Concrete Slab Estimator
Estimate cubic yards and bag counts for rectangular concrete slabs.
Measure twice. Order once.
141 free US construction calculators — cubic yards, board feet, roofing squares, rebar pounds, and jobsite cost takeoffs with live diagrams.
Try it live
Dial in a US slab. Watch cubic yards and 80 lb bags update.
A ready-mix style takeoff in feet and inches — no sign-up, and nothing you type ever leaves your browser.
Slab dimensions
Educational estimate only. Not engineering or code advice. Confirm with your ready-mix plant, supplier, and local US building department.
Concrete needed
0 yd³
Feature set
Built for US takeoffs, not toy math.
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US units first
Defaults to feet, inches, cubic yards, and pounds. Switch to metric anytime — outputs update live.
Open unit converter -
Live diagrams
See slabs, walls, stairs, and volumes reshape as you adjust dimensions.
Try stair diagram -
Waste & bag yields
Dial waste factors and bag sizes so orders land closer to reality.
Open bag calculator -
Cost & labor
Stack material unit prices and crew rates into a rough job estimate.
Open cost estimator -
Charts, PNG & share links
Donut, bar, and gauge takeoff charts — save as PNG, copy a hash URL, or share from your phone.
Open slab charts
Categories
Every trade desk on one site.
Browse by trade — each category lists its calculators. Open any tool, or view the full category page.
Concrete & Cement
Slab, footing, column, mix, and bag calculators for US poured concrete — cubic yards and 60/80/90 lb bags.
- Concrete Slab Estimator
- Concrete Column Calculator
- Concrete Footing Calculator
- Concrete Mix Ratio Calculator
- Cement Bags Calculator
- Sidewalk Concrete Calculator
- Driveway Concrete Calculator
- Patio Slab Calculator
- Concrete Formwork Calculator
- Bag Yield Concrete Calculator
- Foundation Wall Concrete Calculator
- Water-Cement Ratio Helper
Masonry & Brick
Brick, block, mortar, and wall-tie estimators for masonry crews.
Framing & Lumber
Studs, joists, board feet, decks, and fence framing takeoffs.
Roofing
Pitch, squares, shingles, and roof material planning tools.
Flooring & Tile
Floor area, tile counts, waste, and covering estimators.
Paint & Coatings
Coverage, coats, wallpaper, and coating quantity tools.
Excavation & Earthwork
Cut, fill, gravel, sand, haul, and dumpster volume calculators.
Drywall & Insulation
Sheet counts, insulation R-value, and finish material estimates.
Stairs, Ramps & Access
Stair rise/run, ramp slope, and access geometry helpers.
Asphalt & Paving
Asphalt tonnage, base, and paving area estimators.
Cost & Labor
Material cost, labor hours, and budget planning calculators.
Plumbing Takes
Pipe volume, runs, and plumbing material takeoff helpers.
Electrical Takes
Wire, conduit, and electrical rough-in estimating tools.
Area, Volume & Units
Shapes, converters, waste factors, and generic dimension tools.
- Construction Unit Converter
- Circle Area Calculator
- Triangle Area Calculator
- Trapezoid Area Calculator
- Cylinder Volume Calculator
- Rectangle Area & Volume Calculator
- Waste Factor Quantity Calculator
- Bag Yield Coverage Calculator
- Mix Ratio Parts Calculator
- Form Contact Area Calculator
- Scaffolding Bay Estimator
- Generic Haul Trips Calculator
Featured tools
Start with these takeoffs.
Concrete Column Calculator
Find concrete volume for round or rectangular columns and piers.
Concrete Footing Calculator
Estimate concrete for continuous and pad footings by size.
Concrete Mix Ratio Calculator
Convert mix ratios into batch quantities for cement, sand, and aggregate.
Cement Bags Calculator
Estimate cement bag counts from mix volume and bag size.
Sidewalk Concrete Calculator
Estimate concrete for sidewalks and walkways by length and width.
Driveway Concrete Calculator
Estimate yards of concrete for residential driveways.
Patio Slab Calculator
Calculate concrete for outdoor patio slabs and seating pads.
Concrete Formwork Calculator
Estimate contact area of forms for walls, slabs, and columns.
Bag Yield Concrete Calculator
Convert bag yields into pour coverage for a given thickness.
Foundation Wall Concrete Calculator
Estimate concrete for poured foundation and basement walls.
Water-Cement Ratio Helper
Estimate water quantity from cement weight and target ratio.
About BuildToolsHub
Built for American jobsites.
BuildToolsHub is a free suite of US construction calculators for contractors, remodelers, estimators, and DIY builders. Work in feet and inches, order ready-mix by the cubic yard, count 60/80/90 lb bags, board feet, roofing squares, and rebar by the pound.
Outputs are educational estimates only. Always verify with suppliers, licensed professionals, and your local US building department before you order or pour.
Runs in your browser
Takeoffs run locally on your device. The theme does not upload the numbers you type — share links only encode values in the URL hash when you choose to copy or share them.
- 140+ tools in US construction units
- Ready-mix yards, bagged concrete & lumber takeoffs
- Charts, shareable links, print & CSV export
- USD pricing helpers — no account required
- Calculations stay on your device