Pregnancy Due Date Calculator
Calculate your estimated due date from last menstrual period or conception date. Free pregnancy due date calculator with milestone dates.
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Frequently asked questions
How is a due date calculated?
Using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period. If using conception date, add 266 days (38 weeks).
How accurate is the due date calculator?
Only 4% of babies are born on their exact due date. Most births occur within 2 weeks before or after. The due date is an estimate — actual delivery depends on many factors.
What week is considered full term?
Full term is 39–40 weeks. Early term is 37–38 weeks. Late term is 41 weeks. Post term is 42+ weeks. Premature is before 37 weeks.
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