How this is worked out
A GPA is a credit-weighted average, not a flat one. Each course's grade points are multiplied by its credit hours, those products are summed, and the total is divided by the credits attempted:
GPA = Σ(grade points × credit hours) ÷ Σ(credit hours)
This is why a hand-calculated GPA so often disagrees with a transcript. An A in a 4-credit course and a B in a 1-credit course is not a 3.5 — it is (16 + 3) ÷ 5 = 3.80. A four-credit course moves your average four times as far as a one-credit one.
Scales are institutional. The most common is A 4.0, A− 3.7, B+ 3.3, B 3.0 and so on down to F at 0.0 — but plenty of institutions award no D−, and some use no minus grades at all, running a half-step scale where B+ is 3.5 rather than 3.3. Both are on this page; pick the one your registrar publishes.
Weighted GPA, at high-school level, comes in two shapes that give different answers. An additive bonus adds 0.5 for Honors and 1.0 for AP or IB to every grade in the course. A shifted scale raises the whole table — A becomes 5 in Honors and 6 in Advanced — but leaves D and F alone. Type "Honors" or "AP" into a grade, for example "A (AP)", for the bonus to apply.
A worked example
- Scale
- Standard 4.0 with +/−
- Course 1
- A — 4 credit hours — 16.00 points
- Course 2
- A− — 3 credit hours — 11.10 points
- Course 3
- B+ — 3 credit hours — 9.90 points
- Course 4
- B — 4 credit hours — 12.00 points
- Total credit hours
- 14
- Total grade points
- 49.00
- GPA
- 3.50
- A flat average of the four grades instead
- 3.50 — a coincidence here, and not one you can rely on
- To reach 3.60 with 30 credits left
- an average of 3.65 on the rest
Why the credit weighting matters more than it looks
Students routinely misjudge which courses matter. A one-credit lab and a four-credit seminar feel like two courses; to your GPA they are one course and four courses. Failing the lab costs you a quarter of what failing the seminar does.
It works the other way too. A high grade in a low-credit course barely moves the average, which is worth knowing before spending a weekend chasing one. The leverage is entirely in the credit hours.
This is also why a transcript GPA can look wrong when you sanity-check it in your head. You are almost certainly averaging the letters; the registrar is weighting by credits.
Weighted, unweighted, and what colleges actually use
Most selective colleges recalculate. They strip your school's weighting, apply their own — often counting only academic core courses, sometimes only grades from grades 10 to 12 — and compare the result against everyone else's on the same basis. A 4.7 weighted GPA is not a number an admissions office takes at face value.
The two common weighting conventions genuinely differ. Additive adds 0.5 or 1.0 to each grade in the course. The shifted scale raises the whole table but leaves D and F unbonused, on the reasoning that a poor grade in a hard course is still a poor grade.
Report both figures where you can, and say which convention your school uses. A weighted GPA presented without its convention is an uninterpretable number.
Repeats, withdrawals and pass/fail
Retake policies vary sharply. Some institutions replace the original grade entirely, some average the two attempts, and some keep both on the transcript while counting only the higher. The difference on a single retaken course can be a tenth of a point.
A W for withdrawal usually carries no grade points and no credit attempted, so it does not affect the GPA — but an excessive number of them affects how a transcript reads, and can affect financial aid through satisfactory academic progress requirements.
Pass/fail courses normally sit outside the GPA on the pass side and count as an F on the fail side at some institutions. If you are using pass/fail to protect an average, confirm which of those your registrar does before relying on it.
What "you need X on the rest" is really telling you
The needed-average figure is straightforward arithmetic, and its most useful output is often the word "impossible". If a target would require an average above 4.0 across everything remaining, this page says so rather than printing a number nobody can achieve.
That matters more as you approach graduation. Late in a degree the remaining credits are a small fraction of the total, so the achievable range narrows quickly — and a target that was comfortable two semesters ago can be out of reach without anything obviously going wrong.
Nothing you type here is transmitted anywhere. It is calculated in your browser, and this site makes no external requests at all — which is worth knowing, because a full transcript is a more identifying document than most people treat it as.
Assumptions and sources
- US 4.0 scale
- UNC Chapel Hill Registrar, explanation of the grading system. https://registrar.unc.edu/explanation-of-grading-system/
- US credit weighting
- University of Arizona Registrar, GPA calculation. https://registrar.arizona.edu/records-enrollment/enrollment/grades/grades-and-grade-point-average-gpa-calculation
- US weighted GPA
- St. Johns County School District (additive) and Chicago Public Schools policy 605.13 (shifted scale).
- Scale variation
- Institutions differ at the edges. UNC awards no D−; the University of South Carolina uses a half-step scale with no minus grades at all. Both patterns are available above. checked 2026-08
- Not covered
- Repeat and grade-replacement policies, pass/fail treatment, major GPA versus cumulative GPA, and institution-specific recalculation for admissions.