Contact & About Us
Last updated: October 2026
About VitaminDcalc
VitaminDcalc (vitamindcalc.com) is an independent, science-based web application created to help people understand the relationship between solar geometry, atmospheric UV radiation, and cutaneous vitamin D synthesis. Our goal is to promote safe, sensible, and burn-free sun awareness.
Scientific Grounding
Our calculations are grounded in published photobiological and atmospheric science, including the CIE standard erythema action spectrum (ISO 17166 / CIE S 007), World Health Organization Global Solar UV Index standards, and peer-reviewed research on minimal erythemal dose (MED) and vitamin D synthesis.
How the calculator works · Guides & Articles
Independent Project & Editorial Policy
VitaminDcalc is an independent educational software project created to make published photobiology and solar-geometry formulas accessible in a clear, interactive format. We are not a medical clinic, hospital, laboratory, or supplement manufacturer, and we do not sell health products.
Every equation, parameter, and educational guide on this site summarizes publicly available, peer-reviewed literature — including standards from the World Health Organization (WHO), the International Commission on Illumination (ISO/CIE), and studies indexed in PubMed — with direct links to the primary sources so readers and healthcare professionals can verify every reference independently. When new research or user feedback identifies an improvement, the model and guides are updated and the revision date is recorded on the page.
Get in Touch
We welcome questions, scientific feedback, bug reports, translation suggestions, and partnership inquiries. You can reach our team directly at: