GPA Question

<p>My school has the rank out of 100 points, and doesn't rank or weight anything. I know how to convert from that to a 4.0 GPA scale. How many other types of scales are there? Because I'm looking at this site and there are many people with over 4.0 GPAs and I don't really know how that is possible. When people are talking about their GPAs, what scale is most commonly used?</p>

<p>my weighted gpa was a 3.99. 4.0 scale, 1 additional point for each AP class.</p>

<p>our school adds .05 for every honors/AP class, for a max somewhere around 4.5 by the end of junior year.</p>