Math Tool

Percent Calculator

Quickly find percentages, reverse percentages, and percentage change — all in one simple tool.

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1. What is X% of Y?

Percentage (X)

Base value (Y)

Result

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2. X is what % of Y?

Part (X)

Whole (Y)

Result

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3. Percentage change

Old value

New value

Result

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Positive = increase, negative = decrease.