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Percentage Calculator

Three calculators in one: find what X% of a number is, calculate what percentage one number is of another, or compute the percentage change between two values.

Calculator Tools Runs locally No data sent
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What is X % of Y?

What is % of ?
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X is what % of Y?

is what % of ?
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Percentage change from X to Y

From to
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What is Percentage Calculator?

Percentage Calculator provides three instant calculators: find what X% of a number equals, determine what percentage one number is of another, and compute the percentage change between an old and new value. All three update instantly as you type.

How to Use Percentage Calculator

  1. Choose the calculation type: percentage of a number, percentage ratio, or percentage change.
  2. Enter the numbers in the appropriate fields.
  3. The result updates instantly as you type.
  4. Click Copy next to any result to copy it to your clipboard.

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Understand Percentage Calculations ▾
Example
Input What is 15% of 80?
Output 12
Common Use Cases
  • Calculate a tip or discount amount at a restaurant or shop
  • Find what percentage a sale price is off the original
  • Measure percentage growth between two revenue figures
  • Check what fraction of a total a value represents
Why Use This Tool
  • Three common percentage questions answered in one place.
  • Instant results —no need to press a button to calculate.
  • Copy result in one click for use in documents or spreadsheets.
  • Runs locally with no data sent anywhere.
Frequently Asked Questions
How do I calculate 20% of 150?

Use the first calculator: enter 20 in the percent field and 150 in the number field. The result is 30.

How do I find what percentage 30 is of 150?

Use the second calculator: enter 30 as X and 150 as Y. The result is 20%.

What is percentage change?

Percentage change measures how much a value increased or decreased relative to its original value. A positive result means growth; a negative result means a decrease.

Can it handle decimals?

Yes. All three calculators accept decimal inputs and display up to six decimal places when needed.