How to report an issue
Email [email protected] with the page URL, the exact text or behavior, a source or reproduction case when available, and the date you checked it. Do not include sensitive financial documents.
How reports are reviewed
We first reproduce the issue, then check the relevant source, formula, markup, or browser behavior. A material formula or factual correction is reviewed in context so that related explanations, examples, metadata, and links do not remain inconsistent.
How changes are noted
Pages display a review date. When a correction materially changes a result or meaning, we update the date and add a concise explanation where it helps readers understand the change. Minor typographical or presentation fixes may not receive a separate public note.
Urgent accessibility issues
For a keyboard, focus, contrast, or screen-reader issue that blocks use of the calculator, put “Accessibility” in the subject line. We prioritize issues that prevent people from completing the core task.