How to use this tool
- Select the percentage operation you need.
- Enter both values and calculate. For change, enter the new value and the original reference value.
When it comes in handy
Percentages make it easier to compare proportions, discounts and changes on a common scale.
Frequently asked questions
Is this tool free?
Yes. You can use it without creating an account or paying a subscription.
Is my data uploaded?
The processing happens locally in your browser. Your tool inputs and files are not sent to our server.
What should I know about the result?
Division by zero is undefined. Percentage change uses the absolute original value as denominator; interpret negative reference values with care.