IIT Bombay is followed the marks and result on basis of grade pay. Here the detail for CGPA of IIT Bombay:

For every course taken by a student is assigned a grade based on his/her combined performance over the semester in all the assessments in that course.

These grades are described by the letters AP, AA, AB, BB, BC, CC, CD, DD, FR and DX, each of which not only indicates a qualitative assessment of the student's performance but also carries a quantitative equivalent called the grade point as:

Letter Grade Grade Point

AP 10
AA 10
AB 9
BB 8
BC 7
CC 6
CD 5
DD 4
FR 0 Fail (Repeat the course)
DX Fail (Lack of attendance)
II Incomplete (on health grounds)
DR Dropped
PP Passed
NP Not Passed
AU Audit

Semester Performance Index (SPI)

The performance of a student in a semester is indicated by a number called Semester Performance Index, SPI.

Formula:
SPI= (C1*g1+C2*g2+C3*g3+C4*g4+C5*g5)/(C1+C2+C3+C4+C5)

The SPI is calculated to two decimal places.
The SPI for any semester will take into consideration the FR grades awarded in that semester.

For example if a student has failed in course 4, the SPI will then be computed as:

SPI= (C1*g1+C2*g2+C3*g3+C4*zero+C5*g5)/(C1+C2+C3+C4+C5)

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