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Percentage Calculator

Six everyday percentage calculations, each with its own boxes and the formula behind the answer.

Runs in your browser · No uploads

Percent of a number

What is % of ?

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What percent one number is of another

is what % of ?

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Percentage increase or decrease

Change from to

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Add or take off a percentage

increased by %

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Find the whole from a part

is % of what?

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Percentage difference between two values

Difference between and

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  • Nothing leaves your device
  • No server-imposed size limits
  • No sign-up, no watermark
  • Free

How to use the percentage calculator

  1. Find the calculation that matches your question.
  2. Type your two numbers; the answer updates as you type.
  3. Check the formula under the answer.

Which calculation do I need?

QuestionCalculation
What is 15% of 80?Percent of a number
30 is what percent of 120?What percent one number is of another
The price went from 80 to 100: by how much?Percentage increase or decrease (+25%)
Add 20% VAT to 50Add or take off a percentage (use −20 to take 20% off)
12 is 15% of what?Find the whole from a part
How different are 120 and 150?Percentage difference

Percentage change or percentage difference?

Percentage change compares a new value with an old one, so the order matters: from 80 to 100 is +25%, but from 100 to 80 is −20%. Percentage difference compares two values with no "before" and "after", relative to their average, so the order doesn't matter.

Frequently asked questions

Why is taking 20% off and adding 20% back not the same price?

Because the second percentage is taken of a different number. 100 minus 20% is 80; 80 plus 20% is 96.

Is anything sent anywhere?

No. The calculation happens in your browser as you type; nothing is sent anywhere.

Guides for this tool