Percentage Calculator
Calculate percentages instantly: find X% of Y, determine what percent X is of Y, and compute percentage change between two values.
What is X% of Y?
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Result
X is what % of Y?
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Result
Percentage change from X to Y
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Result
Frequently Asked Questions
How do I calculate what percentage one number is of another?▾
Divide the part by the whole and multiply by 100. For example, 30 is 15% of 200 because (30 / 200) x 100 = 15%. This calculator does the math instantly as you type.
How is percentage change calculated?▾
Percentage change equals (new value minus old value) divided by the absolute value of the old value, times 100. A positive result means an increase and a negative result means a decrease.
Can this calculator handle negative numbers and decimals?▾
Yes. All three calculator modes fully support negative numbers, decimals, and very large values. Results are formatted with up to six decimal places of precision.
Is my data safe when using this percentage calculator?▾
Yes. All calculations happen entirely in your browser. No data is ever sent to a server.