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UnitConverterOne
Unit converters that show the formula.
UnitConverterOne is a set of fast, clear unit converters built with Astro as a fully static site on Cloudflare Pages, with no database and no server.
Each page shows the formula behind its answer so people can check the maths, ships only about 3 KB of JavaScript, and is covered by an automated test suite for the maths, number formatting and page metadata.