About SiteCals
SiteCals is a free online library of construction calculators and building cost estimators. Our goal is simple: turn the complex math behind a construction project — concrete volumes, roofing materials, framing counts, flooring areas, HVAC sizing, and more — into fast, accurate estimates that anyone can run in seconds.
Whether you are pricing a backyard patio, ordering materials for a remodel, or sanity-checking a contractor’s quote, SiteCals gives you the numbers to plan with confidence.
Who SiteCals Is For
- Contractors and builders who need quick, reliable material takeoffs and cost estimates on the job or in the office.
- Homeowners and DIYers planning renovations, repairs, or new builds who want to understand what a project really requires.
- Students and estimators learning how construction quantities and costs are calculated in the real world.
What Our Calculators Cover
SiteCals offers 100+ free calculators across the major construction trades, including:
- Concrete & masonry — slab volumes, bag counts, footing and wall concrete, block and brick quantities.
- Roofing — roof area, shingle bundles, pitch and rafter calculations, cost estimates.
- Framing & lumber — stud counts, board feet, joists, rafters, and sheathing.
- Flooring & finishes — tile, hardwood, laminate, carpet, and paint coverage.
- HVAC & electrical — BTU sizing, wire and breaker estimates, and load calculations.
- Site work & landscaping — gravel, topsoil, mulch, sod, excavation, and grading volumes.
Every calculator supports both metric and imperial units, so you can work in meters or feet, kilograms or pounds — whichever fits your project.
Our Approach to Accuracy
We take accuracy seriously. Each calculator is built around standard, widely accepted construction formulas — the same math taught in trade schools and used on job sites every day. You can read more about how we produce and verify our tools in our Editorial Policy.
That said, honesty matters more to us than hype. Our calculators produce estimates for planning, budgeting, and material ordering — not engineering certifications. Real-world conditions vary: soil, waste, product specifications, local building codes, and installation methods all affect final quantities. Always verify critical numbers with a licensed contractor or engineer before purchasing materials or starting work. Our full Disclaimer explains these limitations in detail.
Free, Always
Every calculator on SiteCals is free to use, with no account required. We keep the lights on through advertising, which lets us keep the tools open to everyone — from first-time DIYers to seasoned pros.
Have a suggestion for a new calculator, spotted an error, or just want to say hello? Reach out through our Contact page — we read every message.