Gestational Age Calculator — LMP and Due Date

Calculates gestational age in weeks and days from the last menstrual period (LMP) date, or from the date of conception (IVF/known ovulation). Also calculates the estimated due date (EDD) using Naegele's rule (LMP + 280 days). Gestational age is one of the most fundamental obstetric calculations for obstetric risk stratification, fetal growth assessment, and timing of antenatal interventions.