We Open-Sourced 42 Construction Calculators — Here's Why

I run EstimatorSuite.com — we review construction estimating software for US contractors (HVAC, electrical, plumbing, roofing, landscaping). We just open-sourced our entire calculator suite: 42 construction calculators under MIT license. React + TypeScript + Tailwind. 🔗 Repo 🔗 Live Demo 🔗 npm What's included: • 36 material calculators (concrete volume, roofing squares, drywall, paint, flooring, etc.) • 6 trade estimators (HVAC load, electrical conduit fill, plumbing pipe sizing) Two entry points: → React components — drop into any project → Pure calculation functions — zero UI dependency, works in Node.js, Vite, Next.js, anywhere Why we built this: Construction software is expensive. Contractors told us they needed free tools that actually work — not ad-filled spreadsheets. So we built them, and we open-sourced them. Full story →