Editorial Policy

Explanatory content is written specifically for each calculator, describing that formula's actual variables, assumptions, and use cases rather than reused generic boilerplate. Where a page needs to say something similar to another page - because two calculators genuinely share an assumption or a caveat — that's a deliberate, factual overlap, not copied filler.

Every formula is checked against authoritative references before publication, and every calculator is tested against independently computed known-answer cases. The full process is on the Accuracy & Methodology page.

Search indexing issues are not treated as a reason to rewrite pages blindly. When Google reports a page as crawled but not indexed, the page is reviewed for thin content, weak internal links, missing user guidance, stale review status, duplicate intent, and unclear limitations. If the calculator is useful but the page needs stronger context, we improve the page and keep a dated internal review log before requesting reprocessing.

Calculators and content on this site are developed with AI-assisted tools as part of the writing and engineering process - drafting explanatory text, writing and reviewing code, and helping verify formulas against references. AI assistance is used as a drafting and development aid, not as an unverified source of technical claims: every formula is independently checked against real references and tested with known-answer cases before it's published, exactly as described on the Accuracy & Methodology page. This disclosure is here because we'd rather tell you plainly than have you wonder.

When a reported error is confirmed, the formula, its tests, and its surrounding explanation are corrected together, and the page's reviewed date is updated. Corrections aren't hidden - a wrong result that's been fixed is a normal, expected part of maintaining a large reference site, not something to bury.

Where a calculator page cites a source, it's a real, checkable reference - a textbook, a standards body, or an established technical publication - not a placeholder or an invented citation.

Each calculator page shows the date it was last reviewed. An older review date doesn't mean the page is wrong; it means it hasn't needed a fresh pass since that date. When a page receives a substantial content, formula, UX, or indexing-quality review, that date is updated so readers can see the maintenance history at a glance.

This site doesn't invent author biographies, credentials, years of experience, or institutional affiliations to make a page look more authoritative than it is. See About for a plain description of who operates this site.

Advertising, if and when it appears on this site, does not influence a formula, a calculated result, or an educational conclusion. Editorial content is decided independently of any advertising relationship.