How is GPA calculated?

Multiply each course's grade points by its credit hours, add the results, and divide by total credit hours. An A (4.0) in a 3-credit course contributes 12 grade points; quality points ÷ credits = GPA.

What is the difference between weighted and unweighted GPA?

Unweighted GPA uses a flat 4.0 scale regardless of course difficulty. Weighted GPA adds extra points for harder classes — commonly +1.0 for AP/IB (A = 5.0) and +0.5 for honors (A = 4.5) — so the scale can exceed 4.0.

A 3.5 unweighted GPA is strong — it is roughly an A− average and clears the bar at most state universities. Highly selective colleges often admit unweighted averages near 3.9+, where course rigor and context matter more than the raw number.

Do Pass/Fail courses affect GPA?

Usually not. A Pass adds no grade points but typically still counts toward earned credits, which changes total credits and can dilute or preserve your GPA depending on the school's policy.

How do I calculate my cumulative GPA across semesters?

Add up quality points (grade points × credits) across all semesters and divide by total credits attempted. Do not average the semester GPAs — semesters with more credits weigh more.

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How GPA Is Calculated (and Why Students Differ)

Last updated: September 2026 · Independently QA-tested formulas

Quick answer: GPA = Σ(grade points × credit hours) ÷ Σ(credit hours). An A is worth 4.0, B 3.0, C 2.0, D 1.0, F 0. Credits are the weights — a 4-credit A moves your GPA more than a 2-credit A. Weighted scales add +0.5 (honors) or +1.0 (AP/IB) before the math.

Two students both earn A's and B's — one has a 3.8, the other a 3.4. The difference is almost never mystery; it's credits and course mix. The GPA calculator does this instantly, but the hand method takes two minutes and makes transcript checks painless.

The GPA formula

GPA = (Σ grade points × credits) ÷ (Σ credits)

Standard unweighted scale: A=4.0, A−=3.7, B+=3.3, B=3.0, B−=2.7, C+=2.3, C=2.0, D=1.0, F=0. Your school may publish slight variations — use theirs for official numbers.

Worked example: one semester

Worked example: one semester
Course	Grade	Points	Credits	Quality points
Calculus	A	4.0	4	16.0
English	B+	3.3	3	9.9
Chemistry	B	3.0	4	12.0
Spanish	A−	3.7	2	7.4
Total	—	—	13	45.3

GPA = 45.3 ÷ 13 = 3.48. Notice Calculus (4 cr, A) pulled the average up far more than Spanish (2 cr, A−) — that's credit weighting at work.

Weighted vs unweighted

Weighted scales reward rigor:

AP / IB / college-level: A = 5.0, B = 4.0 …
Honors: A = 4.5, B = 3.5 …
Regular: A = 4.0 as before.

A student with straight A's in all-AP courses shows a 5.0 — deliberately above the unweighted ceiling. Colleges recalculate transcripts on their own scale, so a high weighted GPA is a signal, not a guarantee. Cumulative GPA across terms: sum quality points across everything, divide by total credits — never average the term GPAs directly.

What moves your GPA (and by how much)

To lift a GPA, quality points from new courses matter most. Quick math: a 13-credit semester at 3.48 (45.3 points) followed by a 4.0 13-credit semester (52 points) → cumulative 97.3 ÷ 26 = 3.74. One strong term moves it fast early on; later, big swings need big credit loads.

Common GPA mistakes

Averaging term GPAs instead of re-summing quality points.
Forgetting +/− steps — mixing A− (3.7) into an A (4.0) column drifts the result.
Ignoring failed repeated courses — many schools count attempts, not just the best grade; check the catalog.
Comparing weighted to unweighted — a 4.3 weighted ≠ 4.3 unweighted.

Cumulative GPA: re-sum, never average

The most reliable way to get your cumulative GPA is to go back to quality points. Semester 1: 15 credits at 3.40 = 51.0 points. Semester 2: 16 credits at 3.70 = 59.2 points. Cumulative = (51.0 + 59.2) ÷ (15 + 16) = 110.2 ÷ 31 = 3.55. Notice that averaging the two term GPAs (3.40 + 3.70) ÷ 2 = 3.55 happens to match here only because the credit counts are nearly equal — with a 12-credit and an 18-credit term the shortcut breaks. The GPA Calculator re-sums quality points for you across any number of terms.

Also keep in mind that grading scales differ between institutions: some add 0.3 for a plus and subtract 0.3 for a minus, others cap A+ at 4.0, and a few use a 4.33 or 5.0 ceiling. Always recalculate on your school's published scale before comparing yourself to any external cutoff.

Worked example: GPA Calculator at its default inputs

Take the default setup on GPA Calculator: no fields changed, nothing tuned to a nice round number. Run in the site's own engine, those values produce the answer below.

Default inputs
Input	Default
Grades (comma separated, 4.0 scale)	3.5,3.7,4.0,3.3,3.0

Result: GPA: 3.50

The steps behind that answer

Formula: GPA = Sum of grades / Number of courses
Step 1: Sum = 3.5 + 3.7 + 4 + 3.3 + 3 = 17.5
Step 2: Count = 5
Step 3: GPA = 17.5 / 5 = 3.50

Related guides

Credit hours make it a weighted average

A GPA is the sum of grade points times credit hours, divided by total credit hours. A four-credit course therefore moves the average twice as much as a two-credit course, which is why a single heavy course can dominate a semester.

Calculating with equal weights is the most common GPA error, and it usually flatters a semester with one bad heavy course and penalises one with a good heavy course.

Scales are not interchangeable

A 4.0 scale, a 10-point scale and a percentage are different representations, and conversion tables are approximate at best. Employers and universities usually recalculate from transcripts rather than trusting a converted figure.

Report the scale alongside the number. A 3.6 out of 4.0 and a 3.6 out of 5.0 are very different results that look identical without the denominator.

Retakes, withdrawals and pass-fail

Institutions differ on whether a repeated course replaces the old grade, averages with it, or keeps both on the transcript. A withdrawal may or may not affect the GPA while still affecting academic standing.

Read the policy before planning a retake. Replacing a failing grade can lift a GPA substantially; averaging it may barely move it.

Frequently Asked Questions

How much does one B hurt a 4.0?

In a 15-credit semester: (60 − 15) ÷ 15 → one 3-credit B lands you at 57 ÷ 15 = 3.8. Early semesters hurt more precisely because the credit base is small.

Is a 3.5 GPA good for scholarships?

Many merit awards set 3.0–3.5 as thresholds; competitive awards often look at 3.7+. Pair the number with the school's own scale — some publish exactly what they recalculate.

How do I convert percentage to GPA?

There is no universal formula; common US approximations map 90–100% → 4.0, 80–89% → 3.0–3.9 by band. International applicants should use WES-style evaluations rather than DIY tables.

What GPA do I need for grad school?

Common guidance: 3.0 is a floor for many programs, 3.5+ for competitive ones — with research, essays and test scores carrying real weight beyond the number.

Try the calculators

Since GPA is a credit-weighted average, the arithmetic behind it is the same weighted-percentage math used for any score bundle — the percentage guide walks through that math in detail.

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Last updated November 2026