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 |
The formula, reversed
This is the JNTUH conversion rule rearranged. The published rule converts CGPA into a percentage:
% of Marks = (CGPA − 0.5) × 10
Solving that for CGPA gives:
CGPA = (percentage ÷ 10) + 0.5
So 79% converts back to (79 ÷ 10) + 0.5 = 8.4. It is the same rule, not a second one — which is why converting a CGPA to a percentage and back always returns the number you started with.
Source: clause 11.2 of the JNTUH R22 B.Tech Academic Regulations.
When you actually need this
Usually one of three situations:
- An application form asks for CGPA but your older marksheet only shows a percentage.
- You want to know what CGPA a job’s percentage cut-off corresponds to — a 60% requirement is a CGPA of 6.5 under this rule, and 70% is 7.5.
- You’re comparing your standing against a friend on a different marking system.
The important caveat
This reverse conversion is an estimate of what your CGPA would be under the JNTUH rule — it is not a substitute for the CGPA printed on your transcript.
If your university uses a different conversion (many do), this will give you the wrong number. And if you already have an official CGPA on a memo, always use that figure, not this one.
Applications generally expect the number as issued by your university. A calculated approximation is for your own planning, not for a form.
Common questions
My result is above 10 — what happened? Any percentage above 95% converts to a CGPA above 10, which is off the scale. The calculator flags this rather than showing an impossible figure.
Can I use this for a non-JNTUH university? Only if your university publishes the same rule. Check its academic regulations first — the guide here explains how to find them.
Does this store my data? No. Everything is calculated in your browser.
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