Why this site exists
A weight conversion should not require an account, a tutorial, or a search through advertising. The calculator is the product: inputs appear near the top, results update immediately, and supporting material explains the math when you need it.
How calculations are handled
Unit constants live in one shared calculation file. The international avoirdupois pound is treated as exactly 0.45359237 kilograms. Ounce and stone relationships use exactly 16 oz per lb and 14 lb per st. Readable results are rounded only for display. The calculation methodology documents the sources, parser, precision, and tests.
Scope and independence
The site does not provide live carrier rates, airline policies, medical diagnoses, or professional advice. It does not claim affiliations with airlines, shipping carriers, retailers, gyms, or standards organisations.
Privacy-minded design
The static site has no user accounts, advertising scripts, remote fonts, or third-party calculator code. Calculator inputs are processed in the browser. Google Analytics is used to understand general site usage; the Privacy Policy explains the current analytics setup.
Questions or corrections are welcome through the contact page.