1. What is the Pregnancy Due Date Calculator?

The Pregnancy Due Date Calculator estimates the expected delivery date based on the first day of your last menstrual period (LMP), adding 280 days (40 weeks) as per the Pampers method.

2. How Does the Calculator Work?

The calculator uses the standard Naegele's rule:

Where:

• LMP — First day of last menstrual period
• 280 days — Standard length of human pregnancy

Explanation: This calculation assumes a regular 28-day menstrual cycle with ovulation occurring on day 14.

3. Importance of Due Date Calculation

Details: Knowing your estimated due date helps with pregnancy planning, monitoring fetal development, and scheduling important prenatal tests at the right times.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period (LMP) in the format MM/DD/YYYY. The calculator will add 280 days (40 weeks) to estimate your due date.

5. Frequently Asked Questions (FAQ)

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

Q2: What if my cycle isn't 28 days?
A: This calculation assumes a 28-day cycle. If your cycle is longer or shorter, your healthcare provider may adjust the due date.

Q3: When will my doctor confirm the due date?
A: An early ultrasound (usually in first trimester) can provide a more accurate due date based on fetal measurements.

Q4: Why 280 days?
A: Pregnancy is typically counted as 40 weeks from LMP, which equals 280 days (including the 2 weeks before conception).

Q5: What are the trimesters based on this due date?
A: 1st trimester: weeks 1-12, 2nd trimester: weeks 13-27, 3rd trimester: week 28 until birth.