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Frequently Asked Questions
How is the due date calculated?
The due date is calculated using Naegele's rule: add 280 days (40 weeks) to the first day of your last menstrual period. This assumes a 28-day cycle and ovulation on day 14.
What if my cycle is not 28 days?
This calculator assumes a standard 28-day cycle. If your cycle is different, the due date may vary. Consult your healthcare provider for a more accurate estimate based on your cycle length.
How accurate is this calculation?
Only about 5% of babies are born on their exact due date. Most babies are born within 2 weeks before or after the due date. Ultrasound dating is more accurate for determining gestational age.
What if I don't know my last menstrual period?
If you don't know your LMP, your healthcare provider can estimate your due date using ultrasound measurements, especially in the first trimester when measurements are most accurate.
When should I see a healthcare provider?
Schedule your first prenatal appointment as soon as you suspect you're pregnant. Early prenatal care is important for monitoring your health and your baby's development.
Important Disclaimer
For informational purposes only: This calculator provides estimates and should not be considered as professional advice.
Medical disclaimer: Results are for reference only and not a substitute for professional medical advice. Consult healthcare providers for medical decisions and personalized health assessments.
Accuracy: While we strive for accuracy, users should verify results independently for critical decisions.