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Percentage Calculator

Calculate percentages quickly — find X% of Y, percentage change between values, and what percent A is of B.

Find a percentage of a number

Result
Enter numbers to calculate
Example: 15% of 200 → 30

How to Use This Tool

  1. 1

    Choose a calculation mode

    Select from three modes: find a percentage of a number, calculate percentage change between two values, or determine what percent one number is of another.

  2. 2

    Enter your numbers

    Type the values into the input fields. The labels change depending on the selected mode to guide you.

  3. 3

    View the result instantly

    The percentage result updates in real time as you type. No need to press a calculate button.

  4. 4

    Copy to clipboard

    Click the result to copy it to your clipboard for use in spreadsheets, documents, or other applications.

Frequently Asked Questions

How do I calculate a percentage of a number?
Select the 'Percent Of' mode, enter the base number and the percentage value. For example, to find 20% of 150, enter 150 and 20. The calculator instantly shows 30.
What is percentage change and how is it calculated?
Percentage change measures the relative difference between an old value and a new value. The formula is ((New − Old) / |Old|) × 100. A positive result means an increase, and a negative result means a decrease.
Can I use decimal numbers?
Yes, you can enter decimal numbers in both input fields. The calculator handles decimals with up to 4 digits of precision in the result.
Is this percentage calculator free to use?
Absolutely. This online percentage calculator is 100% free, requires no sign-up, and works entirely in your browser with no data sent to any server.