Terms of Service

Last updated: January 2025

By accessing and using the Rock Mass Rating Calculator website, you agree to the following terms and conditions. Please read them carefully before using any of the tools or content provided on this site.

Free to Use

The Rock Mass Rating Calculator and all associated tools, guides, and educational content on this website are provided free of charge. You may use the calculator and reference materials for personal, educational, and professional purposes without restriction. No account registration, subscription, or payment is required.

You are welcome to share links to this website with colleagues, students, and professional contacts. However, you may not reproduce, republish, or redistribute the website content in bulk without prior written permission.

No Warranty

This website and all of its tools, content, and materials are provided on an "as is" and "as available" basis without warranties of any kind, whether express or implied. We do not warrant that the calculator will be error-free, uninterrupted, or free from technical issues. While we have made every effort to ensure the rating tables and formulas accurately reflect the Bieniawski 1989 classification system, we make no guarantee of absolute accuracy or completeness.

The website may be updated, modified, or temporarily unavailable at any time without prior notice.

Preliminary Assessment Only

The results generated by the Rock Mass Rating Calculator are intended for preliminary assessment and educational purposes only. The RMR classification output should be treated as one input among many in any geotechnical engineering decision. It does not replace site-specific investigation, laboratory testing, detailed analysis, or the professional judgement of a qualified geotechnical engineer.

Rock mass conditions vary significantly across a site and over time. A single classification value cannot capture all relevant variability. Users are responsible for verifying all inputs and interpreting results in the context of their specific project requirements and local conditions.

Limitation of Liability

To the fullest extent permitted by applicable law, the owners, operators, authors, and contributors of this website shall not be held liable for any direct, indirect, incidental, consequential, or special damages arising from the use of or inability to use this website or its tools. This includes, but is not limited to, damages resulting from engineering decisions, construction outcomes, project delays, or financial losses based in whole or in part on results produced by the calculator.

You use this tool entirely at your own risk. By using the calculator, you acknowledge that you are solely responsible for how you apply the results in practice.

Intellectual Property

The website design, code, original text content, and graphical elements are the intellectual property of the Rock Mass Rating Calculator project. The underlying Rock Mass Rating classification system was developed by Professor Z.T. Bieniawski and is referenced here for educational and professional utility under standard academic citation practice.

All trademarks, service marks, and trade names referenced on this site are the property of their respective owners.

Changes to These Terms

We reserve the right to update or modify these terms at any time. Changes will be posted on this page with a revised date. Continued use of the website after changes are posted constitutes your acceptance of the updated terms.

Contact

If you have questions about these terms, please visit our Contact page.