Percentage Calculator.

Calculate any percentage: find % of a number, % change between values, or what % one number is of another.

What is X% of Y?
% of = 40
X is what % of Y?
is what % of = 20%
% change from X to Y
= +25%

Three percentage calculators in one: find what X% of a number is, work out what percentage one number is of another, or calculate the percentage change between two values. All three panels work independently and results update as you type.

How to use

Use whichever of the three panels fits your question and enter the numbers. The answer appears instantly on the right. All three panels are independent — you can use them in any combination.

Examples

What is 15% of 200? 30
40 is what % of 160? 25%
% change from 80 to 100 +25%

FAQ

What is percentage change?

Percentage change shows how much a value has increased or decreased relative to its starting point. Positive = increase, negative = decrease.

Can I enter decimal values?

Yes. All inputs accept decimals and results are displayed without trailing zeros for readability.

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Privacy and data handling

This tool runs entirely in your browser. Nothing you type or paste is sent to any server — all processing happens locally on your device.