Site information Terms
Terms of Use
Read the educational-use terms, accuracy limits, acceptable-use rules, third-party source notice, and responsibility boundaries for this website.
Last reviewed July 16, 2026
These Terms of Use apply to the Proportion Calculator website. By using the site, you agree to use its calculators and content responsibly and to verify important results independently. If you do not agree with these terms, do not use the site.
Educational and Informational Use
The calculators, explanations, examples, and source links are provided for education and general information. They do not constitute medical, legal, financial, engineering, research-compliance, or other professional advice. They also do not replace an instructor’s requirements, a study protocol, or review by a qualified statistician or subject-matter professional.
You are responsible for selecting an appropriate method, entering the correct values and units, checking the assumptions, and deciding whether a result is suitable for its intended use. Do not use the site as the only basis for a high-consequence decision.
Accuracy and Availability
The site is designed to show its working and is tested against representative cases, but no calculator or explanation is guaranteed to be error-free, complete, continuously available, or suitable for every purpose. Results can be affected by incorrect inputs, unsupported notation, rounding, browser behavior, method assumptions, or a study design that cannot be evaluated from summary numbers.
The site is provided on an “as is” and “as available” basis to the extent permitted by applicable law. You assume responsibility for independently checking any result before relying on it. Suspected errors should be reported under the Corrections Policy.
Acceptable Use
You may use the public calculators for ordinary personal, educational, and internal business tasks, and you may link to public pages. You may not attempt to disrupt the service, bypass security controls, send abusive automated traffic, introduce malicious code, falsely imply endorsement, or present a result as a guarantee made by Proportion Calculator.
Site Content and Third-Party Materials
Unless a page says otherwise, the site’s original text, design, and software may not be republished as a copied or misleading substitute for the site. Short quotations and links may be used where allowed by applicable law and with accurate attribution. Fonts, research papers, textbooks, standards, and other third-party materials remain subject to their respective rights and licenses.
External links are provided to identify sources or useful context. Proportion Calculator does not control those sites and does not claim affiliation with or endorsement by their operators.
Changes and Contact
The site, its methods, and these terms may be updated when functionality or practices change. A review date is changed only when the terms are actually reviewed. The Privacy Policy describes current data practices. Questions can be sent to [email protected].