By using The Useful Site, you agree to use it lawfully and to treat calculator results as information rather than a guarantee.
Using the website
You may use the publicly available calculators and pages for personal, educational and ordinary business reference purposes.
You must not use the website to break the law, interfere with its operation, probe security without permission, overload its systems or attempt to obtain access to parts that are not public.
Calculator results
Results are produced from the values entered and the method implemented on the page. I do not guarantee that every result will be suitable for your circumstances or free from error.
You are responsible for checking important measurements, assumptions, rates, legal requirements and professional guidance before acting on a result.
No professional relationship
Using a health, finance, legal, structural or forensic-science page does not create a doctor-patient, adviser-client, solicitor-client, engineer-client or expert-witness relationship.
Availability
The site may be changed, interrupted, withdrawn or updated without notice. I aim to preserve useful links and calculators, but cannot promise permanent availability of every page.
Intellectual property
The site's original wording, design and code are protected by applicable intellectual-property law. You may link to pages and quote brief passages with fair attribution.
You may not copy substantial parts of the site, republish the calculator collection as your own, remove attribution from copied content or use automated means to reproduce the site at scale without permission.
External sources and links
References and links are provided to help readers check information. External websites are operated by their respective owners, and I am not responsible for their availability or content.
User messages and suggestions
When you suggest a tool or improvement, you give permission for the idea to be considered, adapted and implemented without payment or an obligation to publish it.
Do not submit confidential information, unlawful material or content that you do not have the right to share.
Liability
Nothing in these terms excludes liability that cannot lawfully be excluded. Subject to that, the site is provided for general information, and responsibility is not accepted for losses caused by relying on a result without appropriate checking or advice.
Privacy and cookies
Use of personal data and browser technologies is described in the Privacy Policy and Cookie Policy.
Changes to these terms
These terms may be updated as the website changes. Continued use after an update means the current version applies to that use.
Governing law
These terms are governed by the law of England and Wales. Courts with jurisdiction under applicable consumer and civil law may hear disputes.
Contact
Questions about these terms can be sent through the Contact page.