Short answer. There is no single formula. CBSE uses 9.5 x CGPA, VTU uses (CGPA - 0.75) x 10 and JNTUH uses (CGPA - 0.5) x 10. At a CGPA of 8.0 these give 76%, 72.5% and 75%.
Why one CGPA has many percentages
A CGPA is a weighted average of grade points. A percentage is an average of marks. The two are not the same thing, so no exact conversion exists. Several universities say this in their own documents. The University of Mumbai calls its formula an approximate representation. KTU says that no general formula can be defined. IISc calls its rule notional.
Each board or university picks a rule and publishes it. The rules fall into a few families.
The main families of formula
A plain multiplier. CBSE uses 9.5 x CGPA. IKGPTU names a factor of 10. IISc uses 10 on its 10-point scale and 12.5 on its 8-point scale.
A subtraction, then 10. VTU uses (CGPA - 0.75) x 10. JNTUH and DBATU use (CGPA - 0.5) x 10. A KTU proceeding of 2017 used 10 x G - 3.75.
A multiplier plus a constant. The University of Mumbai uses 7.25 x CGPI + 11 for its 10 point system. Dibrugarh University uses 10 x CGPA + 5 for a band of post graduate students.
How to pick the right formula
Use the rule of the body that issued your CGPA. If you studied at a college affiliated to a university, use the university's rule, not the college's. Check the scheme or regulation year too, because rules change. KTU, for example, replaced one B.Tech formula in 2023.
If your marksheet prints a percentage, use that number. If the university office will give a certificate, use the certificate. A tool like this one is for planning and for forms that allow an estimate.
Why we dropped some universities
We include a university only when we could open a primary document and read the formula. We left out several well-known names because we found only calculator websites, which disagree with each other. Better no page than a wrong one.
Next steps
If you need a US GPA, see the CGPA to GPA converter. It explains why an evaluator's number can differ from a simple conversion.
Worked example
Example. A student has a CGPA of 8.0 and asks what the percentage is.
The answer depends on the university. Under VTU, (8.0 - 0.75) x 10 = 72.5%. Under JNTUH, (8.0 - 0.5) x 10 = 75%. Under CBSE, 9.5 x 8.0 = 76%. Under IKGPTU, 10 x 8.0 = 80%.
Same CGPA, four answers. Use your own university's rule.
University formulas we have checked
Each row links to a page with the formula, the source document and a worked example. Sources were read on 2026-10-10.
| Board or university | Formula | Source |
|---|---|---|
| CBSE (Class 10) | Percentage = 9.5 x CGPA | CBSE Circular No. 24, 28 May 2010 |
| Visvesvaraya Technological University (VTU) | Percentage = (CGPA - 0.75) x 10 | VTU regulations for BE/B.Tech under OBE and CBCS, 2018-19, clause 18OB 7.1 |
| Jawaharlal Nehru Technological University Hyderabad (JNTUH) | Percentage = (CGPA - 0.5) x 10 | JNTUH R22 B.Tech revised academic regulations, clause 11.2 |
| APJ Abdul Kalam Technological University (KTU) | Percentage = 10 x CGPA (B.Tech 2019 scheme, from the 2023 order) | KTU order U.O.No. 1584/2023/KTU, 29 June 2023 (copy); KTU Proceedings No. KTU/AR(ACADEMIC-1)/1509/2016, 17 May 2017 (copy) |
| University of Mumbai | Percentage = 7.25 x CGPI + 11, rounded to the next full integer | University of Mumbai circular, Oct 2018 (copy); University of Mumbai circular, 19 June 2017 (copy) |
| Dr. Babasaheb Ambedkar Technological University (DBATU) | Percentage of Marks = (CGPA - 0.5) x 10 | DBATU First Rules and Regulations, July 2016 (copy) |
| Indian Institute of Science (IISc), Bangalore | Percentage = 10 x CGPA on the 10-point scale, or 12.5 x CGPA on the 8-point scale | IISc notification Ref. IISc/Acad/CGPA-Conversion/2021, 14 October 2021 |
| Dibrugarh University | Percentage = 10 x CGPA + 5 for CGPA of 5.5 or more (maximum 100); Percentage = 10 x CGPA for CGPA from 4.5 to below 5.5 | Dibrugarh University notification DU/DR-A/8-1/122AC/21/625, 24 May 2021 |
| I.K. Gujral Punjab Technical University (IKGPTU) | Percentage = 10 x CGPA (multiplier factor 10) | IKGPTU notice: implementation of multiplier factor 10 for conversion of CGPA to percentage |
Why the answers differ
Take a CGPA of 8.0 on a 10-point scale. The rules in this series give: CBSE 76%, VTU 72.5%, JNTUH 75%, KTU 80%, Mumbai University 69%, DBATU 75%, IISc 80%, Dibrugarh University 85%, IKGPTU 80%. The gap between the lowest and the highest is more than 15 points. That gap is why you should never use another university's formula.
We left out universities when we could not read a primary document. A formula quoted on a calculator website is not enough for us. If your university is missing, tell us and send the circular.
Questions
What is the formula to convert CGPA to percentage?
There is no single formula. CBSE uses 9.5 x CGPA. Many universities use a form of 10 x CGPA with a subtraction. Use the rule of the board or university that gave you the CGPA.
Is CGPA x 9.5 correct?
It is correct for CBSE Class 10, under CBSE Circular 24 of 2010. It is not a rule for all universities.
Why do two websites give me different percentages?
Because they use different formulas. Some tools use one rule for every university. The page for your own university links the source document.
Can I convert a percentage back to CGPA?
You can reverse the formula of your university. For VTU, CGPA = percentage / 10 + 0.75. The result is only as good as the formula.
Which universities are on this site?
CBSE, VTU, JNTUH, KTU, Mumbai University, DBATU, IISc, Dibrugarh University and IKGPTU, each with a linked source.
Is the result official?
No. It is an estimate. Only your university can give an official percentage.
Last checked by the StudyCount team.