IAT Marks to Rank Conversion
Our 3-segment piecewise exponential regression model, calibrated against official IAT 2025 data, converts your marks to an expected All India Rank (AIR) accounting for score compression in the 120–170 range.
IAT 2026 Rank Predictor, Score Calculator & IISER Admission Probability
Enter your IAT 2026 marks directly or paste your TCS iON response sheet URL for automatic score calculation. Instantly predict your expected AIR, subject-wise breakdown, and IISER admission probability at IISc Bangalore, IIT Madras, IIT Guwahati, and all 7 IISERs — based on real 2025 round-wise cutoff data for GEN, OBC, SC, ST, EWS & PwD categories.
Prediction Settings
/240
Please enter a valid score between 0 and 240.
Rank Compression Warning
The 2025 cycle saw significant score inflation. The model accounts for this tighter competition curve, especially in the 120-170 marks range.
Awaiting Data
Enter your parameters and run the analysis to view comprehensive predictions.
Processing exponential regression model...
Estimated AIR (All India Rank)
--
±5% statistical variance
Category Rank
--
adjusted ratio
Percentile
--%
approximate
Admission Probability Matrix
View Advanced Analytics & Trends
Marks vs Rank Distribution
Category Seat Proportions
Category Advantage Delta
How Our IAT 2026 Rank Predictor Works
With approximately 1.96 lakh aspirants competing for admission to India's premier science research institutes, our data-driven predictor helps you accurately assess your chances at IISERs, IISc Bangalore, and IIT Madras through the IAT (IISER Aptitude Test) channel.
Category-wise IISER Cutoff Comparison
Compare your predicted rank against real 2025 final closing ranks for GEN, OBC-NCL, SC, ST, EWS, PwD, and Kashmiri Migrant categories across all 13 programs at 9 campuses.
Round-wise Counseling Strategy
Understand how cutoffs evolve across 9 rounds of JAC counseling. Know whether you should accept a Round 1 allotment or wait for better options in later spot rounds.
IAT 2025 Final Closing Ranks — General Category (Gender Neutral)
The table below summarizes the official IAT 2025 final closing ranks (last round allotted) under the General / Unreserved category. These figures form the baseline for our IAT 2026 rank predictions.
| Institute / Program | GEN Closing Rank | OBC-NCL | SC | ST | EWS |
|---|---|---|---|---|---|
| IISER Pune (BS-MS) | 1,671 | 1,101 | 563 | 214 | 464 |
| IISER Kolkata (BS-MS) | 4,758 | 3,516 | 1,129 | 675 | 1,005 |
| IISER Kolkata (CDS) | 2,745 | 1,268 | 566 | 217 | 426 |
| IISER Mohali (BS-MS) | 4,939 | 3,680 | 1,186 | 557 | 1,114 |
| IISER Bhopal (BS-MS) | 5,624 | 3,289 | 1,327 | 679 | 1,160 |
| IISER Bhopal (B.Tech) | 3,169 | 1,313 | 797 | 313 | 398 |
| IISER TVM (BS-MS) | 6,506 | 3,171 | 1,472 | 724 | 1,434 |
| IISER Tirupati (BS-MS) | 8,328 | 4,360 | 1,651 | 728 | 1,651 |
| IISER Berhampur (BS-MS) | 8,769 | 4,749 | 1,693 | 802 | 1,883 |
Source: IAT 2025 official round-wise cutoff data (R1–R9). IISc and IIT Madras cutoffs are based on earlier rounds.
How to Use the IAT 2026 Response Sheet Score Calculator
Our response sheet calculator uses the official IAT 2026 answer key to automatically score your paper from your TCS iON response sheet URL. Follow these simple steps:
- Get Your Response Sheet URL — After IAT 2026, log in to iiseradmission.in → My Applications → View Response Sheet. Copy the full HTTPS URL from your browser.
- Switch to Response Sheet Tab — Click the “Response Sheet” tab in the calculator above.
- Paste & Calculate — Paste your URL, select IAT 2026, and click “Fetch & Calculate Score”.
- View Your Analysis — See your total marks, subject-wise breakdown, question heatmap, and instant rank prediction.
IAT 2026 Marking Scheme
| Question Type | Questions | Correct | Wrong | Skipped | Max Marks |
|---|---|---|---|---|---|
| MCQ (Single Correct) | ~60 | +4 | −1 | 0 | 240 |
| Total | 60 | — | — | — | 240 |
What Does Your IAT 2026 Subject-wise Score Mean?
After calculating your score via response sheet or direct input, here’s how to interpret your subject performance for IAT 2026 admissions:
Physics
Score above 40/60 puts you in the top 15% of Physics performers. Mechanics, Electrostatics, and Optics are highest-weightage topics.
Chemistry
Score above 36/60 is competitive. Organic mechanisms and Physical Chemistry numericals dominate IAT papers.
Biology
Score above 44/60 is achievable with NCERT mastery. Biology is considered the highest-scoring section by toppers.
Mathematics
Score above 32/60 is competitive. Calculus, Coordinate Geometry, and Probability carry the most questions.
Frequently Asked Questions — IAT 2026 Rank Predictor & Score Calculator
How accurate is the IAT 2026 marks vs rank predictor?
Our predictor uses a 3-segment piecewise exponential regression model fitted to real IAT 2025 marks-vs-rank data. It accounts for score compression in the 120–170 range and is calibrated against official round-wise closing ranks from R1 through R9. While no predictor can guarantee 100% accuracy (since IAT 2026 exam difficulty and applicant pool may differ), our model provides one of the most statistically robust estimates available.
What is the expected IAT 2026 cutoff for IISER Pune?
Based on IAT 2025 data, the final closing rank for IISER Pune BS-MS under the General category was 1,671 (Gender Neutral). For OBC-NCL it was 1,101, SC was 563, ST was 214, and EWS was 464. While IAT 2026 cutoffs will depend on exam difficulty and candidate pool size, these figures serve as a strong baseline estimate.
Can I get into IISER with IAT rank 5000?
With an IAT rank of 5,000 under the General category, you have strong chances at IISER Bhopal (cutoff 5,624), IISER TVM (cutoff 6,506), IISER Berhampur (cutoff 8,769), IISER Tirupati (cutoff 8,328), and IISER Bhopal Economics (cutoff 5,668). You would also be competitive for IISER Kolkata (cutoff 4,758) through later counseling rounds. Use the predictor tool above to check exact probabilities for your specific category and gender pool.
How many rounds of counseling are there for IAT IISER admissions?
IAT 2025 had 9 rounds of counseling (R1 through R9) conducted by the Joint Admissions Committee (JAC). Rounds 1–4 typically fill most seats at competitive IISERs like Pune, Kolkata, and Mohali. Rounds 5–9 (spot rounds) primarily fill remaining seats at Berhampur, Tirupati, and specialized programs like IISER Bhopal B.Tech and Economics.
What is the difference between IAT category rank and AIR (All India Rank)?
AIR (All India Rank) is your overall rank among all candidates irrespective of category. Category rank is your rank within your specific reservation category (OBC, SC, ST, EWS). For standard reserved categories, admission is primarily based on category rank. However, for PwD and Kashmiri Migrant categories, the official IAT cutoffs use CRL (Common Rank List / AIR) directly.
Which IISERs accept admission through the IAT channel?
All 7 IISERs accept admissions through IAT: IISER Pune, IISER Kolkata, IISER Mohali, IISER Bhopal, IISER Thiruvananthapuram (TVM), IISER Tirupati, and IISER Berhampur. Additionally, IISc Bangalore (BS program), IIT Madras (BS-MS program), IIT Guwahati (BS program), IIEST Shibpur (BS-MS program, with 50% West Bengal State Quota), and IACS Kolkata (BS-MS program) also participate in the IAT-based admission process. Specialized programs include IISER Bhopal B.Tech, IISER Bhopal BS Economics, IISER Kolkata BS-MS CDS, and IISER Tirupati BS Economics.
How to convert IAT 2026 marks to expected rank?
Enter your expected or actual IAT marks (out of 240) in the predictor tool above. Our algorithm uses three distinct exponential segments for different mark ranges: the elite zone (185+), the competitive zone (135–185), and the boundary zone (below 135). Each segment is separately calibrated to capture the non-linear marks-to-rank relationship observed in IAT 2025 results. The predicted rank accounts for the 0.87x global compression factor observed in 2025.
How to calculate IAT 2026 score from TCS iON response sheet?
Visit the PREP4IISER IAT Score Calculator, click the ‘Response Sheet’ tab, paste your official TCS iON response sheet HTTPS URL, select IAT 2026, and click ‘Fetch & Calculate Score’. The tool automatically parses your answers, applies the official marking scheme (+4 correct, −1 wrong for MCQ, 0 for numerical wrong), and shows subject-wise marks for Physics, Chemistry, Biology, and Mathematics.
Where can I find my IAT 2026 response sheet URL?
After IAT 2026 results, log in to the official IISER admissions portal (iiseradmission.in). Navigate to ‘My Applications’ and click ‘View Response Sheet’ under IAT 2026. The response sheet opens on the TCS iON platform (cdn.digialm.com). Copy the complete HTTPS URL from your browser address bar and paste it into the PREP4IISER response sheet calculator.
What is the marking scheme for IAT 2026?
IAT 2026 has 60 questions worth 240 total marks. MCQ (single correct) questions carry +4 for correct and −1 for wrong answers. Numerical answer type questions carry +4 for correct and 0 (no negative marking) for wrong answers. Skipped questions carry 0 marks in all cases.
Can I check my IAT 2026 subject-wise marks before official results?
Yes. Once TCS iON releases the official response sheet (typically 1–2 days after the exam), you can paste your response sheet URL into our IAT Score Calculator to instantly see your Physics, Chemistry, Biology, and Mathematics marks, total score, correct vs incorrect count, and a question-level analysis — even before official results are declared.
How many subjects are in IAT 2026 and how many questions per subject?
IAT 2026 has 4 subjects: Physics, Chemistry, Biology, and Mathematics — with 15 questions each (60 total). Each correct answer gives +4 marks and each wrong MCQ answer gives −1 mark, making the maximum possible score 240. Numerical questions have no negative marking.
Disclaimer
The PREP4IISER IAT Rank Predictor is an independent estimation tool based on historical cutoff data and proprietary regression algorithms. It is not an official tool and is not affiliated with the IISER Joint Admissions Committee (JAC), IISc, or IIT Madras.
The predicted ranks and admission probabilities are statistical estimates meant for guidance only. Actual cutoff ranks and admission decisions depend on official JAC data, candidate performance distribution, and real-time seat availability during the counseling process. Always refer to the official IISER Admissions Website for final decisions.