Pregnancy Due Date Calculator

Estimated due date from last menstrual period (Naegele's rule, 40 weeks). For information only — not medical advice.

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Pregnancy Due Date Calculator

Naegele's rule — last menstrual period + 280 days.

First day of last menstrual period

For information only. Naegele's rule assumes a 28-day cycle and ovulation on day 14. Ultrasound dating is more accurate. Consult your obstetrician for medical care.