1. What is Pregnancy Due Date Calculation?

The pregnancy due date calculator estimates the expected delivery date based on the first day of your last menstrual period (LMP). This calculation follows Naegele's rule, which adds 280 days (40 weeks) to the LMP date.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy due date formula:

Where:

• \( LMP \) — First day of last menstrual period
• \( 280\ days \) — Standard pregnancy duration (40 weeks)

Explanation: This calculation assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The due date represents the estimated date when the baby is likely to be born.

3. Importance of Due Date Calculation

Details: Accurate due date calculation is essential for proper prenatal care, monitoring fetal development, scheduling important tests, and preparing for delivery. It helps healthcare providers track pregnancy progress and identify any potential complications.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the date field. Make sure to use the correct date format and select the accurate LMP date for the most precise due date estimation.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is the due date calculation?
A: The due date 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 have irregular periods?
A: If you have irregular menstrual cycles, the LMP method may be less accurate. An early ultrasound can provide a more precise due date estimation.

Q3: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements, which are most accurate in the first trimester.

Q4: What is gestational age vs fetal age?
A: Gestational age is calculated from the LMP, while fetal age (conceptual age) is about two weeks less, calculated from the actual conception date.

Q5: When should I confirm my due date with a doctor?
A: It's recommended to schedule your first prenatal appointment within the first 8 weeks of pregnancy to confirm the due date and begin proper prenatal care.