I built ProjectCalc — a free library of 73 calculators for construction, home improvement,

and DIY projects. No signup, no popups, no AI chatbot, runs entirely in your browser. Stack: Next.js 16 (App Router) +

TypeScript + vanilla CSS, deployed on Vercel.

Source: github.com/sabanite08/projectcalc

## Why

Every existing construction calculator on Google is buried under cookie banners, popup signups, AI chatbots, and ads.

The Reddit answer to "how much concrete do I need" is always a screenshot from someone else's calculator because the

original site is unusable.

So I built the version I wanted: dead simple, fast, no friction.

## What shipped

73 calculators across 6 categories:

Carpentry — beam span, header size, stair stringer, rafter length, floor joist span, snow load, plywood sheets, lumber cuts, framing

Electrical — voltage drop (NEC), conduit fill (Chapter 9), wire gauge (Table 310.16), panel load (NEC 220), circuit breaker (240.6), conduit bending, generator sizing

Plumbing —…