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English interface

Percentage and discount calculator

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

ReviewedGeneral utility
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 examples 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
Recorded updates

Review history

Site changelog

Dates describe the review scope recorded below. A page update does not mean every source was checked again.

  1. Last recorded source/method review

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

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