What to do if your university uses a non-linear grading scale
Some universities do not use a simple linear relationship between marks, grades and percentages. Instead they use bands — ranges of marks that map to a grade — which can make conversions non-linear and resistant to a single multiplier.
What non-linear means here
On a linear scale, percentage = CGPA × a constant. On a band-based scale, different CGPA ranges may convert differently, because each grade band covers a span of marks and the “representative” percentage is not a straight multiple. A flat formula misstates the result.
How to convert correctly
For a band-based university, you need its published conversion table, not a multiplier. Our CGPA to percentage calculator handles this: universities with band tables or batch-specific rules have those encoded on their page, with the source cited, so the conversion respects the actual bands.
Why the official document matters
Because non-linear schemes vary so much, an aggregator's generic formula is especially likely to be wrong for them. The university's own circular or ordinance is the only reliable source — see our guide on finding your official conversion circular.
Calculating the CGPA itself
The CGPA calculation (credit-weighted average of grade points) is still standard even when the percentage conversion is non-linear. Compute your CGPA normally on the CGPA calculator; the non-linearity only affects the percentage step.
How to tell if your scale is non-linear
A quick test: take two CGPA values your university has published percentages for and check whether the ratio percentage÷CGPA is the same for both. If it is, the scale is linear (a single multiplier works). If the ratio shifts — say 9.4% per point low on the scale but 9.7% higher up — it's band-based and non-linear, and only the published table converts it correctly.
Key takeaways
- Band-based scales convert different CGPA ranges differently — no single multiplier fits.
- You need the published conversion table, not a formula.
- The converter encodes band tables where they apply, with sources.
- The CGPA calculation itself stays standard; only the percentage step is non-linear.