Percentage is one of the most frequently tested topics in UPSC Quantitative Aptitude — from simple discounts to profit/loss and data interpretation. Use this free calculator to find a percentage of a number, work out what percent one value is of another, or calculate a percentage increase/decrease in one click.
How to Use the Percentage Calculator
This tool has three modes — pick the one that matches your question:
- % of a value — enter a percentage and a number to find, for example, "20% of 450".
- X is what % of Y — enter two numbers to find what percentage the first is of the second.
- Percentage change — enter an original value and a new value to instantly get the percentage increase or decrease.
Percentage Formulas Used
Percentage of a number: (Percentage ÷ 100) × Value. What percent X is of Y: (X ÷ Y) × 100. Percentage change: ((New − Original) ÷ Original) × 100 — a positive result is an increase, a negative result is a decrease.
Why Percentage Matters for UPSC Exams
Percentage forms the base for many other Quant chapters tested in UPSC CSE, CDS, NDA and CAPF — including profit & loss, simple/compound interest, and data interpretation. Getting comfortable with quick percentage calculations directly improves your speed and accuracy across the whole Quant section.
Frequently Asked Questions
How do I calculate a percentage increase or decrease?
Subtract the original value from the new value, divide by the original value, then multiply by 100. Use the "Percentage change" mode above to get this instantly.
Is this percentage calculator free to use?
Yes, it is completely free with no signup required, and works for any number of calculations.
