Concrete Calc - Slab Estimator

The fastest concrete calculator built for job sites — not classrooms. Whether you're pouring a driveway slab, setting fence posts, forming footings, or building columns, ConcreteCalc gives you accurate cubic yards and bag counts in seconds. Just enter your dimensions and get results. No ads. No internet required. No guesswork. CALCULATE ANYTHING CONCRETE Rectangular Slab — driveways, patios, garage floors, sidewalks Circular Slab — round pads, column bases Footing — foundation footings, wall footings Column — round or square concrete columns Post Holes — fence posts, deck posts, sign posts Tube Forms — Sonotube and tube form calculations BUILT FOR HOW CONTRACTORS ACTUALLY WORK Enter dimensions in feet and inches — not decimals. ConcreteCalc speaks job site language. Results instantly display in cubic yards for ready-mix orders and number of bags for pre-mix work. Toggle between 40lb, 60lb, and 80lb bag sizes with one tap. The screen stays on while you're calculating — no fumbling to unlock your phone mid-pour. FREE — NO SUBSCRIPTION FOR CORE CALCULATIONS Every concrete calculation is free forever. No account required. Works completely offline on the job site, in basements, and in dead zones. PRO TOOLS FOR SERIOUS CONTRACTORS Upgrade to ConcreteCalc Pro to unlock: - Material Cost Estimator — enter your price per yard or bag cost, get total job cost instantly - Save & Name Calculations — store estimates by project name, access them anytime - PDF Export — send professional material estimates to clients or keep for records - AI Job Estimator — describe your pour in plain English, get a full material breakdown - Waste Factor — add 5–15% overage automatically so you never run short Pro is $2.99/month or $19.99/year. One subscription, every calculation, forever. WHY CONTRACTORS CHOOSE CONCRETECALC Most concrete calculator apps were built for civil engineers or students. ConcreteCalc was built for the person standing on a job site in work boots who needs a number fast. Imperial-first. Offline-first. Contractor-first. If you pour concrete for a living — or even once a year — this is the only concrete calculator you need.