Editorial & Verification Policy

Last Updated & Verified: November 4, 2026

At Arch Calculator, mathematical accuracy and trade safety are paramount. Because our layout tools and guides inform physical construction, woodworking templates, and masonry projects, we maintain strict editorial standards and an open corrections protocol.

1. Formula Verification & Engineering Standards

Every calculator on this platform is constructed from established mathematical theorems and recognized trade standards:

• Euclidean & Analytic Geometry: Circular arcs are computed via the Intersecting Chords Theorem (R = (W² + 4H²) / 8H). Ellipses utilize true semi-major and semi-minor focal points (c = √(a² − b²)) and Ramanujan perimeter approximations.
• Masonry Standards: Brick voussoir and centering calculators follow Brick Industry Association (BIA) Technical Note 31, mandating odd voussoir totals for centerline keystone placement and ASTM C270 mortar criteria.
• Building Codes: Rough opening and doorway headroom guidelines are cross-referenced with International Residential Code (IRC Section R305).
• Civil Hydraulics: Culvert flow calculations utilize Manning's formula for open-channel gravity flow conforming to AASHTO M36/M196 specifications.

2. AI Transparency & Content Authorship

We believe in complete transparency regarding the use of technology:

• Scaffolding & Tooling: Automated tools and generative AI assist in code linting, accessibility checks, and site optimization.
• Verification: No mathematical formula, engineering calculation, or building code recommendation is published solely based on AI generation. All equations undergo independent algebraic and numerical validation.
• Authorship: Content produced collaboratively by our technical maintainers is transparently attributed to the Arch Calculator Editorial Team. We do not invent fictional credentials or pseudonymous experts.

3. Scope & Professional Disclaimers

Our calculators are intended for drafting assistance, layout templating, material estimation, and educational reference. They are not a substitute for licensed engineering design. For structural load-bearing arches, foundation footings, highway culverts, and high-temperature fire masonry, calculations must be reviewed and stamped by a licensed Professional Engineer (PE) or registered architect.

4. Errata & Public Corrections Policy

We welcome peer review from carpenters, masons, drafters, engineers, and apprentices. If you discover a typographical error, a formula discrepancy, or an edge-case rounding error, we are committed to fixing it promptly.

To report an error, please email our editorial desk directly at support@archcalculator.com with the subject line "Formula Correction Report". Please include the page URL, the specific inputs used, the observed result, and the expected mathematical value with citations.