Pregnancy Due Date Calculator
Find your estimated due date and how far along you are, from your last period, conception date or IVF transfer.
Frequently asked questions
How is the due date calculated?
By adding 280 days (40 weeks) to the first day of your last period, adjusted for cycle length (Naegele's rule).
How accurate is it?
It's an estimate; most babies arrive within two weeks either side. An early ultrasound gives the most accurate date.