About this tool

Negative Marking Calculator UPSC

Apply the UPSC prelims one-third penalty to your attempt plan and find the attempt count that maximises expected marks.

This UPSC negative marking calculator applies the Civil Services Preliminary Examination penalty — one-third of the marks assigned to a question, deducted for every wrong answer — to a tiered attempt plan and returns the expected score plus the attempt count that maximises it. Because the deduction is one-third, the break-even accuracy is exactly 25%, which is the same as the odds of a blind guess among four options, so a wild guess is mathematically neutral and only elimination makes attempting profitable. It covers both Paper I General Studies at 2 marks a question and the qualifying CSAT paper at 2.5 marks a question.

How to use Negative Marking Calculator UPSC

1. 1

   Open Negative Marking Calculator UPSC on AltFTool — it loads instantly in your browser.

2. 2

   Enter the values you already know.

3. 3

   Fine-tune the options to match your scenario.

4. 4

   Read the result and use it in your planning or reporting.

Why use Negative Marking Calculator UPSC

• Tiered, not a single accuracy figure

  Sure answers, two-option guesses, three-option guesses and blind guesses are scored separately.

• Names the optimal attempt count

  Tiers with a negative expected value are identified so you know exactly which attempts to drop.

• Handles both papers correctly

  GS Paper I uses 2 marks a question and CSAT uses 2.5, so the deduction differs and is calculated for each.

Common use cases

• Deciding how many of the 30 borderline questions in a mock to attempt when two options can be ruled out and how many to leave blank.
• Checking whether an 85-attempt strategy at 70% accuracy beats a 65-attempt strategy at 85% accuracy on the same GS paper.
• Confirming a CSAT attempt plan still clears the 33% qualifying bar of 66 marks after the penalty is applied.

Frequently asked questions