Percentage Calculator
Calculate percentages instantly in your browser — four common calculation types in one tool.
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How to use this tool
A percentage calculator handles the everyday percentage math that's easy to get wrong by hand: finding a portion of a number, figuring out what percentage one number is of another, applying a discount or markup, or measuring how much something has grown or shrunk. It's useful for tasks like calculating a discount at checkout, figuring out a tip, tracking a sales increase, or checking exam scores.
For example, using “X% of Y” with 20% of 150 gives 30. Using “% change from X to Y” from 150 to 180 gives a 20% increase.
Choose a calculation mode, enter the two numbers it needs, and the result updates automatically as you type.
FAQ
Is this percentage calculator free to use?
Yes, this tool is completely free to use with no limits on how often you can use it.
Does my data get uploaded anywhere?
No. Every calculation happens directly in your browser. Nothing is sent to a server.
What do the four calculation modes do?
"X% of Y" finds a portion of a number. "X is what % of Y" finds what percentage one number represents of another. "Increase/decrease Y by X%" applies a percentage change to a value. "% change from X to Y" finds the percentage difference between two values.
What's the difference between "increase/decrease Y by X%" and "% change from X to Y"?
"Increase/decrease Y by X%" starts with a value and a percentage and calculates the new result — e.g., $150 increased by 20% is $180. "% change from X to Y" runs the other direction: it starts with two values and tells you what percentage change occurred between them — e.g., going from $150 to $180 is a 20% increase.
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