Percentage Calculator

Free online percentage calculator. Calculate what is X% of Y, percentage increase, percentage decrease, and percentage change between two numbers.

How the Percentage Calculator works

A percentage expresses a value as a fraction of 100. The calculator divides the part by the whole and multiplies by 100 to find the percentage. For changes it divides the difference by the original value, then multiplies by 100.

Formula

Percentage = (Part / Whole) × 100

How to use the Percentage Calculator

  1. 1The percentage calculator is designed to be simple and fast.
  2. 2Choose the calculation type.
  3. 3Enter the values.
  4. 4Your result is shown immediately.

Examples

  • What is 15% of 200? = 30
  • Percentage change from 80 to 100? = 25% increase

Benefits

  • Completely free with no signup required.
  • Runs entirely in your browser for instant results and privacy.
  • Works on mobile, tablet and desktop.
  • Results can be copied with one click.

Frequently Asked Questions

Is the percentage calculator free to use?

Yes. The percentage calculator is 100% free, with no signup, no watermark and no hidden limits.

Does the percentage calculator store my data?

No. All calculations and processing happen locally in your browser. Nothing is uploaded to a server.

Does the percentage calculator work on mobile?

Yes. The percentage calculator is fully responsive and works on phones, tablets and desktop computers.

How do I calculate percentage increase?

Use the formula: ((New - Old) / Old) × 100. For example, going from 80 to 100 is a 25% increase.

How do I calculate percentage decrease?

Use the same formula: ((Old - New) / Old) × 100. A drop from 100 to 80 is a 20% decrease.

Related tools