Percentage Change Calculator
Increase or decrease between two values, as a percent.
How to use the Percentage Change Calculator
- Enter your figures in the fields above — results update instantly as you type.
- Choose your currency symbol (the maths is the same in any currency).
- Use Share result to save a link that reloads your exact inputs, or Print for your records.
- Compare scenarios by changing one input at a time and noting how the main result moves.
Formula
Change % = (New − Old) ÷ |Old| × 100Worked example
From 80 to 100 is +25%; from 100 back to 80 is −20%.
Frequently asked questions
Why is the reverse different?
Each change is measured against a different starting value.
What if old is zero?
Percentage change from zero is undefined.
Learn more
Assumptions & limits
Results are estimates based on the inputs you provide and the formula shown, rounded for display. They do not account for every fee, tax rule or market condition. This tool is educational and is not financial, tax or legal advice — confirm important decisions with a qualified professional.
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