Effective Date: November 6, 2026 • Status: Draft, needs legal review

1. Acceptance of Terms

By accessing and using Arch Calculator ("we", "us", or "our"), you agree to comply with and be bound by these Terms of Service. If you do not agree to these terms, please do not use our calculation tools.

2. Nature of the Calculation Tools

Arch Calculator provides mathematical modeling tools intended for drafting assistance, carpentry templating, estimation, and educational purposes. While all formulas are based on established geometric theorems, jobsite variations, material tolerances, and structural load conditions vary.

Engineering & Structural Disclaimer: This calculator provides geometric layout calculations and does not perform certified structural engineering, wind load calculations, or seismic analysis. For load-bearing brick, stone, heavy timber, culverts under public roadways, falsework shoring, or concrete arches, always consult a licensed Professional Engineer (PE) or local building official.

3. Intellectual Property

All software code, visual SVG diagrams, written tutorials, and user interface designs are protected by copyright and intellectual property laws. You may use generated calculations and coordinate tables for personal and commercial construction projects freely.

4. Limitation of Liability

In no event shall Arch Calculator be held liable for any direct, indirect, incidental, or consequential damages resulting from the use or inability to use the calculations, layouts, or data generated on this website.