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Percentage and discount calculator

Calculate a percentage, ratio, change or discount with a visible formula.

ReviewedLow-impact
Saves this tool's name on this device only (up to 20). No form values.
Only visible result text is included. Form fields are not read. Review sensitive values before sharing.

Displays up to 6 decimal places. For discounts, A is the price and B is 0–100%. This is general arithmetic.

Enter values, then process to see the result.

How to use it

  1. Choose a mode and enter A and B.
  2. Process the values and check the formula.
  3. Copy the result or clear the form.

Important limitation

General arithmetic, displayed to at most six decimal places. This does not select a tax rate or accounting rounding rule.

The interactive form is fully localized in English.

Reviewed 2026-09-09; next review 2027-09-09.

Core calculations, cited sources and main test cases have been reviewed within the stated scope.

Sources

Understand Percent — Prealgebra 2eOpenStax, Rice University · opens in a new tabSupports the method and scope stated on the tool page; consult the source for case-specific rules.Source checked 2026-09-09
Traceable review record

Review history

Site changelog

This is the recorded review history available in the repository, not an inferred release history. Dates are added only when evidence is recorded.

  1. Current review snapshot recorded

    Core calculations, cited sources and main test cases have been reviewed within the stated scope.

    Method version: review-2026-09-09

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