<p>My school does it like this:</p>
<p>A+ 97-100 4.33
A 93-96 4.00
A- 90-92 3.67
B+ 87-89 3.33
B 83-86 3.00
B- 80-82 2.67</p>
<p>etc...</p>
<p>A perfect unweighted GPA would be 4.33, but nobody gets more than 4.0 to 4.15 or so. Weight from every single AP and honors class is added for the first 3 years and half of the second year... .05 per honors course and .07 for AP. My total weight comes out to .97, so my GPA jumps from a 3.75 to a 4.72.</p>