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Pregnancy Due Date Calculator
Calculate your estimated due date and key pregnancy milestones from your last menstrual period.
About This Calculator
Naegele's rule calculates due date as LMP + 280 days (40 weeks). First trimester: weeks 1–13. Second: 14–27. Third: 28–40. Key milestones: heartbeat detectable ~6 weeks, anatomy scan ~20 weeks, viability ~24 weeks.