I built ProjectQty to make construction estimates easier to inspect

I built ProjectQty because construction calculators often hide the math behind the final number. The goal is to make quantity estimates more transparent: 41 free calculators for concrete, gravel, roofing, flooring, landscaping, and related materials, with formulas, assumptions, rounding, and unit conversions visible to the user.

It is built as a free browser-based tool, with project guides stored locally in the browser. I would love feedback from other makers on whether the positioning is clear and whether the calculator pages explain the formulas well enough for DIY planners and small construction teams.