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1/3 Negative Marking & Penalty Calculator

Calculate final score, accuracy percentage, and penalty loss for exams with 1/3 or 1/4 negative marking.

Marks gained
+70.00
Marks deducted
−6.67
Net score
63.33
Out of 100 · 63.3%
Accuracy
77.8%

Is guessing worth it?

With a 1/3 penalty, a guess breaks even when you are right about 25% of the time.

On a four-option question a blind guess is right 25% of the time, so guessing is worth it on average — though eliminating even one option changes that.

1/3 Negative Marking & Penalty Calculator: how it works

Different examinations use different negative marking fractions, and the fraction determines exactly how confident you need to be before attempting a question.

Common penalty fractions

FractionUsed byBreak-even accuracy
1/3UPSC, SSC, most state PSCs25%
1/4JEE, NEET, CAT20%
1/2Some banking and state exams33.3%
1/5A few state examinations16.7%

Net score = (Correct × Marks) − (Wrong × Marks × Fraction)

The break-even calculation

Attempting a question is worth it when the expected gain exceeds the expected loss. If p is your probability of being right and f is the penalty fraction, the attempt is worth making when p exceeds 1 ÷ (1 + 1/f).

Worked example · One-third penalty

Given

  • Penalty fraction: 1/3
  • Four options

Working

  1. 1Break-even p = 1 ÷ (1 + 3) = 0.25
  2. 2Blind guess on four options = 0.25

Exactly break-even — guessing neither gains nor loses on average

Worked example · One-quarter penalty

Given

  • Penalty fraction: 1/4
  • Four options

Working

  1. 1Break-even p = 1 ÷ (1 + 4) = 0.20
  2. 2Blind guess = 0.25, which exceeds 0.20

Guessing is positive on average — JEE and NEET reward attempting

What this means in practice

  • With 1/4 marking, attempt everything. The arithmetic favours it even on a blind guess.
  • With 1/3 marking, attempt anything where you can eliminate one option.
  • With 1/2 marking, be genuinely selective — you need to be right a third of the time just to break even.

Frequently asked questions

One third of the marks allotted to a question is deducted for a wrong answer. On a 1-mark question that is 0.333 deducted; on a 2-mark question, 0.667.

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