1. What is the Due Date Calculator?

The pregnancy due date calculator estimates the expected delivery date based on the first day of your last menstrual period (LMP). This follows Naegele's rule which assumes a 280-day (40-week) pregnancy from the LMP.

2. How Does the Calculator Work?

The calculator uses the standard formula:

Where:

• LMP — First day of last menstrual period
• 280 days — Equivalent to 40 weeks gestation

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 in monitoring fetal development, scheduling prenatal tests, and preparing for delivery. Only about 5% of women deliver on their exact due date.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period. The calculator will show your estimated due date and current pregnancy progress.

5. Frequently Asked Questions (FAQ)

Q1: What if my cycle isn't 28 days?
A: The calculation may need adjustment. For longer cycles, add the extra days to the due date. Your healthcare provider can help adjust.

Q2: How accurate is this calculator?
A: It provides a general estimate. Ultrasound dating in the first trimester is more accurate.

Q3: What if I don't know my LMP?
A: An early ultrasound can help estimate your due date based on fetal measurements.

Q4: What's considered full term?
A: Between 37 weeks and 41 weeks 6 days. Babies born before 37 weeks are preterm.

Q5: Can the due date change?
A: Yes, especially if early ultrasound measurements differ significantly from LMP-based estimates.