X is what % of Y?
is what % of
What is Y% of X?
% of
Percentage change
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How to Use
Choose a calculation mode (X% of Y, percentage change, ratio). Enter your numbers and get instant results.
Frequently Asked Questions
How do I calculate percentage change?
Percentage change = ((New - Old) / Old) × 100. The tool calculates this automatically.
What is X% of Y?
To find X% of Y, multiply Y by X/100. For example, 20% of 150 = 150 × 0.20 = 30.
Can I calculate reverse percentages?
Yes. If you know the result and percentage, the tool can find the original number.