How do I calculate X% of a number?

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

How do I calculate percentage change?

((New - Old) / Old) × 100. For example, from 50 to 75: ((75-50)/50) × 100 = 50% increase.

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Calculate percentages in three common ways: X% of Y, what % is X of Y, and percentage change from X to Y.

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X% of Y, what % is X of Y, and % change between two numbers.

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