Free construction & home-improvement calculators
36 free calculators that tell you exactly how much material to buy — bags of concrete, cubic yards of mulch, boxes of tile, gallons of paint, and more. Instant results, imperial units, no signup.
Browse by category, or jump straight to a calculator.
Concrete & Masonry
Flooring & Tile
Landscaping & Gardening
Patios, Decks & Fencing
Walls, Paint & Insulation
Roofing, Site Work & Utilities
About these calculators
Are these calculators free?
Yes. All 36 calculators on BuildCalcs are free to use with no signup. Each one runs instantly in your browser and shows the formula and a worked example.
What units do the calculators use?
Calculators use US/imperial units by default — feet, inches, square feet, cubic yards, tons, gallons, and bags — which is how building materials are sold in the US, UK, Canada, and Australia.
How accurate are the results?
Results are estimates based on standard formulas and typical material yields, with sensible waste allowances. Always confirm against product specs and local building codes before buying.