Conception CalculatorPermitted Personal Use of Pregnancy Date Calculators
You may use the website for personal calendar estimation, general education, and testing with non-sensitive sample dates. You may link to public pages and discuss the documented formulas with appropriate attribution.
You may not present calculator output as a diagnosis, official medical record, guaranteed fertility or delivery prediction, or legally valid paternity conclusion. Do not use the website to impersonate a healthcare service or misrepresent the source and meaning of a result.
Responsibility for Verifying Pregnancy and Fertility Dates
You are responsible for checking that an input uses the correct date type, such as the first day rather than last day of a menstrual period, the gestational age reported on the scan date, or the embryo age documented for transfer. The website cannot know whether an input is accurate or clinically appropriate.
Discuss medical decisions, symptoms, conflicting dates, and treatment records with a qualified professional. The care team's documented due date and instructions take priority over a result from this website.
Pregnancy Calculator Accuracy and Interpretation Limits
The formulas produce estimates from the information entered. Natural variation in ovulation, fertilization, implantation, pregnancy length, and cycle timing means a mathematically correct result may not identify what happened in an individual pregnancy.
The calculation methodology describes the offsets, validation rules, and assumptions. The medical disclaimer explains uses that fall outside the purpose of the site.
Website Availability, Errors and External Information Sources
The website is provided as available without a guarantee that every result, explanation, route, or external source will always be complete, current, uninterrupted, secure, or error-free. Browser changes, hosting incidents, network failures, or software defects may temporarily affect access or behavior.
External links are supplied so users can inspect relevant public guidance. ConceptionCalculator.org does not control third-party availability, policies, or later content changes and is not responsible for services offered by those sites.
Prohibited Misuse of Calculator Pages and Services
Do not interfere with website operation, attempt unauthorized access, distribute malicious code, overwhelm the service with automated requests, or use the contact address for harassment, spam, or unlawful activity. Do not collect information about other users through the site.
Automated access must respect published technical controls and must not degrade access for people using the calculators. Public page availability does not grant ownership of the site's original design, explanatory text, or software.
Changes to Pregnancy Calculator Formulas and These Terms
Formulas, validation limits, sources, content, features, and page availability may change when evidence is reviewed, errors are corrected, or the application is improved. A changed result should be checked against the current methodology and a qualified care record.
These terms may also be revised to reflect website behavior or operational requirements. The review date at the top identifies the version currently presented. Continued use after an update is subject to the current terms.