Negative Marking Calculator
(1/3, 1/4, 1/2 or Custom Penalty)
Enter your correct and wrong answers, the marks per question and the penalty rule to get your final score, marks lost, accuracy and the break-even accuracy for guessing.
Negative marking rule
Do not count unattempted questions
Most objective exams use 4 options
Result
💡 Formula Guide
How Negative Marking Works
Negative marking deducts marks for wrong answers so that random guessing does not pay. If every answer earned marks whether right or wrong, a candidate could fill in the whole answer sheet and expect a fair score by luck alone. A penalty removes that advantage: the more wrong answers, the more marks lost. Most Indian competitive exams use a fraction of the question's marks as the deduction, most often one-quarter or one-third, and unattempted questions are neither rewarded nor penalised.
Example. A paper has 100 questions worth 2 marks each with 1/3 negative marking. You answer 62 correctly and 24 incorrectly and leave 14 blank. Correct answers earn 62 × 2 = 124. Each wrong answer costs 2 ÷ 3 = 0.667 marks, so 24 wrong answers cost 16. Your score is 108 out of 200. Your accuracy on attempted questions is 62 ÷ 86 = 72.1%, well above the 25% break-even for this rule.
Should You Guess? The Break-Even Rule
Whether to attempt a doubtful question comes down to probability. If p is your chance of being right, the expected gain from answering is p × marks − (1 − p) × penalty. That is positive only when p is greater than penalty ÷ (marks + penalty). Written with the penalty as a fraction f of the marks, the break-even becomes f ÷ (1 + f).
| Rule | Penalty (per 1 mark) | Break-even chance of being right | Blind guess with 4 options |
|---|---|---|---|
| No negative marking | 0 | 0% | Always positive: attempt everything |
| 1/4 | 0.25 | 20% | Slightly positive (+0.0625 per mark of the question) |
| 1/3 | 0.333 | 25% | Exactly zero on average |
| 1/2 | 0.5 | 33.3% | Negative (−0.125 per mark of the question) |
The practical lesson is elimination. Under a 1/3 rule, if you can rule out one of four options and guess among the remaining three, your chance is 33% and the expected value per attempt is about +0.11 marks per mark. Rule out two options and it rises to +0.33. A completely blind guess earns nothing on average under 1/3, so the decision should rest on how many options you can eliminate rather than on hope. The calculator's "blind-guess value" shows the four-option case for your chosen rule.
💡 Tip: track your accuracy on attempted questions in mock tests. If it sits comfortably above the break-even figure, moderate risk-taking helps; if it hovers near it, skipping the questions you are unsure about protects your score.
Common Exam Penalties
| Exam | Marks per correct answer | Penalty for a wrong answer |
|---|---|---|
| UPSC Civil Services Prelims, GS Paper I | 2 | One-third of the marks |
| UPSC Prelims, CSAT (qualifying) | 2.5 | One-third of the marks |
| SSC CPO Paper 1 | 1 | 0.25 |
| NEET | 4 | 1 (one-fourth) |
| JEE Main, multiple choice | 4 | 1 (one-fourth) |
| AP exams and the digital SAT | 1 per question | None |
Patterns are revised from time to time, so treat this table as a reference and confirm the rule in the latest official notification. If your exam has sections with different marks or penalties, calculate each section on its own and add them,, as our UPSC Prelims Marks Calculator does for GS and CSAT.
Rounding, and Why Totals Sometimes Differ by a Fraction
One-third of a mark is a repeating decimal, so results depend on how it is rounded. Working with the exact fraction, 24 wrong answers on a 2-mark question cost exactly 16 marks. If a website rounds the deduction to 0.66 or 0.67 per answer, the same 24 answers cost 15.84 or 16.08. Neither is wrong; they are different roundings of the same rule. The official result uses the examining body's own method, so use any calculator as a close estimate and keep a small margin when comparing with a cut-off.
For exams with no penalty, you can still use this tool with a custom penalty of zero to see your score, accuracy and unattempted count. If you are working on other scores, try the Grade Calculator for weighted class grades or the AP US Government Score Calculator, where wrong answers are never penalised.
How to Use the Calculator
- Choose the penalty rule that matches your paper, or enter a custom marks-per-wrong-answer value.
- Enter total questions and the marks for each correct answer.
- Enter how many answers were correct and how many were wrong. Leave unattempted questions out.
- Read your final score and marks lost, then compare your accuracy with the break-even figure to judge whether guessing helped or hurt.
Frequently Asked Questions About Negative Marking
How do you calculate negative marking?
Multiply correct answers by the marks per question, then subtract wrong answers multiplied by the penalty. With 62 correct and 24 wrong on a paper worth 2 marks per question with 1/3 negative marking, the score is 62 × 2 − 24 × (2 ÷ 3) = 124 − 16 = 108. Unattempted questions score zero and are not penalised.
What does 1/3 negative marking mean?
For every wrong answer, one-third of the marks allotted to that question are deducted. On a 2-mark question that is about 0.67 marks, on a 1-mark question about 0.33 and on a 2.5-mark question about 0.83. Some sources round these figures to two decimals, which can change a long total by a few tenths of a mark.
What does 1/4 negative marking mean?
One-fourth of a question's marks are deducted for each wrong answer. On a 1-mark question that is 0.25 marks. On a 4-mark question, as in NEET and the multiple choice section of JEE Main, it is 1 mark.
Should I guess when there is negative marking?
It depends on your confidence. Guessing is worth it when your chance of being right is above penalty ÷ (marks + penalty). For a 1/3 penalty that break-even is 25%, for 1/4 it is 20% and for 1/2 it is about 33%. A pure guess among four options gives exactly 25%, so under 1/3 marking a blind guess has zero expected value, while under 1/4 it is slightly positive.
What is the break-even accuracy shown by the calculator?
It is the minimum probability of being correct at which attempting a question does not lower your expected score. Above it, attempting helps on average; below it, leaving the question blank is safer. The calculator also compares it with your actual accuracy on attempted questions.
Are unattempted questions penalised?
No. Unattempted questions earn zero marks and lose nothing, which is exactly what makes skipping a question different from getting it wrong.
Which exams use negative marking?
It varies by exam and year. UPSC Civil Services Prelims deducts one-third of a question's marks, SSC CPO Paper 1 deducts 0.25 per wrong answer, and NEET and JEE Main multiple choice questions use 1/4. Many other tests, including AP exams and the digital SAT, have no penalty. Always confirm the current rule in your exam's official notification.
Can I use it for any exam?
Yes. Use the custom option and enter the exact marks deducted, or pick a fraction and set the marks per correct answer. If your exam gives different marks to different sections, calculate each section separately and add the results.
Last Updated: September 2026 | Penalty rules for named exams reflect published patterns and change by year; confirm against the official notification for your exam.