Negative Marking Score Calculator
Choose your exam's marking pattern (check the official notification) and enter your answer counts from the answer key.
Fill in the fields — the answer appears as you type.
Think an answer is wrong? Report it with your inputs.
How it's calculated
- Score = correct × (+marks) − wrong × (penalty)
- Expected value of a random guess with k options = plus ÷ k − penalty × (k − 1) ÷ k
Worked example
90 questions, 58 right, 14 wrong at +4/−1 → 218 / 360.
Load this example into the calculatorAssumptions and limits
- Unattempted questions score 0.
- Pattern presets are common schemes, not official claims for any specific exam — always confirm in the exam notification.
Common questions
Is guessing worth it with +4/−1?
With 4 options a blind guess is worth +0.25 marks on average, so it pays slightly — and much more if you can rule out one or two options.