Percentage to GPA?

Applying to College
1

I have seen the scale at College Board, but different people I ask seem to have different methods. Is there a ‘standard’ way to convert percentage grade to GPA? My HS doesn’t do four point GPA at all. Here are the two methods I’ve heard:

  1. find average all my percentages, then convert to GPA.
  2. convert all my percentages to GPAs first, then average the GPAs.
    the two methods will arrive at different results. For example, in the first method say I get a 90’s in one class, and an 80’s in another, they can probably even out in a low 90, which I see can correspond to a 4.0 or thereabouts. However, if I average the two GPAs, via the second method, I wouldn’t be close to a 4.
    So does this depend on the college?
    Thank you so much!
2

While every college is free to use any method they choose, to me the only logical method is what you call method 2, because 4.0 means A’s in every class.