Marks to SGPA calculator

This takes one semester’s subject marks, computes the aggregate percentage as total scored over total maximum, and converts that percentage into an SGPA using the inverse of your university formula. It is the fastest way to get a grade-point estimate when your college publishes marks but the form in front of you wants an SGPA.

It is not how your college arrives at the figure. A university assigns a grade point to each subject from marks bands set in the ordinance, then takes the credit-weighted average of those grade points. Two things happen in that process which an aggregate percentage cannot reproduce: each subject is rounded into a band, and each subject is weighted by its credits rather than by its maximum marks. A four-credit paper marked out of 100 and a two-credit lab marked out of 100 count equally here, and unequally on your grade card.

That second point is the one that bites. If your heavy-credit subjects went better than your light-credit ones, this method understates your SGPA; if the reverse, it overstates. When you have the grade points themselves rather than the marks, the SGPA calculator does the credit-weighted arithmetic properly and its answer is the one to trust.

Use this before results are declared, when only marks are available, or as a sanity check on a figure someone has quoted at you. Do not use it to contest a published SGPA — the per-subject arithmetic behind the published number is different, and it is the one that counts.

If you only need the percentage, marks percentage stops there. For the cumulative figure across semesters, SGPA to CGPA takes it further.