Calculate percentage change
Calculate the relative increase or decrease from a positive starting value.
Local processing · Nothing is uploaded · 1 MB input limit
Input & settings
Ready. Enter your input to begin.
How to use this tool
The change is (new − original) ÷ original × 100.
Limits and behavior
The original value must be greater than zero. A zero base has no defined percentage change. Input is limited to 1 MB and output to 3 MB. No input content is saved by CraftAI.
Calculate relative percentage increase or decrease
Compare an original positive value with a new value to find the percentage change. This can help explain growth or reduction in measurements, prices and quantities.
Why does the starting value matter?
Percentage change is measured relative to the starting value. This tool requires a positive starting value to provide a well-defined comparison.
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