IIT Bombay runs a 10-point system that differs from the rest of the IITs in its notation: grades are letter pairs, AA, AB, BB, BC, CC, CD, DD, rather than single letters. The semester average is called the SPI and the cumulative average the CPI, both credit-weighted to two decimal places. Most courses are graded relative to the cohort, so no percentage table exists. The rule most worth knowing is how failures are handled: when you clear a failed course on a later attempt, the CPI reflects only the new passing grade and the earlier FR disappears from the calculation entirely, a genuine grade-replacement policy, and unusually generous.
There are 9 grade tiers. DD is the floor, at 4 points. Administrative codes split two ways. DX counts as zero in the average, while II is left out of the calculation entirely.
The percentage on this page comes from arithmetic. It is not policy. CPI × 10 (convention only; not official IIT Bombay policy) normalises a 10-point scale, which is a reasonable estimate and nothing more. No IIT Bombay-issued conversion formula was found.
A few numbers decide whether you graduate. Minimum CPI, postgraduate is set at 6.00 at the end of each semester. Semester average runs to SPI, Semester Performance Index. Cumulative average runs to CPI, Cumulative Performance Index. Lowest passing grade stands at DD (4 points).
Two things remain unverified here. IIT Bombay publishes SPI/CPI and relative grading rules, but no official CPI-to-percentage formula was verified. A further gap follows the grade table, and neither is filled without a published rule.
Intake to intake, the rules shift. If your transcript disagrees with the 9-grade table above, your transcript wins, and we would rather re-read the source than argue with it.
| Grading mode | Relative for most courses |
| Scale | 0 – 10 (SPI and CPI, to two decimal places) |
| Semester average | SPI — Semester Performance Index |
| Cumulative average | CPI — Cumulative Performance Index |
| Lowest passing grade | DD (4 points) |
| Failing grades | FR (repeat the course) and DX (attendance below the minimum) |
| Repeat policy | Grade replacement — the cleared grade replaces the FR in the CPI |
| Category I standing | CPI of at least 8 with no outstanding FR/DX/DR/W in a core course |
| Minimum CPI — postgraduate | 6.00 at the end of each semester |
| Minimum CPI — undergraduate graduation | No separate figure; every prescribed course must be passed |
| AP grade | Exceptional performance. Only in courses with more than 50 students, capped at 2% of the class, never for projects or seminars |
| Excluded from CPI | NPTEL, SWAYAM and semester-exchange course grades count for credit only |
| CGPA → percentage status | Estimate / normalization only |
We publish these openly rather than filling them with guesses. Help us close one.
IIT Bombay calls the semester average SPI and the cumulative average CPI, both credit-weighted to two decimal places. Grades are letter pairs (AA, AB, BB) rather than single letters, and most courses are graded relative to the cohort, so there is no published percentage table. When a failed course is later cleared, the CPI reflects only the new passing grade. The earlier FR is dropped from the calculation, and a course failed repeatedly still appears only once in both numerator and denominator. Courses taken through NPTEL, SWAYAM or a semester exchange count toward credits but their grades are excluded from the CPI.
| Grade | Points | Meaning |
|---|---|---|
| AP | 10.00 | Exceptional performance. Restricted grade: only in courses with more than 50 registered students, capped at 2% of course strength, never for projects or seminars. |
| AA | 10.00 | Outstanding |
| AB | 9.00 | Excellent |
| BB | 8.00 | Very good |
| BC | 7.00 | Good |
| CC | 6.00 | Average |
| CD | 5.00 | Below average |
| DD | 4.00 | Lowest passing grade |
| FR | 0.00 | Fail — must repeat the course |
| Code | How it is treated |
|---|---|
| DX | Fail due to attendance below the required minimum. Counts as zero, like FR. |
| FF | Fail with re-examination permitted (postgraduate rules). Counts as zero until cleared. |
| II | Incomplete placeholder — converted to a real grade after the semester-end re-examination. Excluded while it stands. |
| PP | Pass in a pass/fail course. Carries no grade points and is excluded from SPI/CPI. |
| NP | Not passed in a pass/fail course. Excluded from SPI/CPI, but the degree requires a PP. |
| AU | Audited course. Excluded entirely. |
| W | Withdrawn. Excluded from SPI/CPI. |
| DR | Position holder pending a decision. Excluded. |
SPI is the credit-weighted average for a single semester. CPI is the same calculation applied cumulatively across every semester since you entered the Institute. IIT Bombay does not use the term CGPA in its regulations. CPI is the equivalent, and it is the figure printed on your transcript.
Both carry 10 grade points. AP is a restricted grade for exceptional performance, awarded only in courses with more than 50 registered students, capped at 2% of that course's strength, and never given for projects or seminars. AA is the ordinary top grade with no such restriction.
No. The CPI reflects the failed status only while the course remains uncleared. Once you pass it on a subsequent registration, the CPI counts only the new grade. Even if you failed the same course more than once, it appears just once in both the numerator and the denominator. This is full grade replacement, not averaging.
IIT Bombay publishes no conversion formula. Its transcripts and degree certificates report the CPI itself, with no percentage equivalent and no class of degree. The widely used convention is CPI x 10, and our converter uses it, but treat it as a convention rather than an official policy, and submit your transcript where an exact figure matters.
No. Courses completed outside IIT Bombay through NPTEL, SWAYAM or a semester exchange count toward your credit total only. The grade is recorded on the transcript but excluded from the SPI and CPI calculation.