Percentage Calculator

Choose the question you want answered, enter two numbers and get the result with the formula used.

How to use it

1. Pick a mode, such as "X% of Y" or "Percentage change".
2. Enter the two numbers. Commas are allowed (for example 2,400).
3. Press Calculate to see the answer and the working.

Limitations

• Results are rounded to at most 6 decimal places.
• Percentage change from 0 is undefined, so the tool shows an error instead of a number.
• This is a general-purpose calculator, not financial or tax advice.

Frequently asked questions

How do I find 15% of a number?

Multiply the number by 0.15. For 2,400 that is 360.

How is percentage change calculated?

(new − old) ÷ |old| × 100. A positive result is an increase and a negative result a decrease.

Is anything stored?

No. Numbers stay in your browser.

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