Calculating your due date

A pregnancy is estimated as 40 weeks from the 1st day of your last period. Obviously nobody can predict the exact date that you will give birth (unless they have psychic powers), lots of factors can affect when your baby arrives. Your 12 week dating scan will give you a clearer idea of when your baby is due, but even then most babies don’t put in an appearance on their due date.

Click the calendar to enter the date when your last period began:

Click to enter date.