How GPA is calculated
GPA is a credit-hour-weighted average of grade points. Each course converts to points on your school's scale, multiplies by its credit hours, and the sum is divided by total credit hours:
GPA = Σ (credits × grade points) ÷ Σ credits
The weighting is the part students often miss. A B+ in a 4-credit course is 12.0 points; a B+ in a 1-credit course is 3.0 points. The letter is identical, the contribution is not — and that is the entire reason GPA is not a simple average of grades.
Worked example
Four courses: A (3 credits, 4.0 points each = 12.0), B+ (4 credits, 3.5 = 14.0), A− (3 credits, 3.7 = 11.1), B (2 credits, 3.0 = 6.0).
Grade points = 12.0 + 14.0 + 11.1 + 6.0 = 43.1. Credits = 3 + 4 + 3 + 2 = 12.
GPA = 43.1 ÷ 12 = 3.592, or 3.59.
A simple unweighted average of the four letter grades (3.925) would have been noticeably higher — the B in a 2-credit course pulled the weighted number down, which is exactly what weighting is supposed to do.
Scales differ, and that is the real problem
There is no universal GPA scale. A 3.5 might be excellent at one institution and mediocre at another.
- 4.0 scale — common in the US. A− is typically 3.7.
- 4.3 scale — used at some institutions to reward A-level work at high schools.
- 5.0 or 10-point scales — common in India, China and much of Asia.
- Percentage only — used in much of Europe and in many high schools.
Converting between a percentage and a GPA is a convention, not a conversion, because the mapping differs by institution. This calculator shows the percentage equivalent of a 4.0-scale GPA using the common linear approximation (GPA ÷ 4 × 100), but the letter-grade table your school publishes is the authority. The grade scale converter makes the same point with the full table.
Cumulative versus term GPA
Your term GPA covers one period; your cumulative GPA covers everything. The cumulative is not a simple average of term GPAs — it is credit-weighted across all terms:
Cumulative = (Σ over all courses of credits × points) ÷ (total credits)
So a strong early term can be diluted by a later weak one, but not equally: 15 credits of 4.0 followed by 3 credits of 2.0 gives a cumulative of 3.6, not 3.5. The weighted grade calculator handles the per-course side of this.
Two things worth knowing about GPA as a signal
Rigour varies by institution. A 3.5 at a school with a hard grading policy may represent more work than a 3.5 elsewhere. Admissions committees read transcripts in context, and so should employers when they ask.
Freshman year is not comparable. First-year grades are often excluded from cumulative averages precisely because they tend to be higher — a well-established convention, and worth asking about if you are near a cut-off.
What GPA does and does not measure
It measures performance across a weighted set of courses over a period. It does not measure how hard the courses were, how much you learned, or whether the skills you gained transfer to the next thing you do. It is a useful summary and a poor substitute for a transcript, which is the same relationship the ROI versus IRR guide describes — one number compressing away the detail it cannot carry.
Frequently asked questions
How do I calculate my GPA?
Multiply each course's credit hours by its grade points, add those up, and divide by the total credit hours. The calculator does this for a term, and can also project the cumulative average afterwards.
What is a good GPA?
It depends on the school and the scale. On a 4.0 scale, 3.5 or above is generally strong, 3.0–3.5 is solid, and below 2.5 is often a problem for graduate admission. The more useful comparison is against your own institution's distribution and the requirement you are aiming at.
Does GPA get rounded?
Institutions differ — some round to two decimals, some truncate, some report exact. Use the method your registrar uses, because a 3.995 reported as 3.99 and as 4.00 can matter at a cut-off. This calculator shows four decimals so you can apply your own rule.
Can I raise my GPA in one term?
Yes, and the effect is bounded by how many credits the term carries. A single excellent term shifts a 15-credit cumulative by roughly (term GPA − current) × credits ÷ total credits. On a 60-credit record, a 4.0 term moves a 3.0 cumulative to about 3.25 — meaningful, but it is arithmetic, not a reset.