1. What Is The Pregnancy Calculator?

The Pregnancy Calculator estimates the due date of pregnancy based on the last menstrual period (LMP). It uses the standard calculation method of adding 280 days (40 weeks) to the first day of the last menstrual period.

2. How Does The Calculator Work?

The calculator uses the standard pregnancy calculation formula:

Where:

• \( EDD \) — Estimated Due Date
• \( LMP \) — Last Menstrual Period (first day)
• \( 280 \text{ days} \) — Standard pregnancy duration (40 weeks)

Explanation: This calculation is based on Naegele's rule, which assumes a 28-day menstrual cycle and ovulation occurring on day 14.

3. Importance Of Pregnancy Calculation

Details: Accurate due date estimation is crucial for prenatal care planning, monitoring fetal development, scheduling important tests, and preparing for delivery.

4. Using The Calculator

Tips: Enter the first day of your last menstrual period in the date field. The calculator will automatically compute and display your estimated due date. Ensure the date entered is accurate for the most reliable result.

5. Frequently Asked Questions (FAQ)

Q1: How Accurate Is This Calculation?
A: This method is accurate for women with regular 28-day cycles. For irregular cycles, ultrasound dating may be more precise.

Q2: What If I Don't Remember My LMP Exactly?
A: If you're unsure of your LMP, an early pregnancy ultrasound (first trimester) can provide a more accurate due date estimation.

Q3: Why 280 Days Instead Of 9 Months?
A: Pregnancy is calculated as 40 weeks from LMP, which equals 280 days. This accounts for the fact that conception typically occurs about 2 weeks after LMP.

Q4: Can The Due Date Change?
A: Yes, healthcare providers may adjust the due date based on ultrasound measurements, especially if there's a significant difference from LMP-based calculation.

Q5: What Percentage Of Babies Are Born On Their Due Date?
A: Only about 5% of babies are born exactly on their due date. Most births occur within two weeks before or after the estimated due date.