How to Calculate +/- on a High School Transcript

I just had a question from a reader who wondered how to calculate quality points for plus and minus grades on the high-school transcript. The free GPA calculator just calculates whole numbers and weighted grades, but it’s pretty easy to allocate a point value for +/-. Just add or subtract 1/3 of a point from the whole number. You’ll come up with this:

A = 4
A- = 3.67
B+ = 3.33
B = 3
B- = 2.67
C+ = 2
C- = 1.67
D+ = 1.33
D = 1
D- = .67