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When Is Your Baby Due?
Formula
Pregnancy typically lasts about 280 days (40 weeks) from the first day of your last menstrual period. Naegele's rule estimates the due date by adding 280 days to the LMP date.
Only about 5% of babies arrive on their exact due date. Most are born within two weeks before or after. Your healthcare provider may adjust the date based on ultrasound measurements.
Common use cases:
- Tracking pregnancy milestones
- Planning maternity leave
- Preparing for delivery
Frequently Asked Questions
Maria Gonzalez
Registered Dietitian, RD, MPH
Maria is a Registered Dietitian with a Master's in Public Health. She focuses on evidence-based nutrition assessment tools including BMI, calorie calculations, and body composition analysis.
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