Free tool
When is your baby due?
Enter one date. We’ll work out your due date, how far along you are, and what usually comes next.
How this is calculated
From your last period, we add 280 days (40 weeks), adjusted for your usual cycle length. From conception, we add 266 days. For IVF, we count from the transfer date and embryo age. Only about 1 in 20 babies arrives on the exact due date; most come within two weeks either side.
General information, not medical advice. Your doctor may adjust your due date after an ultrasound scan.