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Pregnancy Calculation Formula:
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The Pregnancy Week By Week Calendar Calculator helps expectant mothers track their pregnancy progress by calculating the estimated due date and generating a comprehensive week-by-week calendar based on the last menstrual period and current date.
The calculator uses standard pregnancy calculation formulas:
Where:
Explanation: Pregnancy is typically calculated as 40 weeks (280 days) from the first day of the last menstrual period. The calculator generates a complete calendar showing each week's dates and highlights the current week.
Details: Accurate pregnancy tracking helps monitor fetal development, schedule prenatal appointments, prepare for delivery, and understand the various stages of pregnancy. It also assists healthcare providers in monitoring both maternal and fetal health.
Tips: Enter the first day of your last menstrual period and the current date (or any date you want to check). The calculator will display your estimated due date, current pregnancy week, and a complete week-by-week calendar.
Q1: Why is pregnancy calculated from LMP instead of conception?
A: LMP is used because it's easier to track and remember than the exact conception date. Most women know their LMP but not their conception date.
Q2: 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 EDD.
Q3: What if I have irregular periods?
A: For women with irregular periods, an early ultrasound (usually between 8-12 weeks) provides a more accurate due date than LMP-based calculations.
Q4: Can I use this calculator if I know my conception date?
A: This calculator uses LMP. If you know your conception date, add 266 days (38 weeks) to calculate your due date.
Q5: Why are there 40 weeks in pregnancy but only 9 months?
A: Pregnancy months are calculated as lunar months (4 weeks each), so 40 weeks equals 10 lunar months, which is approximately 9 calendar months.