Percentage Calculator
Free online tool to calculate percentages — fast & accurate
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Calculator 1 — What is X% of a number?
What is
% of
?
Answer
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Calculator 2 — X is what percent of Y?
is what % of
?
Answer
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Calculator 3 — Percentage increase / decrease
Percentage change from
to
?
Answer
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📐 Percentage Formulas
What is X% of Y?
Result = (X ÷ 100) × Y
X is what % of Y?
Result = (X ÷ Y) × 100
% Increase or Decrease
Result = ((New − Old) ÷ |Old|) × 100
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❓ Frequently Asked Questions
What is a percentage?
A percentage is a number expressed as a fraction of 100. It represents a portion of a whole. For example, 25% means 25 out of every 100, or one quarter. The symbol “%” is used to denote percentages.
How do you calculate a percentage?
To find what percentage X is of Y: divide X by Y, then multiply by 100. Example: 20 out of 50 = (20 ÷ 50) × 100 = 40%. To find X% of Y: multiply Y by X and divide by 100. Example: 15% of 200 = (15 × 200) ÷ 100 = 30.
Why do percentages matter in daily life?
Percentages are everywhere — discounts while shopping, interest rates on loans, GST on bills, salary hikes, exam scores, stock market returns, and weather forecasts. Understanding percentages helps you make smarter financial decisions every day.
What is percentage increase vs decrease?
Percentage change = ((New − Old) ÷ Old) × 100. If positive, it’s an increase. If negative, it’s a decrease. Example: price went from ₹500 to ₹600 → ((600−500) ÷ 500) × 100 = 20% increase.
How do I use this calculator?
Just type numbers — results update live as you type. Press Enter to calculate. Press Tab to move between fields. Click Clear to reset. Each of the 3 calculators works independently.
📖 About This Calculator
This free percentage calculator helps you quickly solve the three most common percentage problems. Whether you’re calculating discounts during a sale, working out your exam percentage, figuring out GST, computing a salary hike, or analyzing investment returns — our tool gives instant, accurate answers without any sign-up required.
All calculations happen in your browser — no data is sent to any server. The calculator works on mobile, tablet, and desktop with equal ease.
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