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Percentage Calculator

Solve nine common percentage questions with the formula shown.

Numbers stay in your browser.

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What Percentage Calculator does

Calculate portions, proportions, changes, adjusted values, original values and relative differences with nine mode-specific formulas and validation.

Privacy and processing

Numbers stay in your browser. Entered values remain in the current page session and are not included in analytics or monitoring.

How to use Percentage Calculator

  1. 1Choose the question that matches your calculation.
  2. 2Enter the clearly labelled values and choose display precision.
  3. 3Review the unrounded calculation steps and copy the result.

Common uses

  • Checking a price change
  • Finding a portion of a total
  • Reversing an increased or decreased value

Limitations

  • Division by zero and other undefined cases are rejected.
  • Precision changes display only; intermediate calculations are not over-rounded.

Frequently asked questions

What is percentage change?

It is the change divided by the original value, multiplied by 100. Percentage points describe a different change between two percentage rates.

Is percentage difference directional?

The two-value difference mode uses the average magnitude as a symmetric reference; increase and decrease modes are directional.

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