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EDD Calculation Formula:
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The Due Date Calculator estimates your expected delivery date based on your last menstrual period (LMP). It uses the standard calculation of LMP plus 280 days (40 weeks) to determine your estimated due date (EDD).
The calculator uses the standard pregnancy calculation formula:
Where:
Explanation: This calculation is based on the assumption of a 28-day menstrual cycle and ovulation occurring on day 14. The 280 days represents 40 weeks of pregnancy.
Details: Accurate due date calculation is essential for proper prenatal care, monitoring fetal development, planning for delivery, and identifying potential pregnancy complications. It helps healthcare providers track appropriate milestones throughout the pregnancy.
Tips: Enter the first day of your last menstrual period in the date field. Ensure you use the correct date format and select the accurate first day of your last period for the most precise calculation.
Q1: How accurate is the due date calculation?
A: The calculation provides an estimate. Only about 5% of babies are born on their exact due date. Most births occur within two weeks before or after the estimated due date.
Q2: What if my cycle is longer or shorter than 28 days?
A: If your menstrual cycle is consistently longer or shorter than 28 days, your healthcare provider may adjust your due date accordingly during your first ultrasound.
Q3: When should I confirm my due date with a healthcare provider?
A: It's recommended to schedule your first prenatal appointment within the first 8 weeks of pregnancy to confirm your due date and begin proper prenatal care.
Q4: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust your due date based on early ultrasound measurements, which are most accurate in the first trimester.
Q5: What are the three trimesters of pregnancy?
A: Pregnancy is divided into three trimesters: First trimester (weeks 1-13), Second trimester (weeks 14-27), and Third trimester (weeks 28-40+).