Terms of Use

Professional Disclaimer

The calculators on this site are aids for preliminary design, checking, and education. They are not a substitute for the judgment of a qualified, licensed engineer, and using them does not create any professional or engineer-of-record relationship between you and us.

Results must be independently verified against the governing codes, standards, and project-specific requirements that apply to your work before being used in any final design, construction document, or safety-related decision. Codes differ between jurisdictions and editions; a calculator that references one standard may not satisfy the one that governs your project.

Use of the Calculators

You may use the calculators for any lawful personal or commercial purpose, including client work. Each tool documents the formulas and standards it implements, and you are responsible for confirming that those assumptions match your situation before relying on a result.

No Warranty

The site and all calculators are provided “as is” and “as available”, without warranty of any kind, express or implied — including, without limitation, warranties of accuracy, merchantability, fitness for a particular purpose, and non-infringement. We work to keep the calculations correct and test them against published worked examples, but we do not warrant that any result is error-free or that the site will be uninterrupted.

Limitation of Liability

To the maximum extent permitted by law, we are not liable for any direct, indirect, incidental, consequential, or special damages arising from your use of, or inability to use, this site or its results — including damages resulting from designs, estimates, or decisions based on calculator output. Your sole remedy for dissatisfaction with the site is to stop using it.

Intellectual Property

The site’s design, text, and code are our property or used under license. The engineering formulas themselves are public knowledge drawn from published standards and references, which each tool cites. You may quote or reference results and page content with attribution; you may not republish substantial parts of the site or present them as your own service.

Acceptable Use

You agree not to disrupt or overload the site, attempt to gain unauthorized access to any part of it, scrape it at abusive volume, or use it to develop a directly competing copy of its content. Automated access for reasonable research or archival purposes is fine.

Advertising & Third-Party Links

The site is supported by advertising served by Google AdSense; how ad cookies work and how to opt out is described in the privacy policy. Pages may link to external standards bodies, references, and vendors. We do not control and are not responsible for third-party sites or the products advertised.

Changes to These Terms

We may revise these terms as the site evolves; the date at the top reflects the latest revision. Continued use of the site after a change constitutes acceptance of the revised terms.