<p>Our local HS uses a system that works very well. An “A” is a 4.0, an “A-” is a 3.7, a “B+” is a 3.3, etc., and weighting goes like this:</p>
<p>“AP courses with a letter grade of C- or higher are weighted at +.0125, per course, per quarter, added to the cumulative GPA.”</p>
<p>If you play around with it you can see that it avoids all of the problems kentuckymom refers to.</p>