How to Convert Marks to Grades (A1, A2, B1, B2…)

On a CBSE marksheet, a mark of 84 and a mark of 88 can carry the same grade. That surprises many students, until they understand how conversion works. Grades group marks into bands, so that small differences in marking do not change a student’s grade. This guide explains how to convert marks to grades (A1, A2, B1, B2), what each grade means, and how the conversion differs between boards.

The CBSE Grade Bands

CBSE uses a nine-point scale. The bands, for a subject out of 100, are: A1 for 91 to 100, A2 for 81 to 90, B1 for 71 to 80, B2 for 61 to 70, C1 for 51 to 60, C2 for 41 to 50, D for 33 to 40, E1 for 21 to 32 and E2 for 0 to 20. Each grade has a grade point: A1 is 10, A2 is 9, B1 is 8, B2 is 7, C1 is 6, C2 is 5, D is 4, E1 is 3 and E2 is 2.

To convert marks to grades, find the band the mark falls in. A mark of 76 becomes B1, with grade point 8. A mark of 90 becomes A2, with grade point 9 — one mark short of A1. A mark of 33 becomes D, the lowest passing grade. A mark of 32 becomes E1, which is below the passing standard.

Converting Marks Out of a Different Total

Grade bands are usually given for marks out of 100. If your subject is out of 80, or out of 70, convert the mark to a percentage first, then find the band. For example, 64 out of 80 is 80%, which is B1. A score of 57 out of 70 is 81.4%, which is A2.

For subjects with theory and practical marks, add them first. A student with 54 out of 70 in theory and 26 out of 30 in practicals has 80 out of 100, which is B1. Converting theory and practicals separately, then averaging the grades, gives the wrong result.

Worked Example

Take a student with these marks out of 100: English 89 (A2, 9 points), Hindi 73 (B1, 8 points), Mathematics 95 (A1, 10 points), Science 84 (A2, 9 points) and Social Science 67 (B2, 7 points). The grade points add up to 43, and the CGPA is 43 divided by 5, or 8.6. Notice that the student with 89 in English and the student with 84 in Science both receive A2. The grade does not distinguish between them, but the mark does.

ICSE and State Boards

ICSE also reports grades, but its grade bands and terminology differ from CBSE, and state boards vary again. Some state boards use divisions — first, second and third division — rather than letter grades, while others use a ten-point or seven-point scale. Never apply the CBSE bands to an ICSE or state board marksheet without checking that board’s own scale. Your school or board office can confirm the correct bands for your examination.

Why Grades Are Used

Grades reduce the pressure of a single mark. A difference of two marks in a 100-mark paper may come down to a marker’s judgement on one answer, so grouping marks into bands avoids treating that difference as a real difference in ability. Grades also make it easier to compare students across subjects with different marking patterns.

That said, grades are less precise than marks. For college admissions, most institutions use the percentage calculated from marks, not the grade. Your grade is a useful summary, but your mark is the precise figure a college will check.

Grade Conversion in Practice

When you fill in a form that asks for a grade, copy it exactly from your marksheet. Do not calculate it yourself if your marksheet already shows it, because the board may have applied a rule you do not know about, such as moderation. When a form asks for marks, give the marks. When it asks for a CGPA, calculate it from the grade points on the marksheet, not from the grades you estimated yourself.

Knowing how to convert marks to grades (A1, A2, B1, B2) is straightforward once you know the bands, but always use the bands for your own board and year. A correct conversion protects you from two errors: understating your performance, and overstating it on a form that will later be checked against your marksheet.