1. What is the Due Date Calculation?

The due date calculation estimates when a pregnant woman is likely to give birth based on her last menstrual period (LMP). This is commonly known as Naegele's rule, which adds 280 days (40 weeks) to the first day of the LMP.

2. How Does the Calculator Work?

The calculator uses the standard pregnancy calculation:

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. The actual due date may vary based on individual cycle lengths.

3. Importance of Due Date Estimation

Details: An accurate due date helps healthcare providers monitor fetal development, schedule important prenatal tests, and determine if the pregnancy is progressing normally. It also helps in planning for delivery.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the format YYYY-MM-DD. For best accuracy, you should know your exact LMP 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 the estimated date.

Q2: What if my cycle isn't 28 days?
A: For women with longer cycles, ovulation typically occurs later. Your healthcare provider can adjust the due date based on ultrasound measurements.

Q3: When should I confirm my due date with a doctor?
A: You should schedule your first prenatal visit within the first 8 weeks of pregnancy to confirm the due date with ultrasound.

Q4: Can the due date change during pregnancy?
A: Yes, early ultrasound measurements may lead to adjustment of the due date, especially if there's a significant difference from the LMP-based calculation.

Q5: What if I don't know my LMP?
A: If you don't know your LMP, an early pregnancy ultrasound can provide the most accurate due date estimation.