Pregnancy Calculation Formula:
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The Due Date Pregnancy Calculator estimates your expected delivery date and current pregnancy week based on your last menstrual period. It provides week-by-week tracking with developmental information and images.
The calculator uses standard pregnancy calculation formulas:
Where:
Explanation: Pregnancy is calculated from the first day of your last menstrual period, with a standard gestation period of 280 days (40 weeks).
Details: Tracking pregnancy weeks helps monitor fetal development, schedule prenatal appointments, prepare for delivery, and understand what developmental milestones to expect each week.
Tips: Enter the first day of your last menstrual period and the current date. The calculator will determine your estimated due date and current pregnancy week for week-by-week tracking.
Q1: How accurate is the estimated due date?
A: The EDD is an estimate - only about 5% of babies are born exactly on their due date. Most births occur within two weeks before or after the estimated date.
Q2: What if I don't know my LMP?
A: If you're unsure of your LMP, an ultrasound in early pregnancy can provide a more accurate due date estimation based on fetal measurements.
Q3: Why is pregnancy calculated from LMP instead of conception?
A: LMP is used because it's typically easier to recall than the exact conception date, and it provides a standardized method for healthcare providers.
Q4: How does week-by-week tracking help?
A: Weekly tracking helps you understand fetal development, prepare for physical changes, and know what to discuss with your healthcare provider at each stage.
Q5: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust your due date based on ultrasound measurements, especially if there's a significant difference from the LMP-based calculation.