Percentage Change Calculator
Measure increase or decrease between two values.
Input
This tool runs entirely in your browser. The data you paste or load is never uploaded.
Result
Enter your input, then run the tool.
About this tool
Calculates the percentage change from an old value to a new one, including the direction and the absolute difference. It handles a zero starting value explicitly instead of returning infinity.
How to use it
- Enter the original value and the new value.
- Press Calculate.
- Read the percentage change and the absolute difference.
Frequently asked questions
Is a 50% drop reversible with a 50% rise?
No. Dropping 100 to 50 is -50%, but a 50% rise from 50 only reaches 75.
What if the original value is zero?
Percentage change is undefined. The tool reports the absolute change and explains why.
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