What Is CalcBuild?
CalcBuild is a free suite of 594+ construction calculators built for contractors, builders, remodelers, and DIY homeowners. Every calculator uses real industry-standard formulas — not generic math — so you get accurate, job-ready answers instantly.
Why We Built This
Construction professionals waste time doing material takeoffs by hand or searching through code books for span tables. We built CalcBuild to put every calculation a builder needs into one fast, free, mobile-friendly tool — no app download required.
Our Standards
Every formula is sourced from real building codes and industry references:
- IRC — International Residential Code (stair rise/run, joist spans, footing depths, egress)
- NEC — National Electrical Code (wire sizing, circuit loads, panel sizing, GFCI requirements)
- ACI 211/318/360R — American Concrete Institute (mix design, rebar spacing, slab thickness)
- ASTM — Testing standards for materials (concrete strength, lumber grades)
- NFPA 72 — Fire alarm and detection spacing
- UPC/IPC — Plumbing codes (fixture units, drain pipe sizing)
- ACCA Manual J/D/S — HVAC load calculations
- ENERGY STAR — Insulation R-values, window U-factors
What We Cover
594+ calculators across every construction trade:
- Concrete & Masonry — slabs, footings, walls, piers, blocks, brick, stone veneer
- Framing & Structural — studs, joists, rafters, beams, trusses, headers, LVL
- Roofing — shingles, metal panels, underlayment, ventilation, flashing, trusses
- Electrical — wire sizing, circuits, outlets, panels, GFCI, EV chargers, lighting
- Plumbing — PEX, copper, drain pipe, water heater, septic, well pumps
- HVAC — BTU sizing, duct work, mini-splits, radiant floor, whole house fans
- Flooring — tile, LVP, hardwood, laminate, carpet, self-leveling
- Paint & Coatings — interior, exterior, trim, deck stain, primer, ceiling
- Outdoor — decks, fences, patios, pergolas, pools, retaining walls, irrigation
- Cost Estimators — remodel budgets, contractor markup, ROI, permits, loans
- Converters — feet/meters, cubic yards, tons, pitch/degrees, and 40+ more
Free Forever
CalcBuild is 100% free with no account required. We're ad-supported so we can keep building more tools for the trades. Bookmark us and use us on every job.
Contact
Questions or suggestions? Email us at hello@calcbuild.site