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Percentage Calculator

Calculate percentages: X% of Y, X is what % of Y, and % change.

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How to use Percentage Calculator

  1. 1

    Select a mode

    Choose between 'X% of Y', 'X is what % of Y', or '% Change' using the tabs above.

  2. 2

    Enter values

    Type in the two numbers you want to calculate with.

  3. 3

    See result instantly

    The result updates in real-time as you type — no button needed.

  4. 4

    Copy result

    Click the Copy button to copy the full calculation to your clipboard.

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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.