Our Editorial Philosophy

We would rather publish fewer, thoroughly researched resources than a large volume of shallow ones. Every article is researched against authoritative medical and scientific sources, with the specific sources used listed directly in that article — see our Editorial Policy. We're transparent about where our current process stands, including where we don't yet have formal credentialed medical review in place — see our Medical Review Policy.

How We Build Our Calculators

Our calculators are built using established, widely-used clinical and conventional methods — for example, the standard obstetric formula for estimating due dates, or commonly cited reference ranges for hCG levels. We explain exactly how each calculator works, and what its limitations are, on our Methodology page.

Our Commitment to Evidence-Based Information

We link directly to the sources behind our content so you can verify claims yourself. We update our content as medical guidance evolves — see our Content Update Policy — and we're upfront about the difference between general educational information and individualized medical advice — see our Medical Disclaimer.