0.5 credit class

Hey guys, I currently have a C in a 0.5 credit arts class. I am in 8th grade and I was wondering how much it will affect my GPA. I have A’s in all of my other classes.

You’re in 8th grade, I assume in middle school. I wouldn’t worry at all about the C in arts class, especially if you have all A’s in your other full credit courses. It will certainly have not impact whatsoever in your total GPA for high school that you will be submitting when you apply to colleges. Just keep up your great work, since you seem to be a very good student. However, in high school, try to do well in your elective classes as well, since the colleges will see that in your transcript, although it may not affect your overall gpa all that much.
But anyways, maintain your good study habits, enjoy learning, and try to develop a passion for something, whether it is sports, extracurricular activities, etc and expand on it. Have a great school year!

but the class is a high school class , so can it have a large impact ?

For college admissions, it’s unlikely that any class taken in 8th grade would have an impact. Colleges are more concerned with grades earned in 9-12 (or 10-12 for some colleges.)

Whether the grade will appear on you HS transcript depends on the HS - ask the GC. How it will impact your GPA is simple arithmetic.