Pregnancy Calculator AI is committed to providing educational tools that are grounded in established medical knowledge and widely accepted clinical practices. Our calculators and informational content are developed by researching multiple reputable sources and applying standard calculation methods used in pregnancy and fertility care.
This page outlines the types of references and resources that inform our work.
Types of Sources We Use
Our calculators and educational content are informed by a combination of:
- Peer-reviewed medical literature
- Public health organizations
- Professional medical associations
- Standard obstetric and fertility references
- Clinical guidelines available to the public
We prioritize sources that are widely recognized, evidence-based, and regularly updated.
Public Health & Medical Organizations
We reference guidance and educational material from established organizations, including:
- World Health Organization (WHO)
https://www.who.int - Centers for Disease Control and Prevention (CDC)
https://www.cdc.gov/pregnancy - National Health Service (NHS – UK)
https://www.nhs.uk/pregnancy - American College of Obstetricians and Gynecologists (ACOG)
https://www.acog.org/womens-health - National Institutes of Health (NIH)
https://www.nih.gov
These organizations provide foundational information on pregnancy dating, fertility, reproductive health, and maternal care.
Clinical & Academic References
Calculator logic is informed by commonly accepted clinical methods, including:
- Last menstrual period (LMP)–based pregnancy dating
- Gestational age calculation standards
- Ovulation and fertile window estimation principles
- IVF and IUI timing conventions
- Early pregnancy hormone progression references
These methods are widely discussed in medical textbooks, clinical guidelines, and academic research.
Peer-Reviewed Medical Literature
We review peer-reviewed journal articles and academic publications to understand how pregnancy and fertility calculations are applied in clinical practice. These sources help guide:
- Calculation assumptions
- Reference ranges
- Terminology usage
- Explanation of variability and limitations
Medical literature is used to inform methodology and educational context only.
Ongoing Review & Updates
Medical standards and guidelines evolve over time. We periodically review calculators and reference materials to ensure alignment with current practices.
When new guidance becomes widely accepted, we update tools accordingly.
Transparency & Limitations
While we strive to use accurate and reputable sources, calculators are simplified representations of complex biological processes. Individual medical circumstances vary.
Calculator results should be used for general understanding and discussed with qualified healthcare professionals when medical decisions are involved.
Learn More About Our Standards
You can read more about how content is created and reviewed on our:
Our Approach
Our approach is to combine authoritative external references with clear explanations, helping users better understand pregnancy and fertility concepts while maintaining appropriate medical context and responsibility.