Construction Calculators
Thirty free calculators covering every stage of a build or renovation — from the concrete in the ground to the BTUs in the air. Enter your measurements in imperial or metric units and get instant, verifiable material estimates with the math shown. Every result is a planning estimate: perfect for budgeting and ordering, and always worth a professional’s review before you commit to structural, HVAC, or code-regulated work.
Browse by project area
Concrete3 calculators: Concrete, Concrete Slab, Concrete BagLandscaping5 calculators: Gravel, Mulch, Topsoil, and moreMasonry2 calculators: Brick, Block (CMU)Flooring2 calculators: Flooring, TilePainting2 calculators: Paint, WallpaperDrywall1 calculator: DrywallFraming1 calculator: StudDecking2 calculators: Deck Board, Deck MaterialFencing1 calculator: FenceRoofing3 calculators: Roofing, Roof Pitch, ShingleStairs1 calculator: StairLumber2 calculators: Board Foot, LumberArea1 calculator: Square FootageHVAC3 calculators: BTU, AC Size, InsulationEstimating1 calculator: Cost Per Square Foot
Popular tools
Concrete CalculatorEstimate cubic yards and pre-mix bags for slabs, footings, columns and piers.ConcreteRoofing CalculatorEstimate roofing squares, underlayment rolls, drip edge, and ridge cap for gable or hip roofs.RoofingPaint CalculatorGallons, wall area, and primer — from room dimensions or total area.PaintingFence CalculatorEstimate pickets, posts, rails, and concrete bags for any wood fence run.Fencing
Frequently asked questions
Each tool turns your measurements into a concrete (pun intended) material or cost answer: cubic yards of concrete, gallons of paint for a room, bundles of shingles for a roof, BTUs to heat a space. Every tool page shows its formula and worked examples so you can verify the number yourself.
Usually, yes — and each tool bakes in sensible guidance. Tile and flooring tools apply a standard waste factor for cuts; aggregate tools remind you that compaction and settling change delivered volume. The assumptions section on every page states exactly which waste factor was used and why.
No. They are planning estimates for budgeting and ordering materials. Structural work, HVAC sizing, stair geometry, and roofing all have code requirements that vary by location — get a licensed professional to sign off before you build.
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