GPA Calculator

What GPA means

Grade point average (GPA) is the standard summary of academic performance in many U.S. high schools, colleges, and universities. It is not a simple average of letter grades: each course is weighted by its credit hours (or Carnegie units), so a 4-credit class moves your GPA twice as much as a 2-credit class with the same letter.

That credit-hour weighting is not the same thing as AP / Honors / IB “weighted GPA.” This calculator computes a credit-weighted average on a selectable letter-to-points scale.

Grading systems differ by country, campus, and even by program. There is no universal GPA standard. This calculator’s default map is a widely used U.S. plus/minus table with A+ = 4.33 — published as such by Columbia and the University of Iowa. Princeton, UC Berkeley, and Penn publish A+ = A = 4.0. Choose a 4.33 or 4.0 reference scale, then optionally overlay a Custom A+ value (A+ only; other letters stay on that selected map). Example: a 4.3 / 3.7 / 3.3 program map is 4.0 scale + Custom A+ 4.3, not Custom A+ on the 4.33 map. A full custom letter map is not offered yet. The sources below demonstrate common conventions; they do not certify a single correct table.

How to calculate GPA

1. Convert each letter grade to grade points gᵢ using your scale.
2. Multiply by course credits cᵢ to get quality points: cᵢ × gᵢ.
3. Sum quality points and sum credits (default policy: skip P / NP / I / W unless your school says otherwise).
4. Divide:

GPA = Σ (cᵢ × gᵢ) / Σ cᵢ

The same result can be written with normalized weights wᵢ = cᵢ / Σ c:

GPA = Σ (wᵢ × gᵢ)

Worked example (letter grades)

GPA = 35.32 ÷ 9 = 3.924 (often rounded to 3.92 on transcripts)

On the 4.0 scale the same letters become (4×4.00 + 2×3 + 3×4) ÷ 9 = 3.778, because A+ is capped at 4.00.

Worked example (numeric / point entry)

GPA = 26 ÷ 9 = 2.889

Cumulative GPA and prior semesters

To fold in past work, treat prior results as one lumped course:

Cumulative GPA = (prior GPA × prior credits + new quality points) / (prior credits + new credits)

Use the Prior GPA and Prior credits fields in Courses mode, or compute new quality points first and then combine.

GPA planning (raising or protecting GPA)

If you already have cumulative GPA G over C credits and want target T after taking A more credits, the average you need on those new credits is:

Need = (T × (C + A) − G × C) / A

Planner status is defined from Need and the selected scale maximum GPAₘₐₓ:

• Secured if Need ≤ 0 — the target stays met even if upcoming credits earn 0 GPA.
• Attainable if 0 < Need ≤ GPAₘₐₓ — upcoming credits must average at least Need.
• Unreachable if Need > GPAₘₐₓ — not reachable with the planned additional credits.

If Need is above GPAₘₐₓ, the result also reports the minimum additional credits that would make the target reachable at that cap — except when the target equals GPAₘₐₓ while current GPA is below it. Then no finite credit load can hit the exact target; the cumulative GPA can only approach the cap.

The planner applies this identity against the currently selected scale, not a hidden 4.33 assumption.

Weighted vs unweighted, AP / IB / Honors

• Credit-weighted (this tool): each course is multiplied by its credit hours on a 4.33 or 4.0 map, with an optional Custom A+ overlay.
• AP / Honors / IB weighted: schools add 0.5–1.0 (or more) extra grade points. That is a different policy. Enter the transcript grade points, not a guessed letter, when policies differ.
• Repeats / forgiveness: some schools replace the old grade; others average both. Official policy always wins over any web calculator.

Practical ways to improve GPA (high leverage)

These beat generic “study harder” advice because they change the math of GPA or the odds of high gᵢ:

1. Protect high-credit courses. A drop from A to B in a 4-credit class costs more than the same drop in a 1-credit lab.
2. Front-load recovery early. Raising GPA is easier with fewer completed credits; the same A later moves the average less.
3. Use the planner before registration. If you need 4.2+ on next term’s credits, adjust course load or target before you commit.
4. Know repeat / withdrawal rules. A strategic W or grade replacement can matter more than marginal study gains — ask advising.
5. Balance difficulty and credits. Overloading may lower several gᵢ at once; a sustainable schedule often yields a higher Σ(c×g).
6. Attend assessment-aligned classes. Missing changes to exam scope or grading rubrics is a common preventable GPA hit.
7. Track running totals monthly. Keep a private quality-point ledger so surprises show up before finals week.

Modes in this calculator

• Courses — row-by-row credits and letter grades, add/remove courses, optional prior GPA, selectable GPA scale.
• Quick totals — when you already know Σ quality points and Σ credits.
• GPA planner — required average on upcoming credits for a target cumulative GPA, with secured / attainable / unreachable status against the selected scale maximum.

Empty inputs produce no GPA (displayed as —), not NaN. Results are for planning and advising only. Your school’s SIS / registrar remains the official source.

These registrar pages demonstrate common grading conventions, not a universal GPA standard:

• Columbia / Iowa support the default 4.33 table (A+ = 4.33).
• Princeton / Berkeley / Penn support the 4.0 capped-A+ table (A+ = A = 4.00).
• UNC shows that policy can still vary by program (for example A+ = 4.3 with A− = 3.7), which is why Custom A+ overlays the selected 4.0 or 4.33 base instead of replacing the whole table.

Your institution’s registrar policy takes precedence.