The Fairfax County School Board has instituted a modified ten-point grading scale that uses pluses and minuses and increasing the grade point weight (GPA) for Advanced Placement (AP), International Baccalaureate (IB), selected dual enrollment college, and honors courses.

The additional weighting of AP and IB courses and the additional weighting of honors courses is retroactive for all courses that appear on a student's high school transcript. For example, a student who is a junior during the 2009-10 school year who took an honors course as a freshman has received an additional 0.5 weight for that course added to his or her transcript retroactively. Dual enrollment courses that are currently weighted will continue to be weighted.

The new grading scale is effective September 2009 and is not retroactive.