How do I calculate X% of Y?

Multiply Y by X and divide by 100. For example, 15% of 200 = 200 × 15 / 100 = 30.

How do I find what percentage X is of Y?

Divide X by Y and multiply by 100. For example, 30 is what % of 200? Answer: 30/200 × 100 = 15%.

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Calculate percentages three ways: X% of Y, X is what % of Y, and percentage change between two values. Free online percentage tool.

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