Most US high schools start with final course grades, convert them to grade points, and combine them using course credits. The arithmetic is simple. The policy is not. Schools can differ on plus and minus grades, AP and Honors bonuses, repeated courses, middle-school credits, and whether every subject enters GPA.
The basic high school formula
If every class has equal credit, averaging the grade points gives the same result. When a semester course is worth 0.5 credit and a year course is worth 1.0, use the full credit-weighted formula.
Worked four-course example
| Course | Grade | Points | Credits | Quality points |
|---|---|---|---|---|
| English | A | 4.0 | 1.0 | 4.0 |
| Algebra II | B+ | 3.3 | 1.0 | 3.3 |
| Biology | A- | 3.7 | 1.0 | 3.7 |
| Health | B | 3.0 | 0.5 | 1.5 |
Weighted and unweighted records
An unweighted GPA uses the base grade scale. A weighted GPA adds points or uses a separate table for approved advanced courses. There is no national 5.0 system. College Board advises students to use the scale reported by their school, and a school profile commonly explains the local weighting rules to colleges.
What to check on the transcript
- Does the school award plus and minus values?
- Are semester courses worth half a credit?
- Which AP, IB, Honors, or dual-enrollment courses receive weight?
- Do middle-school courses appear in the high school GPA?
- Are repeated courses replaced or counted together?
Reported GPA and college review are not identical
A college may read the reported GPA in context, recalculate selected academic subjects, or evaluate course rigor separately. A planning estimate cannot reproduce every admission process.