Last updated: November 7, 2026

Using ConsCalc

These terms describe use of buildingcalculator.org, its calculators, interactive layout planners, cut lists and supporting content, published under the ConsCalc Editorial Team name. Please read them before relying on a result, drawing or material schedule. If you do not agree to these terms, do not use the service.

The calculators and planners are currently free to use and do not require a visitor account or payment. Information about personal data and browser storage is set out separately in our Privacy Policy.

Planning estimates, not project approval or order specifications

Calculator and planner results—including 2D elevations, 3D previews, marking schedules, labeled parts lists, 1D/2D cutting plans and exported CSV, SVG or printed build packs—are preliminary geometric estimates based on the values entered and the method described on the relevant page. They are not a supplier quotation, a guaranteed purchase order quantity, a shop drawing, an inspection or confirmation that a proposed construction method is suitable.

ConsCalc does not provide structural engineering, geotechnical assessment, architectural approval, electrical clearance certification or building-code compliance. A volume, weight, board-foot total or piece count cannot establish the strength, stability, fire rating or safety of a project. Obtain qualified professional advice and check local building codes where the work requires it.

Mandatory field verification, nominal sizes and cutting tolerances

You are responsible for choosing the correct tool, entering accurate physical measurements, selecting the right units and verifying all dimensions on the actual job site with a tape measure before purchasing or cutting materials. Actual material requirements frequently differ from theoretical geometry because of:

  • Nominal vs. actual product dimensions: Store trade labels (such as 1×3, 1×4, 2×4 lumber, nominal masonry units or sheet goods) differ from actual dressed or manufactured dimensions. Entering a nominal label instead of the physical face width or thickness will shift layout marks and alter quantities.
  • Out-of-plumb walls, uneven floors and site grading: Real walls, ceilings, skirting boards and subgrades are rarely perfectly plumb, level or square. Never order non-returnable pre-cut exact lengths solely from a digital layout; leave scribing allowance and cut pieces to fit on site.
  • Joinery, saw kerf and waste allowances: 45° mitre cuts require outer long-point lengths that differ from 90° square butt cuts, and stock board yields depend on saw blade kerf, end squaring and natural defects (knots, warp or splits).
  • Bulk material density and compaction: Gravel, sand, mulch, topsoil, concrete and asphalt quantities depend on moisture content, gradation, compaction and subgrade settlement.

Before placing an order or making cuts, confirm actual product dimensions, density, bag yield, pack size, stock lengths, delivery quantities and recommended waste allowance (typically 10% to 15%) with your supplier or installer. Costs calculated from unit prices you enter are arithmetic estimates only and exclude taxes, delivery, fasteners, adhesives, tools and labor.

Accuracy, changes and availability

We aim to make formulas, drawings and assumptions clear, but errors, omissions, browser rendering differences or outdated references can occur. We do not guarantee that every calculation, cutting heuristic or external source is complete, current or suitable for a particular purpose. See Our Methodology for how our tools are explained.

Tools and content may be corrected, changed or temporarily unavailable. Where permitted by applicable law, the website and its tools are provided on an “as is” and “as available” basis without any warranty of uninterrupted or error-free operation.

Permitted use

You may use the calculators and planners for personal or business project planning and use the resulting estimates and printouts in your own work. You may link to our pages and quote short passages with attribution where the law permits.

Do not attempt to gain unauthorised access, interfere with the website, distribute malicious code or impose an unreasonable load on the service. Permission to use a calculator or planner does not grant permission to copy and republish the site's articles, design, illustrations or application code as your own. Any rights provided by applicable law remain unaffected.

Sources, external links and advertising

Links to standards bodies, manufacturers, suppliers and other sources are provided for reference. ConsCalc does not control those websites, their products or their policies. Mentioning a product or linking to a source does not imply a partnership, endorsement or professional certification.

The site may display advertising when the planned advertising service is activated. An advertisement is not a recommendation from the ConsCalc Editorial Team. Transactions with a supplier, contractor or advertiser are solely between you and that provider.

Limitation of responsibility and legal rights

To the maximum extent permitted by applicable law, ConsCalc and its publishers shall not be liable for any direct, indirect, incidental, consequential or special losses or damages arising from reliance on a calculator estimate, planner drawing or cut list without independent on-site measurement, product verification and professional assessment. This includes, without limitation, purchasing decisions, material shortages, excess materials, restocking fees, miscut lumber or panels, rework labor costs or project delays caused by site conditions or product dimensions that differ from entered assumptions.

Nothing in these terms excludes liability that cannot lawfully be excluded or removes mandatory consumer or other statutory rights. The limitations above apply only to the extent permitted in the relevant jurisdiction.

Changes and contact

These terms may be updated as the website and its tools evolve. The date at the top identifies the current revision. For questions, permissions or error reports, contact contact@buildingcalculator.org or visit our contact page.