How to calculate percentage change?

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Percentage Calculator

Calculate percentage of a number, what percentage X is of Y, and percentage increase or decrease with clear formulas.

Percentage (X %)

Total Amount (Y)

Calculated Result

15% of 200 is equal to 30.00

Formula:(15 ÷ 100) × 200 = 30.00

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Choose X% of Y, What % is X of Y, or Percentage Change.

Fill in the two input values.

Instant calculated answer with step-by-step mathematical explanation.

verifiedThree Practical Modes

Solves standard percentage problems, ratios, and growth/decline rates.

verifiedStep-by-Step Breakdown

Transparent mathematical formula shown beneath the answer for easy verification.

Formula: ((New Value - Old Value) / |Old Value|) × 100.

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