Percentage Calculator

Calculate percentages instantly — percent of, what percent, percentage change, increase & decrease. Runs in your browser.

What is % of ?
is what % of ?
% change from to
Increase by %
Decrease by %

About Percentage Calculator

Five percentage calculators in one tool: find X% of Y, determine what percent X is of Y, calculate percentage change between two numbers, increase a number by a percentage, or decrease a number by a percentage. Results update as you type.

Features

  • What is X% of Y?
  • X is what percent of Y?
  • Percentage change from A to B
  • Increase a number by a percentage
  • Decrease a number by a percentage
  • Real-time results as you type
  • 100% client-side — nothing is uploaded

How to use

  1. 1Find the calculation type you need.
  2. 2Enter the two numbers in the fields.
  3. 3See the result instantly on the right.

Frequently Asked Questions

How do I calculate percent of a number?
Multiply the percentage (as a decimal) by the number. For example, 20% of 150 = 0.20 × 150 = 30.
What is percentage change?
Percentage change = ((new − old) / |old|) × 100. A positive result means increase, negative means decrease.
Does it handle decimals?
Yes. You can enter decimal numbers in any field and results are shown with up to 6 decimal places.
Is my data stored?
No. All calculations run entirely in your browser with no server communication.

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