Free Online Construction Calculators for Every Project
Free online calculators built for contractors, builders, and DIY homeowners estimate materials, costs, and quantities for concrete, roofing, lumber, paving, and landscaping projects, with formulas based on ASTM and ACI 318 industry standards.
Browse Calculators by Category
Every calculator is organized by trade: find your project type below, from concrete work to interior finishing.
Concrete Calculators
Estimate blocks, slabs, footings, and reinforcement for any concrete project.
Paving & Driveway
Calculate asphalt, stone, and base materials for driveways and paths.
Roofing Calculators
Work out pitch, shingles, and materials before you climb the ladder.
Lumber & Framing
Measure board feet, studs, and sheet goods for carpentry projects.
Landscaping Calculators
Estimate gravel, mulch, and soil for outdoor and garden projects.
Fence & Hardscape
Plan stairs, fences, and retaining walls with accurate counts.
Built for Accurate Jobsite Estimates
Industry-Standard Formulas
Every calculator uses formulas from recognized standards, including ASTM specifications and ACI 318 guidelines, not rough approximations. You get the same reference methods contractors and material suppliers use.
Worked Examples on Every Page
Each tool includes a worked numerical example, so you can verify the math yourself before ordering materials. Every formula cites its source standard; you can check our methods, not just our answers.
Regional Pricing Built-In
Material prices vary by region, so our cost calculators include reference pricing for the US, UK, Canada, and Australia, helping you budget realistically wherever your project is.
How Our Calculators Work
Enter your dimensions
Length, width, height, or area, depending on your project type.
Choose your materials
Block sizes, mix types, coverage rates, or material grades.
Get your estimate
Material quantities with waste allowance, plus cost ranges where pricing applies.
Frequently Asked Questions
Yes, every calculator on WorksiteCalc is completely free, with no sign-up, no downloads, and no usage limits. All tools run directly in your browser.
Our formulas follow industry standards like ASTM and ACI 318, and estimates include standard waste factors. Always confirm final quantities with your supplier, since site conditions and product specifications vary.
Yes, calculators support both feet/inches and metric measurements, so they work for projects in the US, UK, Canada, and Australia.
Contractors, builders, masons, carpenters, and DIY homeowners, anyone who needs fast, verifiable material estimates without doing manual formula work.
Our tools provide material estimates for planning purposes. For binding quotes, verify quantities against your project drawings and local supplier specifications.