Last updated: 2 October 2026
Educational quick checks
CivilKits provides calculators, reference notes, and worked explanations for educational and preliminary use. A result is not a structural design, construction instruction, professional opinion, certification, code-compliance statement, or approval for a real project.
Your professional responsibility
You are responsible for verifying all inputs, units, assumptions, geometry, loading, material properties, design parameters and calculation results. Obtain an independent check by a suitably qualified engineer before using results in design, construction, procurement or any other safety-critical purpose. Do not use a passing indicator as permission to proceed with work.
Applicable standards and National Annexes
CivilKits is primarily intended for Hong Kong engineering users, but a tool may use a declared Eurocode subset or a general engineering equation rather than a Hong Kong code. Select the governing standard for the project, its edition, amendments, National Annex and design situation. Confirm statutory requirements, authority requirements and project specifications separately. Do not assume that a Eurocode example is accepted for a Hong Kong submission, or that a CivilKits default is a nationally required value.
No professional appointment
Using this website, printing a result or sending a correction enquiry does not by itself create an engineer–client relationship or a professional advisory appointment. CivilKits does not undertake project-specific design, checking, certification, supervision or submission services through these public tools. Obtain those services from an appropriately appointed and qualified professional.
Limits of simplified models
Engineering outcomes depend on loading, combinations, boundary conditions, geometry, material behaviour, ground conditions, durability, detailing, construction sequence, national parameters, and other project-specific factors. CivilKits tools intentionally simplify many of these matters and may not cover the governing case.
Software can contain coding, numerical, rounding, unit-conversion or presentation errors. Input-range checks and regression tests do not establish accuracy for every case. Some tools contain fixed coefficients and example reset values; review the displayed calculation basis and defaults and use an independently verified method if the model is unsuitable. An omitted or “not checked” item is outstanding design work, not a pass.
Spreadsheet-derived methods and code references
A calculation method may be informed by a reference spreadsheet or worked example. This does not certify that the source or its adaptation is correct, current, complete or suitable for your project. Member-specific assumptions, hard-coded values, mixed code editions and missing checks must not be treated as approved design practice. A displayed clause reference or “within check” result is not a code-compliance certificate. Independently verify the governing published standard, National Annex, formulas, units and all omitted checks.
No warranty
The site is provided on an “as available” basis. CivilKits aims to publish clear formulas and verification examples but does not warrant that any content is error-free, complete, continuously available, or suitable for a particular purpose.
Liability
Only to the extent lawful and reasonable in the circumstances, CivilKits seeks to exclude liability for indirect or consequential loss, loss of profits, loss of business opportunity or loss of data arising from use of this free website. This provision is not intended to exclude every form of loss or to impose an arbitrary financial cap on liability.
Nothing in these terms excludes or restricts liability for death or personal injury resulting from negligence, fraud or fraudulent misrepresentation, or any other liability or statutory right that cannot lawfully be excluded or restricted. Any exclusion or restriction is subject to applicable Hong Kong law, including the Control of Exemption Clauses Ordinance (Cap. 71) and any applicable requirement of reasonableness. A user's awareness of these terms is not, by itself, acceptance of every engineering risk.
A disclaimer is one risk-control measure, alongside clear assumptions, software checking, independent verification and professional review; it is not a guarantee of freedom from legal liability. The enforceability of any provision depends on the law and circumstances; these terms have not been represented as approved by a Hong Kong lawyer.
External links and advertising
Links and advertisements may lead to third-party services. Their inclusion does not mean CivilKits approves a product for engineering use. Review the provider, specification, suitability, and terms independently.
Acceptable use
Do not misuse the site, attempt to disrupt it, bypass security controls, scrape it in a way that degrades service, or present CivilKits output as professional certification.
Corrections and changes
Tools, reference content and these terms may change. The date above identifies this terms revision, not the date of every calculator or standard. The calculator transparency panel shows a calculation-implementation identifier. Record the identifier, calculation date, inputs, results, assumptions and the selected standard/Annex when retaining a check; a website link alone is not a durable calculation record. Re-check important results after a software or code change. No promise is made to notify each previous visitor personally.
Report a suspected error to hello@civilkits.com with the tool, implementation identifier, inputs, observed result and independently expected result or source. Do not send confidential project information. A correction response is not project-specific engineering advice.
Governing law and legal review
These terms are governed by the laws of the Hong Kong Special Administrative Region. Subject to any mandatory law or jurisdiction right that cannot be displaced, disputes concerning these terms may be brought before the courts of Hong Kong. Nothing here removes a visitor's mandatory statutory protections.
The operator should obtain Hong Kong legal review of these terms, their incorporation into the website, the operator's legal identity and any insurance arrangements. This page does not claim that legal review has occurred.