Health & Fitness
Pregnancy Due Date Calculator
Enter the first day of your last period to estimate your due date, current week and trimester dates.
For information only. Results are estimates and are not medical advice. Please talk to a doctor or qualified professional about your own health.
About the Pregnancy Due Date Calculator
This uses Naegele’s rule: due date = first day of last period + 280 days, adjusted if your cycle is longer or shorter than 28 days.
Only about 5% of babies arrive on the exact due date. Your doctor will confirm dating with an ultrasound.
Frequently asked questions
How accurate is a due date?
It is an estimate. Most babies are born between 37 and 42 weeks.
When is the first scan?
Many doctors schedule a dating scan around 8–12 weeks. Follow your own doctor’s plan.