GPA vs CGPA: what is the difference?
A GPA usually describes a single term — one semester's average. A CGPA (cumulative grade point average) describes your whole program so far: every semester combined into one number. Employers, scholarship committees and graduate schools almost always look at the cumulative figure, because it reflects sustained performance rather than one good (or bad) term. This calculator builds your CGPA from up to eight semester GPAs and their credit loads, and works on both the 4.0 scale common in the US and the 10.0 scale used by many Indian universities.
The CGPA formula
Each semester contributes weighted points — its GPA multiplied by its credits. Add the weighted points of all semesters and divide by the total credits. This calculator uses that weighted method, which is how registrars compute an official CGPA from course-level records.
Why a simple average of semester GPAs is wrong
Semesters rarely carry identical credits. A 3.9 in a light 12-credit semester and a 3.4 in a heavy 18-credit semester do not average to 3.65: the weighted result is (3.9 × 12 + 3.4 × 18) ÷ 30 = 3.60, because the heavier semester rightly counts for more. The gap looks small in one step, but across eight semesters with internships, electives and varying loads, a simple average can drift a tenth of a point or more from the official figure — enough to matter at a scholarship cutoff. If every one of your semesters carried exactly the same credits, the simple and weighted averages would agree; otherwise, always weight.
The scale and percentage notes
On the 10.0 scale, this calculator also shows an estimated percentage using the multiplier × 9.5 — the conversion many Indian universities and boards publish for turning CGPA into an indicative percentage. It is an estimate, not an official conversion: some institutions use × 9.5, others use different formulas or forbid conversion entirely, so check your own university's rules before quoting a percentage. On the 4.0 scale, the percentage shown is only a rough linear equivalent (CGPA ÷ 4 × 100), included for orientation; most institutions on the 4.0 system never convert GPA to a percentage at all.
Worked example
Three semesters: 3.5 over 15 credits, 3.7 over 15 credits and 3.8 over 16 credits. Weighted points are 52.5 + 55.5 + 60.8 = 168.8, over 46 credits, so the CGPA is 168.8 ÷ 46 = 3.67. A simple average of the three GPAs would give (3.5 + 3.7 + 3.8) ÷ 3 = 3.67 as well here — the two methods only separate when credit loads differ more, which is exactly when the weighted method matters.
How to use this calculator
- Choose your GPA scale — 4.0 or 10.0 — so the percentage estimate uses the right conversion.
- Enter each semester's GPA and the credits you earned that semester, one row per semester.
- Leave semesters you have not completed at 0; rows with 0 credits or 0 GPA are ignored.
- Read your CGPA in the green panel and check the per-semester table to see each term's contribution.
- Use the percentage figure only as an estimate, and confirm your institution's own conversion rule before reporting it officially.
How much can one semester move your CGPA?
Less and less as you progress — that is the mathematics of a cumulative average. Early on, with few credits banked, a strong semester can lift your CGPA noticeably; by the final year, the same semester might move it by only a few hundredths. To plan ahead, enter your completed semesters plus a realistic target GPA for the remaining ones and see where you land. If you need a single course's grade worked out first, start with the GPA Calculator for the term itself, then bring the term result back here.