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Percentage Increase / Decrease Calculator

Calculate the percentage change between initial and final values.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Formula: ((Final - Initial) / |Initial|) * 100. Useful for tracking price increases, traffic growth, and sales variance.

How to use it (step by step)

  1. 1Fill in the boxes: “Starting / Initial Value”, “Final / New Value”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Percentage
A part out of 100. 25% of 200 = 50.
Tracking parameters
Extra codes apps add to shared links to know who shared it. Removing them keeps the link working and more private.
Standard deviation
How spread out numbers are. Small = numbers are close together; big = they vary a lot.

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