Percentage Calculator

Utilities

Calculate percentages, percentage change, and percentage of a number. Quick and easy.

100% Client-Side. Your data never leaves your device.
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How to use Percentage Calculator

  1. 1Enter your input in the text area above
  2. 2Click the action button to process your data
  3. 3View the result and copy it to your clipboard

Common Use Cases

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Quick Processing

Process your data quickly and efficiently.

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Secure & Private

All processing happens in your browser.

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Free to Use

This tool is completely free with no signup.

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Mobile Friendly

Works on any device with a browser.

Frequently Asked Questions

What types of percentage calculations are supported?

We support: What is X% of Y? (e.g., 20% of 150 = 30), X is what % of Y? (e.g., 30 is 20% of 150), Percentage change from X to Y (e.g., from 100 to 150 is +50%), and Percentage difference between two values.

How do I calculate percentage change?

Formula: % Change = ((New - Old) / Old) × 100. Example: From $80 to $100 = ((100-80)/80)×100 = 25% increase. From $100 to $80 = ((80-100)/100)×100 = -20% (decrease). Positive = increase, negative = decrease.

What's the difference between percentage change and percentage difference?

Percentage change has a direction (from old to new). Percentage difference is the absolute difference relative to the average: |A-B| / ((A+B)/2) × 100. Use change for time series, difference for comparing two independent values.

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