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Percentage calculator

Find X% of Y, what percent X is of Y, percentage change, and increase or decrease by a percentage.

Processed in your browser. Files are never uploaded.

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How to use the percentage calculator

  1. Pick the calculation you need.

  2. Enter the two numbers.

  3. Read the result instantly.

  4. Check the formula shown to understand the maths.

  • No upload

    Your files are processed on your device and never sent anywhere.

  • Free, no signup

    No account, no watermark and no daily limit.

  • Fast

    No upload or download wait – results appear in seconds.

What is Percentage calculator?

Percentage calculator answers the four questions people ask most: what is 18% of 2,500; 45 is what percent of 60; what is the percentage change from 80 to 100; and what is 1,200 increased by 15%. Each result shows the formula so you can check it.

When to use it

  • Calculate GST or a discount on a price.
  • Work out your exam percentage.
  • Find the percentage growth in sales or salary.
  • Add a tip or markup to a bill.

Tips for the best result

  • Percentage change is (new − old) ÷ old × 100.
  • A negative change means a decrease.
  • Results update as you type.

Limits and privacy

Percentage change from zero is undefined and is reported as such. Processing happens entirely in your browser, so your data never leaves your device and there is nothing to sign up for. Files are processed in your browser and never uploaded.

Many people who use Percentage calculator also need EMI / loan calculator or Age calculator, and Unit converter is one click away. Every MondayKit tool works the same way – open the page, add your input, get the result – with no account, no watermark and no upload.

Frequently asked questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. 18% of 2,500 = 2,500 × 18 ÷ 100 = 450.

How do I find percentage increase?

Subtract the old value from the new value, divide by the old value and multiply by 100.

What is the difference between percent change and percentage points?

If a rate goes from 10% to 12%, that is a 2 percentage point rise but a 20% relative change.

How do I work out a discount?

Use “Decrease Y by X%”: a 20% discount on 1,500 gives 1,200.

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