Percentage Change Calculator

Free online percentage change calculator. Calculate percent increase, percent decrease, percentage difference, and reverse values. Instant results, pure client-side.

Quick Examples

How to Use

  1. Select a calculation mode from the dropdown.
  2. Enter the required values in the input fields.
  3. Click "Calculate" to see instant results with all breakdowns.
  4. Use the "Clear" button to reset and try another calculation.

About Percentage Change Calculator

A clean, fast percentage change calculator for everyday math and business analysis. Supports five calculation modes: percentage change between two values, percentage increase, percentage decrease, reverse calculation to find the original value, and percentage difference. All calculations happen instantly in your browser — no server, no delay, no data sent anywhere.

Features

FAQ

Is this calculator free to use?

Yes, completely free. No registration, no ads, no limits.

How do I calculate percentage change?

Select "Percentage Change" mode, enter the old value and the new value. The result shows the percentage increase or decrease, plus the absolute difference.

Can I find the original value if I know the new value and the percentage change?

Yes! Select "Reverse Calculate" mode, enter the new value and the percentage change. The calculator will compute the original value for you.

Does it handle negative numbers?

Yes, all modes support negative numbers and decimals.

Is my data private?

Absolutely. All calculations happen inside your browser. Nothing is sent to any server.