➗ Percentage Change Calculator — Increase or Decrease
Enter the original and new values to see how much a number has grown or shrunk as a percentage.
Input
Result
Details
Private by design. This tool runs entirely in your browser — nothing you enter or add is uploaded to any server.
How it works
- Enter the starting (original) value and the ending (new) value.
- Click Calculate or change the numbers.
- See the percentage change, absolute difference, and whether it increased or decreased.
Examples
- From 80 to 100 is a 25% increase.
- From 200 to 150 is a 25% decrease.
- Useful for tracking price changes, growth, or score improvements.
Frequently asked questions
What is the formula for percentage change?
((New − Old) / |Old|) × 100. A positive result means increase; negative means decrease.
What if the original value is zero?
Percentage change from zero is undefined. The tool will show a message instead of a number.
Is my data sent anywhere?
No. All calculations happen locally in your browser.
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