Free Percentage Calculator
3 calculators in one — fast, accurate, works on any device
% What is X% of Y?
% X is what % of Y?
% Change Calculator
✓ Live Results
Results update live as you type
Find the value of a percentage of a number. Useful for discounts, tips, commissions.
What is
?
%
of
✓ Answer
—
—
Find what percentage one number is of another. Useful for exam scores, conversion rates, test results.
✓ Answer
—
—
Find the percentage increase or decrease between two values. Useful for price changes, salary hikes, stock returns.
From
to
?
✓ Answer
—
—
Percentage Formulas
The math behind each calculator.
① What is X% of Y?
Result = (X ÷ 100) × Y
e.g. 20% of 150
= (20÷100)×150 = 30
e.g. 20% of 150
= (20÷100)×150 = 30
② X is what % of Y?
Result = (X ÷ Y) × 100
e.g. 45 of 60
= (45÷60)×100 = 75%
e.g. 45 of 60
= (45÷60)×100 = 75%
③ % Change
Result = ((New−Old) ÷ |Old|) × 100
e.g. 500 → 600
= (100÷500)×100 = +20%
e.g. 500 → 600
= (100÷500)×100 = +20%
Common Examples
Click any card to auto-fill the calculator.
🛍️ Discount
20% of $500
= $100 off → $400
🧾 GST / Tax
18% of $1,000
= $180 tax → $1,180
📝 Exam Score
45 out of 60
= 75%
💼 Salary Hike
$30K → $36K
= +20% raise
📱 Conv. Rate
3 of 40 clicks
= 7.5%
📉 Price Drop
$100 → $85
= −15%
About This Calculator
This free percentage calculator covers the three most common percentage problems. Whether you're calculating discounts, exam scores, salary hikes, GST, investment returns, or any numeric comparison — get instant, accurate answers with no sign-up required.
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 "%" denotes percentages.
Real-World Uses
- Shopping: Calculate discount amounts and sale prices
- Finance: Interest rates, loan EMIs, investment returns
- Tax: GST, VAT, income tax computations
- Work: Salary hikes, commission rates, performance metrics
- Education: Grade percentages, test scores, pass rates
Frequently Asked Questions
To find X% of Y: multiply Y by X and divide by 100. Example: 15% of 200 = (15 × 200) ÷ 100 = 30. To find what % X is of Y: divide X by Y then multiply by 100. Example: 20 out of 50 = (20 ÷ 50) × 100 = 40%.
Percentage change = ((New − Old) ÷ Old) × 100. A positive result means increase; negative means decrease. Example: price went from $500 to $600 → ((600−500)÷500)×100 = 20% increase.
Percentages are everywhere — discounts while shopping, interest rates on loans, tax on bills, salary hikes, exam scores, stock returns, and weather forecasts. Understanding percentages helps you make smarter financial decisions every day.
Use Calculator ①: enter the discount percentage and the original price. Example: 30% off $250 → 30% of 250 = $75 saved → final price = $175. Or use Calculator ② to find what percentage the discount amount is of the original price.
Just type numbers — results update live as you type. Press Enter to calculate. Click the tab for the type of calculation you need. Click any Quick Example card to auto-fill. Press Clear to reset any calculator.
