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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 →