GPA and Weighted Grades

Letter-to-points on a 4.0 scale, credit-hour GPA, and a weighted course average from score × weight pairs.

Name	Formula	Note
Unweighted GPA	`GPA = Σ (points × credits) / Σ credits` Credits ≠ 0. Same formula as a weighted mean.	Credits ≠ 0. Same formula as a weighted mean.
4.0 letter map	`A=4.0 · B=3.0 · C=2.0 · D=1.0 · F=0` Plus/minus policies differ by school (±0.3 common).	Plus/minus policies differ by school (±0.3 common).
Course weighted grade	`G = Σ (scoreᵢ × weightᵢ) / Σ weightᵢ` Weights must share a unit (percent or points).	Weights must share a unit (percent or points).
Target GPA remainder	`need = (target×total − current×done) / left` Average still required on remaining credits.	Average still required on remaining credits.

Open a calculator and put these formulas to work.