Health
Pregnancy Due Date Calculator
Calculate your estimated due date and find out how many weeks pregnant you are based on your last menstrual period.
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Frequently Asked Questions
How is the due date calculated?
The due date is calculated by adding 280 days (40 weeks) to the first day of your last menstrual period (LMP). This is known as Naegele's rule.
What are the trimesters?
First trimester: weeks 1–12. Second trimester: weeks 13–26. Third trimester: weeks 27–40.
How accurate is this calculator?
This calculator gives an estimated due date. Only about 5% of babies are born on their exact due date. Most are born within two weeks before or after.