Under the JNTUH R22 regulations, a CGPA of 8.5 is 80% of marks.
The working
Clause 11.2 gives the conversion as % of Marks = (final CGPA − 0.5) × 10. So:
- 8.5 − 0.5 = 8.0
- 8.0 × 10 = 80%
Why it is not 85%
This is the single most common conversion mistake, and 8.5 is where people make it most, because 85 looks so obviously right. Dropping the ×10 onto the CGPA directly — 8.5 × 10 = 85 — skips the 0.5 deduction that clause 11.2 puts there.
Five percentage points is not a rounding difference. Plenty of applications filter at 80%, and a few at 85%. Claiming 85 when your university will certify 80 means the number on your resume disagrees with the number on your marks memo, which is the kind of discrepancy that ends an application at the verification stage rather than at the interview.
The other direction of the same error is quieter: people who assume the deduction works the other way and report 75%, underselling themselves by five points against a cut-off they would have cleared.
Check it yourself
Source: JNTUH R22 B.Tech Academic Regulations (official PDF) . Quoted from clause 11.2 of the R22 B.Tech Academic Regulations. Checked 22 August 2026. Always confirm against your own marks memo before using this on an application.
| Grade | Grade points | Marks range |
|---|---|---|
| O | 10 | 90% and above |
| A+ | 9 | 80% to below 90% |
| A | 8 | 70% to below 80% |
| B+ | 7 | 60% to below 70% |
| B | 6 | 50% to below 60% |
| C | 5 | 40% to below 50% |
| F | 0 | Below 40% (Fail) |
| Ab | 0 | Absent |
Values around 8.5
- 8.3 → 78%
- 8.4 → 79%
- 8.5 → 80%
- 8.6 → 81%
- 8.7 → 82%
The full chart, every value from 4.0 to 10.0, is on the conversion table page.
Only if you are at JNTUH
This is JNTUH’s published rule and nobody else’s. Anna University, VTU and Mumbai University each set their own conversion, and the familiar “multiply by 9.5” belongs to CBSE class 10 rather than to any engineering programme. Under a ×9.5 rule the same 8.5 would read as 80.75%, and under a plain ×10 rule as 85% — three different answers from one CGPA, which is exactly why the university’s own document is the only one that counts.
Source: JNTUH R22 B.Tech Academic Regulations, clause 11.2. Clause 11.2 is written for the final CGPA at the end of the programme; a mid-course conversion tells you where you stand, not what will be certified.