How to use Percentage Calculator
Find a percentage of an amount or compare a starting value with a new value using percentage change.
- Choose percentage of a value or percentage change.
- Enter the percentage and value, or the original and new amounts.
- Calculate and check whether the result represents an amount or a percentage.
Worked example
15% of 200 is 30. A change from 200 to 250 is a 25% increase; from 250 to 200 it is a 20% decrease.
Limits and things to check
Percentage change from zero is undefined and rejected. For negative starting values, this tool uses the absolute starting value as the denominator; interpret those results in context.
What is the difference between a percentage and a percentage point?
Moving from 10% to 15% is an increase of 5 percentage points, or a relative increase of 50%. The percentage-change mode calculates the relative change.
Processing and privacy
Your browser performs the operation locally. Inputs and results are not sent to OneClickWorks.
Common questions
Does this tool upload my input?
No. Processing happens in this browser tab and your input is not sent to OneClickWorks.
What happens when I leave the page?
In-memory input and generated download links are released when the page is reset, replaced, or closed. OneClickWorks does not persist tool content.