1. What is Expect Due Date?

The Expect Due Date (estimated due date) is calculated by adding 280 days (40 weeks) to the first day of the Last Menstrual Period (LMP). This is the standard method used by healthcare providers to estimate when a baby is likely to be born.

2. How Does the Calculator Work?

The calculator uses the standard due date calculation:

Where:

• \( \text{LMP} \) — First day of Last Menstrual Period
• \( 280 \text{ days} \) — Equivalent to 40 weeks of pregnancy

Explanation: This calculation is based on the assumption of a 28-day menstrual cycle and ovulation occurring on day 14. The due date represents the end of 40 weeks of gestation.

3. Importance of Due Date Calculation

Details: Accurate due date calculation is crucial 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 ensure the date is accurate 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 on their exact due date. Most births occur within two weeks before or after the calculated date.

Q2: What if I don't know my LMP?
A: If you're unsure of your LMP, an ultrasound in early pregnancy can provide a more accurate due date estimation based on fetal measurements.

Q3: Does this work for irregular cycles?
A: For women with irregular menstrual cycles, the LMP method may be less accurate. An early ultrasound is recommended for better due date estimation.

Q4: Why 280 days specifically?
A: 280 days represents 40 weeks of pregnancy, which is the standard duration used in obstetrics from the first day of the last menstrual period.

Q5: Can the due date change during pregnancy?
A: Yes, healthcare providers may adjust the due date based on early ultrasound measurements, especially if there's a significant difference from the LMP-based calculation.