How this calculation works
Measure percentage increase or decrease between an original and new value. The result is calculated locally in your browser from the visible inputs, and the method below remains available for checking.
Percentage change = (new − original) ÷ |original| × 100.
Worked example
A move from 100 to 125 is a 25% increase.
Assumptions and limits
- Inputs use the units shown beside each field.
- Intermediate values retain precision; displayed values are rounded for readability.
Questions people ask
How does the Percentage Increase / Decrease Calculator work?
It applies this displayed method: Percentage change = (new − original) ÷ |original| × 100. Values stay in your browser and are not submitted to a server.
What should I check before using the Percentage change result?
Inputs use the units shown beside each field. Intermediate values retain precision; displayed values are rounded for readability. The result follows the displayed mathematical definition and the precision of the values entered.
Does this Percentage change calculator save my information?
No. Calculation inputs are processed on this device. Sharing creates a URL only when you choose the share action.