Terms of Service

Accuracy Disclaimer

Formulas, parameters, reference tables and guides are compiled from public authoritative sources (official agencies, industry standards, academic literature) and reviewed periodically, but they do not constitute professional advice. For major decisions involving finance (loans, taxes, investments), health or legal matters, always follow official sources and consult licensed professionals. We accept no liability for any direct or indirect losses arising from reliance on calculation results.

Intellectual Property

The page design, code, guide articles, icons and brand assets (including the YiJianSuan name and logo) are the property of this site and may not be copied, republished or used commercially without written permission.

The underlying formulas are public knowledge; you may freely use calculation results, and you are welcome to embed our tools via the provided embed code (please keep the "Powered by" link).

User Conduct

• Do not use this site for any activity that violates applicable laws or regulations
• Do not scrape content at high frequency with automated tools (degrading service for others)
• Do not attack, inject or otherwise compromise the security of the service
• When embedding our tools, keep the embed code intact — do not remove the brand link

Third-Party Links

We do not control and are not responsible for the accuracy or legality of third-party sites referenced as sources or by embedders. Follow their own terms and privacy policies when visiting.

Limitation of Liability

To the maximum extent permitted by law, we are not liable for lost profits, data loss, reputational harm or other intangible losses arising from use of or inability to use the service. Our aggregate liability (if any) is zero — because the service is entirely free.

Changes to These Terms

These terms may be updated as the service evolves; the last-updated date is shown at the top of this page, and material changes will be announced prominently on the homepage. Continued use of the site constitutes acceptance of the updated terms.

Governing Law

These terms are governed by the laws of the People's Republic of China. Disputes shall first be resolved through friendly negotiation; failing that, they shall be submitted to a competent court where the operator is domiciled.

Contact

For questions, feedback or complaints about these terms, reach us via the contact page (QQ 9277493 / WeChat 13993092173, please note "terms inquiry"), answered within 7 business days.