1. What is Pregnancy Calculator?

The Pregnancy Calculator estimates the due date and current gestational age based on the last menstrual period (LMP). It uses the standard calculation of LMP + 280 days to determine the estimated delivery date.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy calculation formula:

Where:

• \( LMP \) — Last Menstrual Period (start date of last period)
• \( 280 days \) — Standard duration of human pregnancy (40 weeks)

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

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.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period. The calculator will provide your estimated due date and current gestational age in weeks and days.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this due date calculation?
A: This provides an estimate. Only about 5% of women deliver exactly on their due date. Most deliver within 2 weeks before or after.

Q2: What if my cycle is longer or shorter than 28 days?
A: For cycles longer than 28 days, add the extra days to the due date. For shorter cycles, subtract the difference.

Q3: When should I confirm with ultrasound?
A: Early ultrasound (8-12 weeks) provides the most accurate dating. Later ultrasounds are less reliable for dating.

Q4: What is gestational age vs fetal age?
A: Gestational age is calculated from LMP, while fetal age is from conception. Gestational age is typically 2 weeks more than fetal age.

Q5: Can this calculator be used for IVF pregnancies?
A: For IVF pregnancies, use the embryo transfer date + 266 days (or 38 weeks) for a more accurate due date.