7 Things That Affect Your GPA Besides Grades

Two students can both earn all A’s and B’s and still end up with different GPAs. Here are 7 factors, beyond the letter grades themselves, that shape your final number.

1. Credit hours per course

GPA is credit-weighted, not simply averaged. A 4-credit A contributes far more to your GPA than a 1-credit A, so your course load’s credit distribution matters as much as the grades themselves. See our full worked example of how GPA is calculated for the exact math.

2. Your school’s grading scale

Most US schools use a 4.0 scale, but some use 4.3 or 5.0 scales, or add plus/minus grades that shift grade points slightly. The same letter grade can be worth a different number depending on the scale.

3. Weighted courses (AP, honors, IB)

Many high schools award extra grade points for advanced courses, meaning a B in an AP class can be worth more than an A in a standard class on a weighted scale.

4. Repeated or retaken courses

Schools vary widely here: some replace the old grade entirely, some average both attempts, and some count both toward your GPA. This policy alone can swing your GPA meaningfully after a retake.

5. Pass/fail or credit/no-credit courses

Most schools exclude pass/fail courses from GPA calculations entirely, even though the credits still count toward graduation requirements.

6. Course withdrawals

Withdrawing before a deadline typically doesn’t affect GPA at all, but withdrawing after that deadline can result in a “W” or even an automatic failing grade at some schools, depending on timing and policy.

7. Transfer credits

Credits transferred from another school often count toward your degree but not toward your GPA at the new school, since the grades were earned under a different institution’s standards.

Once you know how your specific school weighs these factors, plug your actual courses into our GPA calculator for an accurate, credit-weighted result.

Why do two students with the same grades have different GPAs?

Because GPA is weighted by credit hours, not just averaged. A student with more credits in their highest grades will have a higher GPA than someone with the same grades spread across fewer credits.

Does a pass/fail class hurt or help my GPA?

Neither, typically. Most schools exclude pass/fail courses from GPA calculations entirely, so they don’t affect your number either way, though the credits usually still count toward graduation.

Do AP and honors classes always boost my GPA?

Only if your school uses a weighted GPA scale that gives extra points for advanced coursework. On an unweighted scale, an A is an A regardless of course difficulty.