1. What is Pregnancy Calculator?

The Pregnancy Calculator estimates the due date and current pregnancy status 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 assumes a regular 28-day menstrual cycle and ovulation occurring on day 14. The 280 days represent 40 weeks of gestation from the first day of the last menstrual period.

3. Importance of Pregnancy Calculation

Details: Accurate due date calculation is essential for proper prenatal care, monitoring fetal development, planning for delivery, and identifying potential pregnancy complications. It helps healthcare providers track appropriate milestones and schedule important tests at the right times.

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 calculation.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation method?
A: This method is accurate for women with regular 28-day cycles. For irregular cycles, ultrasound dating in early pregnancy may be more accurate.

Q2: Why 280 days instead of 9 months?
A: Pregnancy is calculated as 40 weeks from LMP, which equals 280 days. The "9 months" concept is approximate and varies by calendar month length.

Q3: What if I don't know my exact LMP?
A: If you're unsure of your LMP, an early pregnancy ultrasound (before 13 weeks) can provide a reliable due date estimate based on fetal measurements.

Q4: Can the due date change?
A: Yes, healthcare providers may adjust the due date based on early ultrasound findings or if menstrual dates are uncertain.

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 are born within two weeks before or after the estimated date.