Medical review board
Every calculation and every clinical statement on this site is checked by a qualified clinician before it is published, and re-checked whenever the guidance changes.
Obstetrician–Gynecologist · Board-certified (ABOG, 1997), FACOG
Retired OB-GYN with nineteen years of clinical practice, trained at The Ohio State University. Read full bio →
How the review works
The calculator is built from published obstetric convention: a due date falls 266 days after conception, adjusted for the age of the embryo at transfer. Our reviewer checks that arithmetic, the gestational milestones derived from it, and the clinical wording of every explanation and answer on the site.
Pages carry the date they were last reviewed. Review confirms that the content is accurate and current; it is not a substitute for advice about your own pregnancy, which should come from your clinic.