Francesco Zinghinì
Author and curator of CementCalcs.
Author and curator · CementCalcs
Francesco Zinghinì is the author and curator of CementCalcs. This is a truthful role: I am not a licensed concrete contractor, a structural or civil engineer, or an ACI-certified finisher, and I do not claim any such trade credential.
My relevant, verifiable competence is building deterministic online calculators (open-source Python projects) and electronic-engineering training — rigor on the quantity and cost arithmetic. Every formula on this site shows its basis, every convention is cited under Sources, and every calculator is numerically self-checked against known values (see Methodology).
Everything here follows one rule: the tools must stay correct with no ongoing maintenance. That is why every cost tool works only on the quantities you measure and the prices you enter from your own quotes and bills — the site keeps no ready-mix or labor price list, no regional cost database and no live rates that would silently go stale. The only baked-in numbers are stable identities (1 yd³ = 27 ft³, area × thickness, π·r²·h, ceil for whole bags, grid geometry) and clearly labeled industry planning typicals (bag yields, coverage per yd³, thickness bands, rebar spacing, sub-base depth, waste %) you can adjust to your own project.
Concrete is a real spend, so every cost tool is framed as a planning estimate, not a bid; every quantity tool reminds you to confirm yield on your product’s bag and order a little extra for spillage and uneven subgrade; and the reference tools note their values are labeled typicals, not a structural design. The aim is a neutral, free, no-signup reference you can use to sanity-check a contractor’s numbers — nothing that pretends to replace a professional pour or an engineer.
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Reach me through the contact page.