Werkery

Percentage Calculator

Solve any percentage problem: X% of Y, X is what percent of Y, percentage change from X to Y, percentage increase/decrease.

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What is X% of Y?
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X is what % of Y?
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Percent change from X to Y
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How it works

  1. 1
    Pick equation
    Three common forms covered.
  2. 2
    Fill in
    Two numbers.
  3. 3
    Read
    Live result.

Frequently asked

What is percent change?

((new - old) / old) × 100. Positive = increase, negative = decrease. Going from 50 to 60 is a 20% increase; going back from 60 to 50 is a 16.67% decrease — they're not symmetric.

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Tool designed and editorially reviewed by Felix Brübach. Text drafted with AI assistance and reviewed for legal and factual accuracy before publication. Not legal advice — for complex cases, consult a lawyer.
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