Calculate materials.
Build with confidence.
20 free calculators for concrete, paint, tile, decking, and more. Metric and imperial. No signup, no ads.
Concrete & Masonry
Concrete Calculator
Volume and bag count for slabs, footings, and posts
Calculate →Footing Calculator
Concrete volume for continuous and pier footings
Calculate →Rebar Calculator
Bar count, spacing, and total length for slabs
Calculate →Paver Calculator
Pavers, base material, and sand for patios and walkways
Calculate →Landscaping
Deck & Outdoor
Deck Board Calculator
Boards, joists, and fasteners for any deck size
Calculate →Deck Stain Calculator
Stain or sealer quantity for any deck size
Calculate →Fence Calculator
Posts, rails, pickets, and concrete for fence projects
Calculate →Stair Calculator
Rise, run, stringers, and code-compliant dimensions
Calculate →Interior & Exterior
Paint Calculator
How much paint for walls, ceilings, and trim
Calculate →Wallpaper Calculator
Rolls needed based on pattern repeat and room size
Calculate →Drywall Calculator
Sheets (plasterboard), compound, and tape for walls
Calculate →Insulation Calculator
Batts, blown-in, or spray foam for any R-value
Calculate →Flooring & Tile
Framing & Structure
About BuildMathCalc
BuildMathCalc provides free, accurate construction calculators for homeowners, DIYers, and professional tradespeople worldwide. Every calculator accounts for real-world waste factors, common material sizes, and practical installation requirements so you buy the right amount the first time.
How to Use These Calculators
Enter your project dimensions, choose your materials, and get instant results. Each calculator shows total quantities, a step-by-step breakdown of the maths, and practical tips for ordering.
All calculators support both imperial (feet, inches) and metric (metres, centimetres). Toggle the unit switch at the top of any calculator page. Results display in whichever system you choose, with equivalent conversions where helpful.