How to calculate marks with negative marking
- Enter the number of correct and wrong answers. Enter zero if there are none.
- Set the marks awarded for each correct answer.
- Choose the deduction for a wrong answer. Fractional choices use the correct-answer marks; a custom fixed deduction uses the number of marks you enter.
- Select Calculate score to see the estimated raw score and its working.
Negative-marking formula
Raw score = (correct answers × marks per correct answer) − (wrong answers × deduction per wrong answer).
Unattempted answers add zero in this calculator. It supports one marking scheme at a time. If your sections use different marks or penalties, calculate each section separately and add the raw scores.
One-third negative marking example
For 60 correct answers and 15 wrong answers, with one mark per correct answer and a one-third penalty, the score is 60 − (15 × 1/3) = 55 marks.
The one-third option uses the fraction throughout the calculation. A custom deduction of 0.33 is different: three wrong answers deduct 0.99 marks, while three one-third deductions total exactly one mark.
Fixed deduction example
If correct answers earn two marks and wrong answers lose a fixed 0.5 mark, 40 correct and eight wrong answers give (40 × 2) − (8 × 0.5) = 76 marks. Choose Custom fixed marks and enter 0.5.
Can the score be negative?
Yes. The calculator shows a negative result when deductions exceed the marks gained. It does not automatically change that result to zero. Follow your examination authority’s rules if it applies a score floor.
What this score includes
This is arithmetic from your inputs. It does not apply normalisation, bonus marks, dropped-question policies, sectional cutoffs or a selection rule. Check the official answer key and marking scheme before entering your counts.
Displayed values are rounded to two decimal places after calculation, so rounded components may differ slightly from the final working. The displayed score is not a rank, percentile or prediction of selection.
Need a percentage from a non-negative total score? Use the marks-percentage calculator. You can also browse answer-key notices or all exam tools.