A free suite of 34 concrete calculators plus AI tools for crack diagnosis and quote analysis — volume, bags, and cost.
SlabCalc is a free, no-signup suite of concrete tools built for contractors, estimators, and builders. At its core are 34 specialized calculators covering slabs, driveways, patios, footings, foundations, walls, CMU block, columns, curbs, stairs, sonotubes, rebar, gravel, and more — each returning volume in cubic yards and cubic meters, pre-mix bag counts, total weight, and a cost estimate, with an adjustable waste factor and an imperial/metric toggle.
Beyond estimating, SlabCalc adds two AI-powered tools built on Claude vision: a Concrete Crack Analyzer that diagnoses damage from a single photo — classifying it against six failure modes, scoring severity 1–5, and recommending DIY repair, a contractor, or a structural engineer — and a Quote Analyzer that breaks down a contractor's bid into labor, materials, and site prep, flagging anything that looks off.
Our cost figures are built from US state DOT paving bid records reprojected onto residential job sizes via the BLS producer price index — a transparent, disclosed methodology rather than a black box. Rounding out the platform: cost-by-city pricing pages, expert guides, a concrete glossary, a Chrome extension, and embeddable widgets. Free, no signup, runs entirely in the browser.
SlabCalc is a free, no-signup suite of concrete tools built for contractors, estimators, and builders. At its core are 34 specialized calculators covering slabs, driveways, patios, footings, foundations, walls, CMU block, columns, curbs, stairs, sonotubes, rebar, gravel, and more — each returning volume in cubic yards and cubic meters, pre-mix bag counts, total weight, and a cost estimate, with an adjustable waste factor and an imperial/metric toggle.
Beyond estimating, SlabCalc adds two AI-powered tools built on Claude vision: a Concrete Crack Analyzer that diagnoses damage from a single photo — classifying it against six failure modes, scoring severity 1–5, and recommending DIY repair, a contractor, or a structural engineer — and a Quote Analyzer that breaks down a contractor's bid into labor, materials, and site prep, flagging anything that looks off.
Our cost figures are built from US state DOT paving bid records reprojected onto residential job sizes via the BLS producer price index — a transparent, disclosed methodology rather than a black box. Rounding out the platform: cost-by-city pricing pages, expert guides, a concrete glossary, a Chrome extension, and embeddable widgets. Free, no signup, runs entirely in the browser.
See SlabCalc in action through screenshots and short videos.
See how SlabCalc stacks up against similar tools before you decide.
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