Pregnancy & Baby
Pregnancy week and day calculator from the last menstrual period (LMP), trimester lookup, and a due-date estimator. Informational only — not medical advice.
Gestational age is conventionally counted from the first day of the last menstrual period (LMP), not from conception. A "full-term" pregnancy is 40 weeks (280 days) from LMP. The tools below convert between weeks-and-days and total days, and estimate the due date using Naegele's rule.
Disclaimer: these tools are informational only and are not medical advice. For clinically reliable dating, consult a healthcare professional.