Pregnancy Due Date Calculator
Estimate your due date from your last period and track your current pregnancy week and trimester. Free, private, nothing is uploaded.
ESTIMATED DUE DATE
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Frequently Asked Questions
- How is the due date calculated?
- Using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period. It assumes a regular 28-day cycle.
- How accurate is a due date?
- It is an estimate, not a deadline. Only about 4% of babies arrive exactly on their due date, and most births happen within two weeks either side.
- What are the three trimesters?
- The first trimester runs to week 13, the second from week 14 to 27, and the third from week 28 until birth.