About Percentage Calculator
Percentage calculations come up constantly — discount prices, tax calculations, grade percentages, interest rates, tip amounts, data analysis ratios, and business metrics. Our free Percentage Calculator handles four core calculations: What is X% of Y? What percentage is X of Y? X increased/decreased by Y% is? and What percentage change is from X to Y? — all in one clean, fast interface.
Understanding percentages is fundamental financial literacy. Shopping discounts (30% off a $120 item = $36 off), tax calculations (VAT at 20% on £50 = £10), interest rate comparisons, salary increases (a 7% raise on $65,000 = $4,550), tip calculations (18% tip on $47.50 = $8.55), and grade calculations (38 correct out of 45 = 84.4%) all require quick, accurate percentage math.
For data analysts, marketers, and business professionals, percentage change calculations are daily tools — year-over-year growth rates, conversion rate improvements, experiment uplift calculations, and budget variance analysis all require knowing the precise percentage difference between two values. Our tool shows both the absolute difference and the percentage change.
How to Use the Percentage Calculator
Choose calculation type
Select from: 'X% of Y', 'X is what % of Y', 'percentage change from X to Y', or 'X increased/decreased by Y%'.
Enter your values
Type the numbers into the input fields.
Read the answer
The result appears instantly with a plain-English explanation (e.g., '15% of 200 is 30').
Key Features & Highlights
Common Use Cases
- Calculate discount price from a percentage off
- Find what percentage score you got on a test
- Calculate tip amount for restaurant bills
- Determine year-over-year growth percentage
- Calculate tax amounts from percentage rates
- Find percentage increase or decrease between two values
Frequently Asked Questions
Percentage change = ((New Value - Old Value) / Old Value) × 100. A positive result is an increase; a negative result is a decrease.
Percentage describes a proportion of a whole. Percentage points describe the arithmetic difference between two percentages. If interest rates go from 3% to 5%, that's a 2 percentage point increase — but a 66.7% increase in the rate itself.
Multiply the original price by 0.20 to get the discount amount, then subtract from the original price. Or multiply the original price by 0.80 to get the final price directly. Our 'X increased/decreased by Y%' mode handles this automatically.
Yes, 100% free with no hidden fees, subscriptions, or account requirements.
Everything runs client-side directly inside your web browser. No files, texts, or parameters are sent to our servers.
Yes, our tools are fully responsive and work seamlessly on iPhones, iPads, Android smartphones, and tablets.