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Due Date Calculation:
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This calculator estimates your due date when you're 8 weeks pregnant. It adds 224 days (280 days full term minus 56 days for 8 weeks) to your current date to project when your baby is likely to arrive.
The calculator uses the following simple formula:
Where:
Explanation: Pregnancy is typically calculated as 280 days (40 weeks) from the first day of your last menstrual period (LMP). At 8 weeks pregnant, you subtract those 8 weeks (56 days) from the total to get your due date.
Details: Only about 5% of women deliver on their exact due date. Most births occur within two weeks before or after the estimated date. This calculator provides an estimate based on standard pregnancy calculations.
Tips: Enter the current date when you're exactly 8 weeks pregnant. For best results, this should be based on an ultrasound measurement or confirmed by your healthcare provider.
Q1: How accurate is this due date calculation?
A: This provides a standard estimate, but your healthcare provider may adjust it based on ultrasound measurements, especially if they differ significantly from LMP-based calculations.
Q2: What if my cycle isn't 28 days?
A: The standard calculation assumes a 28-day cycle. If your cycles are significantly longer or irregular, your provider may adjust your due date.
Q3: Can the due date change later in pregnancy?
A: Yes, early ultrasound (before 13 weeks) is most accurate for dating. Later ultrasounds are less reliable for changing established due dates.
Q4: What percentage of babies are born on their due date?
A: Only about 5%. Most are born within two weeks before or after.
Q5: Does this work for IVF pregnancies?
A: For IVF, the calculation is based on the embryo transfer date plus 266 days (or 263 for day-3 embryos).