Converting to GPA

I am a Junior in highschool in the US. I had my Sophomore year in India. I wanted to know how UC Berkeley will consider my Indian Marks which is in numbers. Will they ask me to convert it to US GPA? I tried a few websites and ended up getting a 4.0 for the sophomore year.

Can someone tell me if Berkeley (or other colleges) want me to convert them? If so how do I convert them? Will they use the same method as those website? Does someone know how to convert them?

NOTE: My Junior year will have US GPA, I only need to conversion for sophomore year.

Thanks!

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thanks