Percentage Calculator
Calculate percentages in three modes: find a percentage of a number, find what percent one number is of another, or calculate the percentage change between two numbers.
How to use it
Choose the mode that matches your question. Enter values for X and Y. The result updates automatically as you type.
How the calculation works
X% of Y: Multiply Y by X, then divide by 100. X is what % of Y: Divide X by Y, then multiply by 100. % change from X to Y: Subtract X from Y, divide by X, then multiply by 100.
FAQ
Is my data saved? No. Everything runs in your browser. Nothing is sent to a server or stored.
Can I use this for money? Yes. Enter dollar amounts as numbers (e.g., 150 for $150) and the result will show the same unit.
What if Y is zero? The tool shows "–" instead of an error, because dividing by zero is not possible.
Does it work offline? Yes. No internet connection is needed after the page loads.
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