Editorial standards

Who publishes this site

UnitCalConv is an independent website run by SM Arijul Islam, who founded it and is responsible for everything published on it. There is no parent company, no investor and no sponsored content programme. The site is funded by advertising shown alongside the tools, and every advertising decision is kept separate from what the pages say. You can reach him through the contact page; correspondence about corrections, privacy or advertising is read and answered there.

We publish in British English for an international audience. The tools are written for everyday users — students, tradespeople, cooks, travellers, hobbyists and professionals doing a quick check — not as a substitute for a qualified professional’s judgement.

What we publish, and what we leave out

Each converter and calculator covers a single, well-defined task with a stated formula and a worked example. Around the tool we publish the explanation, the reference values, the assumptions and the limitations that a reader needs in order to use the result sensibly. Longer guides cover the background behind a group of tools: where a conversion factor comes from, which convention applies in which country, and the mistakes that cause real-world errors.

We do not publish pages that exist only to fill a keyword gap. A tool is added when it has a clear use, a formula that can be checked and enough substance to explain. If a topic cannot be covered accurately in the space available, it is left out rather than padded with generic text.

How a page is researched and written

Every page starts with the underlying definition or formula, not with a draft of the prose. For unit conversions the first stop is the primary standard: the BIPM SI Brochure for SI units, NIST Special Publication 811 for US customary conversions, and the relevant ISO or industry standard where one exists. For health, finance and education pages we start with the body that defines the measure — the World Health Organization and CDC for BMI, the Consumer Financial Protection Bureau for loan mechanics, and the awarding body or institution for grading scales — and state plainly when a calculation is a population estimate rather than individual advice.

Secondary sources are used to explain context, not to establish a number. Wikipedia, calculator aggregators and unattributed conversion tables are not treated as authorities. Where a convention genuinely varies — the size of a cup, the definition of a marla, the divisor used for volumetric freight — the page says so and gives the convention it uses.

How calculations are checked

Each formula is recalculated by hand against at least two worked examples before publication. The examples are chosen to exercise the parts that are easy to get wrong: a zero or negative input, a unit at the edge of the supported range, a conversion that runs in both directions, or a case where the result should be rounded. The reference table on the page is generated independently of the interactive tool, so a coding error in one is unlikely to be repeated in the other.

Converter pages use exact definitions where they exist — 1 inch is exactly 25.4 mm, 1 pound is exactly 0.45359237 kg, 1 mile is exactly 1.609344 km — and avoid rounded factors in the calculation itself. Results are displayed to eight significant digits by default, which is more precision than most tasks need; the page explains when rounding matters. Calculators that depend on a convention rather than a constant (cup sizes, mesh openings, yarn counts, grading scales) identify the convention explicitly.

The interactive tools run entirely in the browser. There is no server-side calculation to drift out of sync with the explanation, and no result is stored or transmitted. We test each page in current versions of Chrome, Firefox, Safari and Edge, at phone and desktop widths, with keyboard-only navigation and with reduced motion enabled.

Review dates and updates

Every tool page and guide carries a visible last reviewed date. The date changes only when the page has actually been checked — not when the file is reformatted, not when a stylesheet changes and not on a fixed schedule for appearance. Pages covering health, finance and education are reviewed at least twice a year, or sooner when a standard, rate or guideline changes. Currency pages show the date of the rate snapshot they are using, so a stale feed is visible rather than hidden.

When a correction changes a result, the page is updated and the review date is moved forward. When the change is only a clarification, the review date still moves if the page was re-read and confirmed. We do not quietly delete an inconvenient passage; if a claim was wrong, the correction is described in the page’s change note or in the reply to the person who reported it.

Corrections and how to report one

Accuracy is the point of a converter, so error reports are the most useful messages we receive. The report an error page lists what to include: the page, the value and units you entered, the result you saw and the result you expected. A report with a reference — a standard, a textbook, a manufacturer’s data sheet or a second independent tool — is normally enough to confirm a fix.

We aim to acknowledge reports within a few business days and to correct confirmed arithmetic errors promptly. If the disagreement is about a convention rather than an error, the page is amended to explain which convention it uses. Every tool page also links to the report form in its byline, so the route is never more than one click away.

Sources we rely on

Our source hierarchy is deliberately narrow. We prefer, in order: the defining standards body or regulator; the national agency responsible for the measure; a manufacturer’s published data sheet where the value is product-specific; and a peer-reviewed or formally published reference for context. The guides list the sources used for each long-form article, and the tool pages that depend on a health, finance or education formula link to the relevant guidance in their sources section.

Where no single authority exists — for example, regional land units or historical measures — we say that the figure is a convention and give the range of values in use. We do not present a local custom as a universal fact.

Advertising and editorial independence

Advertising pays for the site. It does not buy coverage. Advertisers cannot commission a tool, choose a formula, influence a reference table or have a page amended to suit a product. There are no affiliate links, no paid rankings and no “sponsored” tools. Ads are placed outside the calculator panels, never between a result and its explanation, and never styled to look like a button or a result field. If an advertisement interferes with a tool, that is a fault: please report it and it will be fixed.

The site uses Google AdSense. Advertising cookies are described in the Privacy Policy, and non-essential cookies are loaded only after a visitor chooses. Declining advertising cookies leaves every converter and calculator fully usable.

Use of automation

Calculations are performed by JavaScript in your browser. Internally, we use scripts to check links, validate structured data, compare reference tables and catch regressions when a page changes. Those checks support the editorial process; they do not replace it. Every published page is read and approved by a person, and a page is not published merely because a template can generate it. We do not use automated tools to invent quotations, credentials, reviews or sources.

Independence, ownership and contact

UnitCalConv is editorially independent. The site has no financial relationship with any of the standards bodies, agencies or manufacturers it cites, and a citation is not an endorsement by them. For questions about this policy, corrections, privacy or advertising, use the contact page. See also our About page, Terms of Service and Disclaimer.