Editorial Policy
Last updated 14 August 2026
This page explains how the content on www.convertwise.com is produced, checked and corrected, and how advertising relates to it. We publish it because a reference site is only as good as the process behind it.
Where our figures come from
Every conversion factor traces back to a primary definition rather than to another website:
- The inch as exactly 25.4 mm and the pound as exactly 0.45359237 kg, from the 1959 international yard and pound agreement.
- SI base and derived units as defined by the International Bureau of Weights and Measures.
- Race distances as published by World Athletics; paper sizes from the ISO 216 standard.
- Baggage and shipping rules from the carriers' own published conditions, dated at the time of writing.
How pages are produced
- Question first. A page exists because people need that specific answer, not because a keyword tool suggested it.
- Calculate, don't copy. Numbers are computed from the defining factor at full precision, then rounded once for display.
- Explain the method. Every result is shown with the formula so a reader can verify it independently.
- Second pair of eyes. A reviewer who did not write the page checks the figures before publication.
Rounding
We calculate at full precision and round only the displayed value — normally to two decimal places, or four where the result is below one. Where rounding could mislead, such as an airline weight limit, we say so on the page.
Corrections
If we get something wrong we fix it and, where the meaning changed, we say what changed. Report an error to hello@convertwise.com with the page address; confirmed corrections are normally published within a week. We would rather receive an awkward correction than leave a wrong number online.
Advertising and independence
This site is funded by advertising, which keeps it free to use. Advertisers have no influence over what we publish, no advance sight of articles and no ability to have content changed or removed. Advertising slots are visually separated and labelled. We do not publish paid guest posts, sponsored links or paid reviews.
Artificial intelligence
We use software to compute values and to generate the repetitive scaffolding of a large reference site — that is what makes a table of hundreds of values feasible. Explanations, guides and articles are written and edited by people, and every published figure is verified against its defining source by a human before it goes live.
Updates
Definitional figures rarely change, so those pages are stable by design. Content that depends on third-party rules — baggage allowances, courier divisors, race regulations — is reviewed at least annually and after any change we become aware of.
Contact
Editorial questions, corrections and content requests: hello@convertwise.com.