Percentage Calculator — Free Online Tool
Solve any percentage problem in three modes: find what percentage X is of Y, calculate X% of a given number, or compute the percentage change between two values. Each result shows the formula used so you can understand and verify the calculation.
100% client-side. No uploads. Your data never leaves your browser.
How to use Percentage Calculator
- Select the calculation mode: 'X% of Y', 'What % is X of Y', or 'Percentage change'.
- Enter the required numbers in the input fields.
- The result appears instantly with the formula shown below.
- Copy the result with the Copy button.
Frequently Asked Questions
How do I calculate a percentage increase?
Use the '% change' mode. Enter the original value and the new value. The result shows the percentage increase or decrease with its sign (positive = increase, negative = decrease).
Can I find what percentage one number is of another?
Yes. Use the 'X is what % of Y' mode. For example, 25 is what % of 200? Answer: 12.5%.
What if I want X% of a number?
Use the 'What is X% of Y' mode. For example, what is 15% of 80? Answer: 12.
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