All Unit Conversions

Editorial Policy

Last updated: 9 November 2026

This page explains how the calculators, printable charts and guides on AllUnitConversions.com are produced, checked and corrected. Where conversion factors come from, and how precision is handled, is covered on the About page.

Who is responsible

Every page is the responsibility of Miguel Coelho, who created and maintains the site. Pages show who maintains them and when they last changed. A review date only changes when a page has actually been re-checked.

What every page must meet

  • Values come from the shared conversion library, which stores exact definitions (for example 1 in = 25.4 mm) from BIPM, NIST and the relevant standards bodies.
  • Formulas and rounding rules are stated, so you can reproduce any number yourself.
  • Approximate or conventional figures (planning fuel densities, typical container volumes) are labelled as such, never presented as constants.
  • A page should exist because it is useful to someone doing a real task. We do not publish near-duplicate pages to target search variations.

How values are checked

Chart tables and calculator results are generated from the same library rather than typed by hand. Automated tests recompute published values from the exact factors and fail if anything drifts. Printable PDFs are generated from the same data as the web pages, and each new chart or guide is reviewed by a person before it is published.

Use of AI assistance

We use AI tools to help draft explanatory text, build page layouts and write code. AI output is never published unchecked: numbers come from the conversion library and its tests, not from a language model, and every page is reviewed and approved by Miguel Coelho before it goes live. If you find text that is wrong or unhelpful, please tell us.

Independence and advertising

  • The site may show advertising to cover its costs. Advertisers have no influence over content, and ads are kept visually separate from calculators and results.
  • We do not accept payment for links, rankings or reviews, and we do not publish pages that rank our own site against competitors.
  • Directory listings we have submitted are listed plainly on our directory listings page; they are not endorsements.

Corrections

If a value, label or explanation is wrong, email support@allunitconversions.com with the page URL, the units and value you used, the result you expected and, if possible, the standard you are citing. Confirmed errors are fixed promptly, the affected pages and PDFs are regenerated, and the page's updated date changes to reflect the correction.