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Hindi EDD = LMP + 280 days
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The Pregnancy Due Date Calculator estimates the expected delivery date based on the last menstrual period using Naegele's rule. It calculates EDD by adding 280 days (40 weeks) to the first day of the last menstrual period.
The calculator uses the standard obstetric formula:
Where:
Explanation: This calculation assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The due date represents the end of 40 weeks of pregnancy.
Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, planning delivery, and identifying potential pregnancy complications. It helps healthcare providers track appropriate gestational milestones.
Tips: Enter the first day of your last menstrual period in the date field. Ensure the date is accurate for the most precise due date calculation. The calculator will also show your current weeks of pregnancy.
Q1: How accurate is this due date calculation?
A: This method is accurate for women with regular 28-day cycles. Only about 5% of babies are born exactly on their due date, with most deliveries occurring within 2 weeks before or after.
Q2: What if my menstrual cycle is longer or shorter than 28 days?
A: For irregular cycles, the calculation may need adjustment. Ultrasound dating in early pregnancy often provides more accurate dating for women with irregular cycles.
Q3: When is the best time to calculate my due date?
A: The calculation is most accurate when done early in pregnancy. First-trimester ultrasound (before 14 weeks) provides the most reliable due date estimation.
Q4: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements, especially if there's a significant difference from LMP-based calculation.
Q5: What is the significance of 280 days?
A: 280 days represents 40 weeks of gestation, which is the standard duration used in obstetrics for calculating due dates from the last menstrual period.