Dearbump
Due date calculator

When is your baby due?

Enter the first day of your last period, the date you conceived, or your IVF transfer date. We’ll show your estimated due date and how many weeks pregnant you are today.

Work it out from
How it works

How your due date is worked out

  1. 1From your last periodMost due dates are worked out from the first day of your last period. Pregnancy is counted from that day, so you’re already about 2 weeks ‘pregnant’ when you conceive. If your cycle is longer or shorter than 28 days, the date moves to match.
  2. 2From conceptionIf you know when you conceived, your due date is about 38 weeks after that.
  3. 3From IVFWith IVF the transfer date and the age of the embryo give a precise starting point, so your clinic’s date is usually very close to this one.

A due date is an estimate, not a deadline. Your midwife will confirm it at your dating scan. If you have any bleeding, pain or are worried about anything, contact your GP, midwife or maternity unit.