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Pregnancy Due Date Formula:
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The Pregnancy Calculator estimates your due date based on your last menstrual period (LMP) using the standard formula of LMP + 280 days. This provides an estimated due date (EDD) for pregnancy planning and monitoring.
The calculator uses the pregnancy due date formula:
Where:
Explanation: The calculation assumes a regular 28-day menstrual cycle and adds 280 days (40 weeks) to the first day of your last menstrual period.
Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, planning for delivery, and ensuring both maternal and fetal health throughout pregnancy.
Tips: Enter the first day of your last menstrual period accurately. You can also enter your name for personalized results. The calculator will show your estimated due date and current pregnancy status.
Q1: How accurate is this due date calculation?
A: This method is the standard clinical approach, but only about 5% of babies are born exactly on their due date. Most births occur within 2 weeks before or after the estimated date.
Q2: What if my menstrual cycle is irregular?
A: For irregular cycles, an ultrasound dating in early pregnancy (first trimester) provides a more accurate due date estimation.
Q3: Why 280 days instead of 9 months?
A: Pregnancy is calculated as 40 weeks from LMP, which equals 280 days. This differs from calendar months due to varying month lengths.
Q4: When should I confirm with a healthcare provider?
A: Always confirm your due date with a healthcare provider, who may adjust it based on ultrasound measurements and clinical assessment.
Q5: Can I use this for pregnancy planning?
A: Yes, this calculator is useful for planning purposes, but always consult with healthcare professionals for medical decisions.