1. What is the Due Date Calculation?

The due date calculation estimates the expected date of delivery based on the first day of the last menstrual period (LMP). This method assumes a standard 280-day (40-week) pregnancy duration.

2. How Does the Calculator Work?

The calculator uses the Naegele's rule:

Where:

• LMP — First day of last menstrual period
• 280 days — Standard pregnancy duration (40 weeks)

Explanation: This calculation estimates the delivery date by adding 280 days (40 weeks) to the first day of the last menstrual period.

3. Importance of Due Date Estimation

Details: Accurate due date estimation is crucial for prenatal care planning, monitoring fetal development, and determining the timing of important tests and interventions.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period in the date field. The calculator will estimate your due date by adding 280 days (40 weeks) to this date.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculation?
A: This method is accurate for women with regular 28-day cycles. Ultrasound dating may be more accurate, especially if performed in the first trimester.

Q2: What if my cycle isn't 28 days?
A: For cycles longer or shorter than 28 days, adjustments may be needed. Consult your healthcare provider for a more personalized estimate.

Q3: 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.

Q4: Can this be used if I don't know my LMP?
A: If you don't know your LMP, an ultrasound measurement is the most accurate way to estimate your due date.

Q5: What other methods can estimate due date?
A: Ultrasound measurements, conception date (if known), and IVF transfer date (for assisted reproduction) can also be used to estimate due dates.