A "seat matrix" is simply the list of every seat on offer -- by institute, course, specialty, category and quota -- for a given counselling round. If you've only ever seen one round's seat matrix, it's easy to assume it's a fixed number that just gets filled up. It isn't. The seat matrix itself changes from round to round, and reading those changes correctly matters almost as much as reading the matrix itself.
Why the seat matrix changes between rounds
- New seats get added mid-cycle when a college receives fresh recognition or a specialty's intake is increased after Round 1 has already started.
- Seats get removed when a college loses recognition for a course, or when a previously-listed seat turns out to be ineligible.
- Category composition can shift -- a seat allotted as Open in Round 1 doesn't necessarily stay Open if it's vacated and comes back into the pool.
- The pool of unfilled seats shrinks each round, by definition -- Round 2 only offers what wasn't filled (or was vacated) after Round 1, and so on through Round 3 and the Stray Vacancy Round.
What each round actually represents
| Round | What it offers |
|---|---|
| Round 1 | The full initial seat matrix, first allotment |
| Round 2 | Seats vacated or unfilled after Round 1, plus any newly added seats |
| Round 3 | Seats vacated or unfilled after Round 2 -- this is usually the last all-India mop-up round with fresh registration |
| Stray Vacancy Round | A final mop-up of whatever remains after Round 3 (and any state-level processes) -- a much smaller round, filled from a different, later candidate pool |
That last point matters for comparisons: in 2025, Round 3 had allotments across 1,499 institutes versus 743 in the Stray Vacancy Round -- see our full Round 3 vs. Stray comparison for the category-wise breakdown. A rank that clears a seat in the Stray round isn't directly comparable to the same rank in Round 3, because it's a different, later pool of candidates.
Where to check the current seat matrix
NEET-PG Help's Seat Matrix data comes directly from MCC's own published seat matrix and allotment result documents for each round, with every entry linked back to its source PDF. Use the Predictor tab to see seat counts alongside opening/closing ranks by institute and specialty, rather than reading a rank in isolation from how many seats it was actually based on.