How to use the negative marks calculator
- Enter the total questions, your correct and wrong answers. Unattempted questions are worked out for you.
- Enter the marks per correct answer.
- Choose the negative marking scheme — none, ¼, ⅓, ½, 1 mark, ¼ of the full mark, or a custom penalty.
- Read your final score, percentage, accuracy and the guessing tip.
Formula
Your real score, not your raw score
In exams with negative marking, every wrong answer costs you. Counting only correct answers overestimates your score, sometimes by a lot. This calculator applies the deduction rule your exam uses and shows the score you’ll actually receive.
The formula
Final score = (C × m) − (W × p)
- C: correct answers
- W: wrong answers
- m: marks per correct answer
- p: penalty per wrong answer
Worked example
A 100-question test, 4 marks per correct answer, 1 mark deducted per wrong answer (¼ of the full mark). You answer 62 correctly and 18 wrong, and skip 20.
| Marks | |
|---|---|
| Marks gained (62 × 4) | +248 |
| Marks lost (18 × 1) | −18 |
| Final score | 230 / 400 (57.5%) |
| Accuracy | 62 ÷ 80 = 77.5% |
Without negative marking you’d have expected 248, so the wrong answers cost you 18 marks.
Common marking schemes
| Scheme | Correct | Wrong |
|---|---|---|
| 1 mark, ¼ negative | +1 | −0.25 |
| 1 mark, ⅓ negative | +1 | −0.33 |
| 4 marks, −1 (JEE/NEET style) | +4 | −1 |
| 3 marks, −1 | +3 | −1 |
| No negative marking | +m | 0 |
Rules change over time and between papers, so confirm the scheme in your exam’s official notice.
When does guessing pay?
For a question with k options, a blind guess has an expected value of:
EV = m/k − p × (k − 1)/k
With 4 options and +1 for correct:
- a −¼ penalty gives EV = 0.25 − 0.1875 = +0.0625, so blind guessing helps very slightly;
- a −⅓ penalty gives EV = 0 exactly, so it’s neutral;
- a −½ penalty gives EV = −0.125, so skip blind guesses.
Eliminate just one option and the odds improve to 1 in 3, which turns even the ⅓ scheme positive. The calculator shows the guessing value for your scheme under the result.
Plan your revision week with the time table maker, and convert scores to percentages with the percentage calculator.
Frequently asked questions
How is negative marking calculated?
Multiply your correct answers by the marks for each correct answer, multiply your wrong answers by the penalty per wrong answer, and subtract the second from the first. Unattempted questions score zero.
What does "¼ negative marking" mean?
It usually means a quarter of a mark is deducted for each wrong answer when each correct answer is worth 1 mark. In exams where a correct answer is worth 4 marks, the penalty is often 1 mark — which is a quarter of the full mark. Use the "¼ of full mark" option for that.
Should I guess when there is negative marking?
It depends on the penalty. On a 4-option question worth 1 mark, a blind guess averages +0.0625 marks with a ¼ penalty and exactly zero with a ⅓ penalty. Eliminating even one option makes guessing clearly worthwhile in both cases. With harsher penalties, skip blind guesses.
Do unattempted questions get negative marks?
In almost all exams, no — only wrong answers are penalised. Check your exam's official rules.
Can my score be negative?
Yes. If deductions exceed the marks gained, the final score is negative, and the calculator shows it.