How do I calculate the percentage of a number?

To find X% of Y, use: Result = (X ÷ 100) × Y. For example, 20% of 500 = (20 ÷ 100) × 500 = 100.

How do I calculate percentage change?

Percentage change = ((New Value − Old Value) ÷ |Old Value|) × 100. A positive result means an increase; negative means a decrease.

Divide the part by the whole and multiply by 100. For example, 25 out of 200 = (25 ÷ 200) × 100 = 12.5%.

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Three modes: find a percentage, express as a percentage, or calculate percentage change.

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How to find X% of a number?

Formula: (X ÷ 100) × Y — e.g., 20% of 500 = 100

How to calculate percentage change?

Formula: ((New − Old) ÷ |Old|) × 100 — positive = increase, negative = decrease

How to express X as % of Y?

Formula: (X ÷ Y) × 100 — e.g., 25 out of 200 = 12.5%

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