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Pregnancy Due Date Calculator: Estimate Your Baby's Arrival
Our easy-to-use pregnancy due date calculator helps expectant mothers estimate their delivery date based on several key methods. Calculate your estimated due date (EDD) and learn more about your pregnancy timeline with our comprehensive tool.
Understanding Pregnancy Due Dates
A pregnancy due date, also known as the estimated date of delivery (EDD), is calculated as 40 weeks from the first day of your last menstrual period (LMP). While only about 5% of babies are born exactly on their due date, most deliveries occur within two weeks before or after this date.
How Due Date Calculation Works
The most common method for calculating due date is Naegele's Rule, which adds 280 days (40 weeks) to the first day of your last menstrual period. This calculation assumes a 28-day cycle with ovulation occurring on day 14.
Other Methods for Determining Due Date
Healthcare providers may also use conception date, IVF transfer date, or ultrasound measurements to determine your due date, especially if your menstrual cycles are irregular or if you've undergone fertility treatments.
Why Due Dates Matter
Knowing your estimated due date helps healthcare providers monitor your baby's growth and development, schedule appropriate prenatal tests, and prepare for delivery. It also helps expectant parents plan for their baby's arrival.
How accurate are pregnancy due date calculators?
Due date calculators provide an estimate based on standard calculations. Only about 5% of women deliver exactly on their calculated due date. Most babies are born within two weeks before or after the estimated date.
What if I don't know the date of my last period?
If you're unsure about your LMP, your healthcare provider can estimate your due date using an early ultrasound measurement, which is most accurate when performed in the first trimester.
Can my due date change?
Yes, your due date might be adjusted based on ultrasound measurements, especially if there's a significant difference between the LMP-based calculation and ultrasound findings.
Why is pregnancy calculated from the last period?
Pregnancy is calculated from the first day of your last menstrual period because it's typically easier to pinpoint than conception date. This method adds about two weeks before conception actually occurs.
How does IVF affect due date calculation?
For IVF pregnancies, the due date is typically calculated based on the embryo transfer date. For a 5-day blastocyst transfer, the due date is 266 days from the transfer date.
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