Corrections and Updates

A useful correction identifies what is wrong and gives enough evidence to reproduce or verify the issue. Please include:

• The page URL and the specific statement or result.
• A short explanation of the concern.
• A current authoritative source, or the steps and inputs needed to reproduce a tool problem.
• Whether the problem affects a definition, calculation, attribution, link or other detail.

Use the contact page for the current reporting address. Do not include private customer data, credentials or payment information.

How corrections should be handled

A report should be checked against the underlying source or reproduced in the tool. A substantive correction should update the affected explanation, example, formula or source and its revision date. Related pages should also be checked when they rely on the same claim.

Edition history

14 November 2026: initial rebuilt edition prepared with original guides, transparent calculator methods and original templates. No public correction history from a prior operator is asserted.