Guide · GPA & credit hours
Weighted GPA Calculator
Updated: June 2026
A grade point average is a weighted average in disguise. Every course contributes a grade, but a four-credit course should count more than a one-credit elective — and the credit hours are exactly the weights that make that happen. Understanding the mechanics lets you compute your GPA yourself and see precisely how a single class moves it.
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GPA is a weighted average
First, each letter grade becomes grade points on a scale, usually A = 4.0, B = 3.0, C = 2.0, D = 1.0, F = 0. Then you weight those points by credit hours:
The product of grade points and credits is called quality points. Sum the quality points across all courses, divide by total credits, and you have your GPA. It is the weighted average formula with credit hours as the weights — nothing more.
A worked semester
| Course | Grade | Points | Credits | Quality points |
|---|---|---|---|---|
| Calculus | A | 4.0 | 4 | 16.0 |
| Chemistry | B | 3.0 | 4 | 12.0 |
| History | A | 4.0 | 3 | 12.0 |
| Seminar | C | 2.0 | 1 | 2.0 |
| Total | 12 | 42.0 |
The GPA is 42.0 ÷ 12 = 3.5. The weak C only dents it slightly because it is a single credit; had it been a four-credit course, the same C would have pulled the GPA down to about 3.1. That is the credit weighting at work.
Weighted vs unweighted GPA
The word "weighted" carries a second meaning in high schools. An unweighted GPA caps every course at 4.0 regardless of difficulty. A weighted GPA adds bonus points for honors or AP classes — often +0.5 or +1.0 — so an A in AP Biology might score 5.0. You can model that here by entering the boosted point value as the grade and the credits as the weight. Either way, the credit-hour weighting still applies on top.
Cumulative GPA across terms
To combine semesters, don't average the two GPAs directly unless they carry the same credits. Instead, total all quality points and all credits across every term and divide once. A 3.8 over 15 credits and a 3.2 over 18 credits give (3.8×15 + 3.2×18) ÷ (15 + 18) = (57 + 57.6) ÷ 33 = 3.47 — closer to the larger, lower term. Averaging 3.8 and 3.2 to 3.5 would overstate it.
Using the calculator for GPA
- Value = the grade points for each course (4.0, 3.0, and so on).
- Weight = the credit hours.
- Pass mark = your school's minimum GPA, such as 2.0, to flag good standing.
- Grade still needed = how many points a remaining course must earn to hit a target GPA.
Frequently asked questions
How is GPA a weighted average?
It multiplies each course's grade points by its credit hours, sums those quality points, and divides by total credits — the weighted average formula with credits as weights.
What is the difference between weighted and unweighted GPA?
An unweighted GPA caps every course at 4.0. A weighted GPA can add points for honors or AP courses, and credit-hour weighting makes heavier courses count more.
How do I combine GPAs from two semesters?
Add all quality points and all credits across both terms, then divide once. Don't average the two GPA figures unless the credit totals match.
Does a one-credit course really matter less?
Yes. Its influence on your GPA is proportional to its credits, so a single-credit class moves the average far less than a four-credit one.