Sources and References
At TheHealthCalc, we aim to create educational calculators, guides, and health-related explanations using clear language and reliable reference sources. This page provides an overview of the types of sources we may use when preparing or updating content across the website.
TheHealthCalc content is for general educational purposes only. Our calculators provide estimates and should not be used as medical advice, diagnosis, treatment, or a substitute for guidance from a qualified healthcare professional.
How We Use Sources
We use references to support general explanations, calculator methods, health ranges, safety notes, formulas, and educational context where appropriate.
Depending on the topic, we may refer to public health agencies, clinical organizations, academic resources, medical institutions, professional associations, and scientific databases. Not every source listed on this page is used on every page of the website.
Health and General Wellness
- World Health Organization (WHO)
- Centers for Disease Control and Prevention (CDC)
- National Health Service (NHS)
- MedlinePlus
- Mayo Clinic
Nutrition and Body Measurements
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
- CDC Healthy Weight and Growth
- NHS Eat Well
- MyPlate
- NIH Office of Dietary Supplements
Pregnancy, Fertility, and Reproductive Health
- American College of Obstetricians and Gynecologists (ACOG)
- CDC Pregnancy
- NHS Pregnancy
- March of Dimes
- Office on Women’s Health
Child Growth and Development
- WHO Child Growth Standards
- CDC Growth Charts
- UNICEF
- American Academy of Pediatrics (AAP)
- HealthyChildren.org
Fitness, Exercise, and Physical Activity
- American College of Sports Medicine (ACSM)
- Exercise is Medicine
- Physical Activity Guidelines for Americans
- CDC Physical Activity
- NHS Exercise
Scientific Research and Medical Databases
- PubMed
- National Center for Biotechnology Information (NCBI)
- Google Scholar
- Cochrane Library
- ScienceDirect
Calculator Formulas and Methods
Some calculators use established equations, published formulas, or commonly used estimation methods. When a calculator relies on a specific formula, we aim to explain the method on the relevant calculator page where appropriate.
Calculator results are estimates and may not reflect individual medical history, body composition, pregnancy status, medications, chronic conditions, growth patterns, or other personal factors.
Updates and Review Process
We may update this references page and individual calculator pages when sources change, links become outdated, formulas need clarification, or additional context can improve user understanding.
If you notice an outdated link, unclear source, or possible error, please contact us through our Contact page.
Important Note
The references listed on this page are provided to support transparency and general educational quality. They do not mean that TheHealthCalc provides medical advice or that every page has been reviewed by each organization listed.
Always speak with a qualified healthcare professional for personal medical questions, symptoms, diagnosis, treatment, pregnancy concerns, child health concerns, diet changes, or exercise limitations.
Last updated: March 26, 2026