For your pregnancy, our calculator is based on regular 28 day menstrual cycles. An average pregnancy is 280 days from the last menstrual cycle. Obstetricians allow two weeks on either side of the estimated due date and consider a baby on time. Enter the mother's pregnancy information into this calculator and Pregnancy Calendar will provide an estimated conception date, birth due date, and an estimated current fetal age. Great for all those mothers-to-be!
