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If you are a UPSC aspirant in the preparation phase or have appeared for the prelims, you often need to calculate UPSC prelims negative marking for both GS and CSAT.
Many students do it manually, but for any error-free confirmation of your marks, you should use an online UPSC Marks Calculator.
Our UPSC Prelims negative marking calculator was built for that exact purpose.
What is UPSC Marks Calculator?
A UPSC Marks Calculator is a digital tool designed for Civil Services aspirants to estimate their Prelims score. It eliminates manual math by automatically applying the official UPSC 1/3rd negative marking rule to both papers:
- GS Paper I: Evaluates 100 questions. It awards +2.00 marks for every correct answer and deducts -0.666 marks for every incorrect attempt.
- CSAT Paper II: Evaluates 80 questions. It awards +2.50 marks for every correct answer and deducts -0.833 marks for every incorrect attempt.
Note: To avoid rounding errors that could affect edge-case cutoffs, our calculator processes the exact mathematical fractions (2/3 and 2.5/3) in the background rather than flat decimals.
UPSC Prelims Marking Scheme
UPSC conducts its Civil Services examination in three stages: Preliminary, Mains, and Interview. Among these three, only the Preliminary exam has negative marking. For the UPSC Civil Services Prelims Exam, a 1/3 negative marking applies. The preliminary exam is divided into two parts - GS Paper I and CSAT. Below is the marking scheme for both of these papers.
| Paper | Duration | Total Questions | Marks Per Question | Negative Marking | Max. Marks | Nature |
|---|---|---|---|---|---|---|
| GS Paper I | 2 hours | 100 | +2 | 1/3 | 200 | Merit Based |
| CSAT | 2 hours | 80 | +2.5 | 1/3 | 200 | Qualifying |
UPSC Prelims Negative Marking Formula
To calculate the negative marking for both papers in the preliminary exam, you should first calculate your total positive marks and then subtract the total negative marks from that. Below is the formula:
How to calculate negative marks in UPSC prelims?
As we know, Prelims have two papers. The calculation of the marks of these two papers is slightly different. Below we have provided the calculation for the GS Paper and CSAT.
UPSC Prelims GS Marks Calculator
The Prelims GS Paper has 100 questions in total. Every correct answer carries 2 marks, whereas every wrong answer deducts -0.66 marks (which is exactly 1/3rd of 2).
Let us understand it with an example: Say you attempt 85 questions. You get 60 right and 25 wrong.
The GS Paper I score is 103.34.
UPSC CSAT Marks Calculator
The CSAT Paper is slightly different. It consists of fewer questions, a total of 80 questions. Every correct answer carries +2.50 marks, whereas every wrong answer deducts -0.83 marks (which is exactly 1/3rd of 2.5)
Follow the example below to understand it.
Let us say you attempt 45 questions in the CSAT paper, getting 35 right and 10 wrong:
CSAT is a qualifying paper, so you do not need to score 150 here. You only need to score the passing marks, which is 66 (33%) out of 200.
Previous years' cut-off for UPSC Prelims GS
Once you have your marks, you can compare them to the previous years' cut-off. This will give you the idea of where you stand in your preparation or in the merit list if you have appeared for the prelims, and help you plan better for the next step.
However, you should always be careful because the cut-off varies every year. One year, 80 marks could be a good score, but in another year, it may not get you on the list.
Below is the previous year's cut-off:
| Category | 2025 Cutoff | 2024 Cutoff | 2023 Cutoff | 2022 Cutoff | 2021 Cutoff |
|---|---|---|---|---|---|
| General | 92.66 | 87.98 | 75.41 | 88.22 | 87.54 |
| EWS | 89.34 | 85.92 | 68.02 | 82.83 | 80.14 |
| OBC | 92.00 | 87.28 | 74.75 | 87.54 | 84.85 |
| SC | 84.00 | 79.03 | 59.25 | 74.08 | 75.41 |
| ST | 82.66 | 74.23 | 47.82 | 69.35 | 70.71 |
(Note: These cutoffs apply only to GS Paper I. As mentioned, CSAT remains fixed at 66.)
How to Use UPSC Marks Calculator for Prelims
To use our UPSC Marks Calculator effectively, follow the steps below:
- Select Paper: You will see toggles at the top of the calculator. Select between GS (Paper I) and CSAT accordingly.
- Enter Correct Attempts: Count the number of correct answers and input it into the "Total Correct Answers" box.
- Enter Incorrect Attempts: Input the total incorrect attempts into the "Total Incorrect Answers" box.
- Ignore The Blanks: If you did not attempt any question, leave them. You do not need to enter them into the calculator as they do not carry a penalty.
- Calculate Your Total Marks: Click on the calculate button to get your result. Once you get it, you can compare it with the previous years' cut-off.
Frequently Asked Questions (FAQs)
How to calculate negative marks in UPSC prelims?
To find your total negative marks, count your wrong answers. Multiply that number by 0.66 for GS Paper 1 and by 0.83 for CSAT. Subtract this penalty amount from the marks you gained from correct answers in each paper, respectively.
How much is negative marking in prelims?
UPSC deducts exactly one-third (1/3rd) of the assigned marks for every wrong answer. This equals a penalty of 0.66 marks per wrong attempt in GS Paper 1 and 0.83 marks in CSAT. Leaving a question completely blank carries zero penalty.
How to calculate UPSC Prelims marks?
First, calculate your positive score by multiplying your correct answers by 2 (for GS) or 2.5 (for CSAT). Next, calculate your negative penalty for the wrong answers. Finally, subtract the negative penalty from your positive score to get your final marks out of 200. You can do it separately for each paper.
How are cut-off marks calculated in UPSC Prelims?
The official cut-off depends entirely on your General Studies (GS Paper 1) score out of 200. Your CSAT marks are never added to the cut-off calculation, provided you score the minimum 66 passing marks. UPSC shifts this cut-off each year based on paper difficulty and the number of open vacancies.
Conclusion
Once you have the estimated marks, compare them against the historical cut-off to see where you stand. If you are calculating actual prelims marks and if your scores fall under the safe zone, immediately shift your focus to Mains preparation.
On the other hand, if you're calculating mock test marks, you can use it to calculate and analyse every mock test you take.