Most converters give you "1 lb = 0.4536 kg" and stop. UnitFormula gives you 2,000 words of history, industry context, worked examples, common mistakes, and 7 FAQs — for every one of 187 conversion pairs. Plus 44 interactive calculators (electrical, finance, health, construction, cooking) and 30 educational guides. All free, no login required. Built with Next.js 15, 347 statically-generated pages, 4 JSON-LD schemas per page.