Percentage Calculator
Calculate what X% of Y is, or what percentage X is of Y.
Percentage calculations appear everywhere — exam scores, salary hikes, GST amounts, discounts, interest rates, population growth, and financial returns. This calculator handles all common percentage problems: finding a percentage of a number, finding what percentage one number is of another, calculating percentage increase or decrease, and working backwards from a percentage result to find the original value.
📋 How to Use This Calculator
Select the type of calculation from the tabs: (1) What is X% of Y? (2) X is what % of Y? (3) Percentage change from X to Y? (4) X after Y% increase/decrease? Enter your values and click Calculate. Each mode shows the formula used so you can verify the logic and replicate it manually when needed.
💡 Key Facts & Information
Essential percentage formulas: P% of N = (P/100) × N. X is what % of Y = (X/Y) × 100. % change = ((New − Old) / Old) × 100. After X% increase: New = Old × (1 + X/100). After X% decrease: New = Old × (1 − X/100). Common Indian applications: GST calculation — price including 18% GST means original = final ÷ 1.18. Salary hike — if salary goes from ₹45,000 to ₹52,000: hike = (7,000/45,000) × 100 = 15.6%. Exam percentage — scored 385/500: percentage = (385/500) × 100 = 77%. TDS — 10% TDS on ₹50,000 = ₹5,000 deducted; you receive ₹45,000.