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Pregnancy Calculator Due Date Wheel:
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The Due Date Wheel Calculator estimates the expected delivery date based on the last menstrual period (LMP) using the standard 280-day pregnancy duration. This method is commonly used in obstetric practice for pregnancy dating.
The calculator uses the standard pregnancy calculation formula:
Where:
Explanation: This calculation is based on Naegele's rule and assumes a 28-day menstrual cycle with ovulation occurring on day 14.
Details: Accurate due date estimation is crucial for proper prenatal care, monitoring fetal development, scheduling important tests, and preparing for delivery.
Tips: Enter the first day of your last menstrual period in the date field. The calculator will automatically compute your estimated due date by adding 280 days (40 weeks).
Q1: How accurate is this due date calculation?
A: This method provides an estimated due date, but only about 5% of women deliver exactly on their due date. Most deliveries occur within 2 weeks before or after the estimated date.
Q2: What if my menstrual cycle is longer or shorter than 28 days?
A: For women with regular cycles different from 28 days, the due date may need adjustment. Consult your healthcare provider for personalized calculation.
Q3: Can ultrasound provide a more accurate due date?
A: Yes, early pregnancy ultrasound (especially first trimester) can provide a more accurate due date estimation than LMP-based calculations.
Q4: Why is 280 days used as the standard pregnancy duration?
A: 280 days (40 weeks) is based on the average gestation period calculated from the first day of the last menstrual period in women with regular 28-day cycles.
Q5: When should I contact my healthcare provider after calculating my due date?
A: Contact your healthcare provider as soon as you suspect pregnancy to begin proper prenatal care and confirm dating through clinical examination.