GPA Calculator
List your courses as letter grade and credit hours, pick your school's scale, and get your credit-weighted GPA, total credit hours, and total quality points at once.
How this calculation works
Each course contributes "quality points" equal to its grade point value multiplied by its credit hours — a 4-credit A is worth more than a 1-credit A. The calculator parses each entry as grade:credits, separated by commas or line breaks.
Your GPA is the sum of all quality points divided by the sum of all credit hours: GPA = Σ(grade points × credits) ÷ Σ(credits). This is why GPA is a credit-weighted average, not a simple average of your letter grades.
Grade points are looked up from the scale you choose. The 4.0 and 4.3 scales use the familiar plus/minus tiers (A, A-, B+, …); the 4.5 scale — common at many Korean universities — uses whole-point tiers without minus grades.
Worked example
Grade-point conversion table
Each scale converts a letter grade to a point value differently. Entries with a dash aren't recognized on that scale and are skipped.
| Grade | 4.0 scale | 4.3 scale | 4.5 scale |
|---|---|---|---|
| A+ | 4.0 | 4.3 | 4.5 |
| A | 4.0 | 4.0 | 4.0 |
| A- | 3.7 | 3.7 | — |
| B+ | 3.3 | 3.3 | 3.5 |
| B | 3.0 | 3.0 | 3.0 |
| B- | 2.7 | 2.7 | — |
| C+ | 2.3 | 2.3 | 2.5 |
| C | 2.0 | 2.0 | 2.0 |
| C- | 1.7 | 1.7 | — |
| D+ | 1.3 | 1.3 | 1.5 |
| D | 1.0 | 1.0 | 1.0 |
| D- | 0.7 | 0.7 | — |
| F | 0.0 | 0.0 | 0.0 |
Semester GPA vs. cumulative GPA
- Semester GPA weights only the courses taken in one term — it shows how you're doing right now.
- Cumulative GPA weights every course you've ever taken toward your degree, so one rough semester moves it less than it moves a single-term GPA.
- To get cumulative GPA here, list every course from every semester in one go — credit-weighting handles the rest automatically.
- Most transcripts and grad-school applications ask for cumulative GPA, while academic-probation and dean's-list decisions often look at the semester figure too.
How to raise your GPA
- Prioritize your highest-credit courses — a strong grade in a 4-credit class moves your GPA more than the same grade in a 1-credit seminar.
- Retake courses where your school allows grade replacement; a repeated course can remove or offset a low grade in the cumulative calculation.
- Balance a demanding course with a lighter one in the same term so a difficult grade doesn't dominate that semester's credit-weighted average.
- Check whether your school excludes pass/fail, audited, or withdrawn courses from GPA — strategically using those options can protect your average when you're stretched thin.
- Remember cumulative GPA gets harder to move as total credits grow, so the earliest semesters carry the most leverage — and the most risk.
Why GPA is credit-weighted, not a simple average
A simple average of your letter grades would treat a 1-credit pass/fail seminar the same as a 4-credit core course, which doesn't reflect how much work — or how much of your degree — each one represents. Weighting by credit hours means courses that carry more of your workload also carry more weight in the final number.
This is also why one bad grade in a small elective hurts far less than the same grade in a heavy course load, and why comparing GPAs across students only makes sense when the underlying credit structures are similar.