Percentage Calculator
Calculate percentages: X% of Y, X is what % of Y, and % change.
Percentage Calculator is a versatile tool that solves all common percentage problems with instant results and visual explanations. Calculate what percent one number is of another, find a percentage of any value, or determine percentage change between two numbers. Essential for students, business professionals, shoppers comparing discounts, and anyone working with financial data or statistics.
How to use Percentage Calculator
- 1
Select a mode
Choose between 'X% of Y', 'X is what % of Y', or '% Change' using the tabs above.
- 2
Enter values
Type in the two numbers you want to calculate with.
- 3
See result instantly
The result updates in real-time as you type — no button needed.
- 4
Copy result
Click the Copy button to copy the full calculation to your clipboard.
Related Tools
Age Calculator
Calculate your exact age in years, months, and days from your birthdate.
BMI Calculator
Calculate your Body Mass Index using metric or imperial units.
Loan Calculator
Calculate monthly payments, total interest, and full amortization schedule.
Tip Calculator
Calculate tip amount and split the bill between multiple people.
Frequently Asked Questions
How do I calculate X% of a number?
Select the 'X% of Y' tab, enter the percentage in the first field and the number in the second. The tool instantly computes the result. For example, 25% of 200 = 50.
How do I find what percentage one number is of another?
Select 'X is what % of Y', enter the part in the first field and the whole in the second. For example, 50 is 25% of 200.
How is percentage change calculated?
Percentage change is calculated as ((New - Old) / |Old|) × 100. It shows whether the change is an increase or decrease.
Can I use decimal numbers?
Yes, the calculator supports any decimal or integer values in both fields.
Is this tool free to use?
Yes, completely free with no sign-up required. All calculations happen instantly in your browser.