CalcFi

300+ free financial calculators built with Next.js — 22K+ SSG pages, embeddable widgets

Open-source-friendly financial calculator hub built with Next.js 16, React, and Tailwind CSS. 300+ interactive calculators, 22,000+ statically generated pages with localized data for all 50 US states. Free embeddable widgets — one line of code to add any calculator to your site.