Due Date Calculator
Enter the first day of your last period and we will estimate your due date, how many weeks pregnant you are, and your trimester (which third of pregnancy you are in). This is an estimate, your doctor's scan is more accurate.
Your estimated due date
Educational, not medical advice. This uses the standard method (last period plus 280 days, adjusted for your cycle length). Your dating scan is the most accurate. It runs in your browser and stores nothing.
When to see a doctor
Book your first antenatal appointment (your first pregnancy check-up) as early as you can. See a doctor straight away for bleeding, severe pain, a high fever, severe vomiting, or if you are worried about your baby's movements later in pregnancy. A calculator is not a check-up.
Go further
The First Pregnancy Plan
A community for all pregnant women, week-by-week support, and a midwife or doctor to ask.
See the program →