GPA scales vary - how can you tell?

Looking at “average” and 75th percent and up GPA scores for admissions on various college websites. How do you know which scale they use? What does this posted average reflect?

Our private HS just changed our grading school for class of 2019 (my class) so it’s hard to know where I stand.

Suggestions?

  • grading scale (not school - sorry its summer now lol)