want to add 1 point to each course to calculate a weighted GPA. If you're using this for the chancing engine, this should be a loose approximation. When it comes to your actual applications though, there's no need to do a conversion. Admissions officers are familiar with the rigor of IGCSE, AS Level, and A level courses and will do their own conversion. To be sure, you can always call the admissions offices of the schools you want to attend. Hope this helps!

In the US, the state of Iowa is known for education research and development. Iowa State University offers a GPA calculator you may find useful. https://www.admissions.iastate.edu/apply/gpa_calc.php