Short answer: SGPA = Σ(credit × grade point) ÷ Σ(credit). Add each subject’s credits and grade point, and the page shows the credit points per subject so a mistyped 3 in place of 4 is visible.
Worked example
Four-credit Maths at grade point 9 is 36 credit points; a one-credit lab at 10 is 10. With five credits in total the SGPA is 46 ÷ 5 = 9.2 — not the 9.5 an unweighted average would give. That gap is why credit-weighted matters.
What this does not decide
- Which grade bands your institution uses — it takes grade points, not marks.
- Whether a failed subject is excluded from the credit total (many universities do exclude it).
- Which percentage formula applies to your form — that is printed in your handbook.
Converting a finished CGPA already? The CGPA converter does that directly, and the percentage calculator handles marks.