CBSE main-subject results in Classes 10 and 12 are reported on a 9-point grading scale, and the headline number parents look for, CGPA, is built directly from it. Three steps get you there.
Step 1 — the 9-point grade
Each main subject earns a grade from A1 down to E. On the board scale these grades are positional: passing candidates are ranked and divided into eight equal groups, so the top eighth get A1, the next B-band, and so on, with E for those who must repeat. (Schools often show an indicative absolute band during the year, roughly A1 = 91–100, A2 = 81–90, and so on, but the final board grade is positional.)
Step 2 — the grade point
Every grade carries a grade point. This is the whole scale, on one screen:
| Grade | Marks range | Grade point | What it tells a parent |
|---|---|---|---|
| A1 | 91–100 | 10 | Top band. Depth, not just recall. |
| A2 | 81–90 | 9 | Strong. Usually one or two careless losses. |
| B1 | 71–80 | 8 | Solid grasp; application questions cost marks. |
| B2 | 61–70 | 7 | Comfortable with the routine, shaky on the new. |
| C1 | 51–60 | 6 | Gaps are specific and fixable. Find them early. |
| C2 | 41–50 | 5 | Foundational chapters need re-teaching. |
| D | 33–40 | 4 | At the pass line. Needs a named intervention. |
| E | Below 33 | — | Essential Repeat examination in that subject. |
Step 3 — average the five subjects
CGPA is the mean of the grade points of the five main subjects. Add the five grade points and divide by five. Additional/elective subjects are excluded from the CGPA.
Converting CGPA to a percentage
CBSE’s indicative conversion is simply percentage ≈ CGPA × 9.5. It is labelled “indicative” precisely because the grades are positional: a clean fixed-marks percentage cannot be recovered from them.
What does not go into CGPA
Co-scholastic areas (Art Education, Health & Physical Education, Work Education and Discipline) are graded on a separate 5-point A–E scale and do not affect CGPA or the indicative percentage. Keeping the scholastic and co-scholastic halves separate is what keeps the report card valid; rolling a co-scholastic letter into the average produces a wrong CGPA.
Because board grades are positional, CGPA cannot be derived from one student’s marks in isolation; it needs the cohort distribution. That is one reason hand-built CGPA so often drifts from the official result. For the marks that feed each subject grade, see Internal Assessment and the periodic-test rule.
See how Relearns computes grades, CGPA and the HPC →