This policy describes how Eng Calculators reviews calculator methods, technical references, and external-tool listings.
Published calculators use an authoritative primary source and a corroborating source, worked example, or independent validation reference. Calculator methods are reviewed for formulas, units, numerical behavior, assumptions, limitations, and page context.
Vendor and standards-based tools may be recommended when they are more authoritative or maintain proprietary data. Their logic is not copied or reverse engineered.
A listed tool is checked against an official provider page before publication. The last-checked date records that link and relationship review; it is not an independent validation of the provider's calculations, curves, catalog data, availability, or configuration outputs.
External tool links and disclosures are reviewed quarterly and when users report broken or stale links. They are also reviewed before launch and major public content reviews. If a provider page moves or cannot be verified, the link is corrected, marked for review, or removed from the published directory.
Tool order is editorial and based on engineering relevance, official-source confidence, topic fit, and usefulness for input preparation. Sponsored, affiliate, or partner relationships must be disclosed near the relevant tool. Listings are editorial unless a relationship is disclosed on the relevant page.
Questions about a source, calculation method, review date, or external-tool listing can be sent to hello@eng-calculators.com.