The short version: SGPA is one semester's credit-weighted average. CGPA is the same average taken across every semester you have finished. GPA is usually that cumulative figure again, reported on a 4.0-style scale for institutions outside India. The difference between SGPA and CGPA is scope, not method, since both weight your grade points by credits, one over a semester and one over a degree.
The difference at a glance
| SGPA | CGPA | GPA | |
|---|---|---|---|
| What it covers | One semester | Every completed semester | Usually everything, on another scale |
| Typical scale | 10-point | 10-point | 4.0, sometimes 4.3, 5.0 or 7.0 |
| Where it appears | Semester grade card | Consolidated transcript | US and international transcripts |
| How it is built | Credits × grade points, per course | Credits × grade points, across semesters | Same idea, different scale |
| Changes when | That semester is published | Every new semester | The underlying record changes |
| Who asks for it | Internal progression, some scholarships | Indian employers, PG admissions | Foreign universities and portals |
What does SGPA measure?
SGPA stands for Semester Grade Point Average, and it describes one semester and nothing else. Each course's grade point is multiplied by that course's credits, those products are added, and the total is divided by the semester's credits:
SGPA = Σ(grade point × credits) ÷ Σ(credits)
So a semester of four courses does not average four grades. It averages them in proportion to how much each course was worth, which is why a strong result in a two-credit lab moves your SGPA far less than the same result in a four-credit core paper.
If your result card prints SGPI rather than SGPA, nothing has changed except the label. Some universities, Mumbai among them, use Semester Grade Performance Index for the same figure. The number you see is that semester's summary, and it does not include anything from earlier terms.
What does CGPA measure?
CGPA stands for Cumulative Grade Point Average and applies the identical weighting one level up, across every semester you have completed. Each semester contributes in proportion to its credits, so a heavy semester pulls harder than a light one.
CGPA = Σ(SGPA × semester credits) ÷ Σ(credits)
This is where the most common misunderstanding lives. Your CGPA is not the average of your SGPAs. It only works out that way when every semester happens to carry an identical credit load, which is rare once labs, electives and project semesters enter the picture. On the transcript below, averaging the four SGPAs gives 7.80 while the correct CGPA is 7.70, so the shortcut overstates this student by 0.10, because their weakest semester was also their heaviest.
What does GPA measure, and which GPA is it?
GPA simply means Grade Point Average, and on its own it does not say which scale it sits on. In US usage it almost always means a cumulative figure on a 4.0 scale, which makes it the closest equivalent of an Indian CGPA rather than of a single SGPA. But 4.0 is not universal: some institutions run 4.3 to accommodate an A+, several use 5.0, and Australian universities commonly use 7.0.
That ambiguity is the practical risk. A GPA of 4.0 is a perfect score on one scale and 80% of the range on another, so a number reported without its scale is not information. When an Indian student converts a CGPA for a foreign form, the usual estimate is GPA = (CGPA ÷ 10) × 4, a rescaling rather than an official conversion, and one that credential evaluators do not use. They work from your individual course grades instead.
What do all three numbers look like on one transcript?
Definitions only go so far, so here is one student's actual record: four semesters, a different credit load each term, and the running CGPA after each set of results. Every figure in the table comes from the same credit-weighted formula, applied at a different scope.
| Semester | SGPA | Credits | CGPA so far |
|---|---|---|---|
| Semester 1 | 7.4 | 22 | 7.40 |
| Semester 2 | 8.1 | 20 | 7.73 |
| Semester 3 | 6.9 | 26 | 7.41 |
| Semester 4 | 8.8 | 18 | 7.70 |
Watch semester three. The SGPA drops to 6.9, and because that term carried the heaviest credit load of the four, the running CGPA falls further than the single result alone suggests. Semester four is the student's best at 8.8, but it is also their lightest at 18 credits, so it lifts the cumulative figure only part of the way back.
Now the same record expressed every way an application might ask for it:
| Metric | Value | What it reflects |
|---|---|---|
| SGPA (latest semester) | 8.8 | One semester only |
| CGPA (all four semesters) | 7.70 | Credit-weighted across 86 credits |
| Percentage (AICTE ×9.5) | 73.15% | First Class |
| Percentage (×10 convention) | 77% | Same transcript, different university rule |
| GPA (4.0 scale estimate) | 3.08 | Unofficial rescaling for foreign forms |
Every one of those describes the same student. The latest SGPA of 8.8 converts to 83.6% on its own, which is almost ten points above the 73.15% their full record supports, a gap worth knowing about before you quote the flattering number on a form.
Which number does each application ask for?
This is the decision most readers actually arrived to make. The unit varies more than the arithmetic does.
| Application | Usually asks for | Watch out for |
|---|---|---|
| Campus placements | CGPA, often with a minimum and no backlogs | Some firms filter on tenth and twelfth marks too |
| National Scholarship Portal schemes | Percentage, occasionally CGPA | The unit is set per scheme, so read the notification |
| Government and PSU notifications | Percentage, sometimes with an official conversion certificate | A self-calculated figure is often rejected |
| Indian PG admissions | CGPA or percentage, depending on the university | Check which unit the eligibility clause uses |
| Foreign universities | GPA on a 4.0 scale, plus the transcript | Many also require a credential evaluation |
| UK universities | Percentage or degree class | A GPA is usually the wrong unit |
Two habits save trouble. Report the unit the form names rather than the one that looks strongest, and write the scale beside any grade point figure you enter. Where a percentage has to be defensible rather than indicative, request an official conversion from your examination cell instead of quoting a calculated one, including one from this site. Scheme-specific requirements are published on the National Scholarship Portal, and foreign institutions usually route through an evaluator such as WES.
Common mistakes
- Averaging SGPAs to get a CGPA. Right only when every semester carried equal credits, and wrong by a widening margin when it did not.
- Assuming ×9.5 is universal. It is the AICTE convention, not a national rule, and universities on ×10 publish a different percentage from the same CGPA.
- Reporting a converted GPA where the form wanted the transcript figure. A reader can convert your CGPA; they cannot un-convert your GPA.
- Comparing CGPAs across universities as though they mean the same thing. The grade-point bands underneath can differ.
- Quoting your best semester's SGPA when the question asked for the cumulative figure.
Calculate your own numbers
- SGPA to CGPA calculator: combine your semester results into a credit-weighted CGPA.
- GPA calculator: build a semester figure from individual course grades and credits.
- SGPA to percentage calculator: convert one semester under your university's formula.
- CGPA to percentage calculator: convert the cumulative figure.
- CGPA to GPA calculator: the 4.0-scale estimate, and what evaluators do with it.
- How to improve your CGPA: what the credit weighting means for raising the number.