Percentage Calculator
Calculate percentages easily in different modes.
What is X% of Y?
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How to use Percentage Calculator
1
Choose a calculation mode using the tabs: X% of Y, X is ?% of Y, or % Change.
2
Enter the required values in the input fields.
3
Click "Calculate" to see the result instantly.
4
Use "Reset" to clear the fields and start a new calculation.
How it works
The calculator uses three standard percentage formulas:
- What is X% of Y? — Formula:
Result = (X / 100) × Y. Example: 25% of 200 = 50. - X is what % of Y? — Formula:
Percentage = (X / Y) × 100. Example: 50 is 25% of 200. - Percentage Change — Formula:
Change = ((New − Original) / |Original|) × 100. A positive result indicates an increase; a negative result indicates a decrease.
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Frequently Asked Questions
How do I calculate a percentage of a number?
Use the first tab "X% of Y". Enter the percentage as X and the number as Y. For example, to find 15% of 500, enter 15 and 500. The result is 75.
How do I find what percentage one number is of another?
Use the second tab "X is ?% of Y". Enter the part as X and the whole as Y. For example, 40 is what percent of 200? Enter 40 and 200, and the answer is 20%.
How is percentage change calculated?
Percentage change is calculated as ((New Value − Original Value) / |Original Value|) × 100. If the result is positive, it is an increase. If negative, it is a decrease.
Can I use negative numbers or decimals?
Yes. The calculator handles negative numbers, decimals, and zero values. Division by zero is caught and displayed as an error message.