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), using the 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 duration of pregnancy (40 weeks)

Explanation: This calculation assumes a regular 28-day menstrual cycle with ovulation occurring on day 14. The calculator also shows current gestational age in weeks and days.

3. Importance of Due Date Calculation

Details: Knowing your estimated due date helps in prenatal care planning, monitoring fetal development, and identifying potential preterm or post-term pregnancies.

4. Using the Calculator

Tips: Enter the first day of your last menstrual period (LMP) in the format YYYY-MM-DD. The calculator will display your estimated due date and current gestational age.

5. Frequently Asked Questions (FAQ)

Q1: How accurate is this calculator?
A: It provides a general estimate. 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: For cycles longer or shorter than 28 days, adjustments may be needed. Consult your healthcare provider for a more accurate estimate.

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

Q4: What are the trimesters of pregnancy?
A: First trimester: weeks 1-12, Second trimester: weeks 13-28, Third trimester: weeks 29-40.

Q5: What if I don't know my LMP?
A: If you don't know your LMP, an ultrasound can estimate gestational age based on fetal measurements.